Automotive Acronyms

BAR - Bureau of Automotive Repair [California]

BCM - Battery Conditioning Module (Honda Hybrid)

BCM - Body Control Module

BEV - Battery Electric Vehicle, pure electric vehicle

BLM - Block Learn Memory, Block Learn Mode, or Block Learn Multiplier (i've seen all three) Otherwise known as long term fuel trim. the long term fuel correction in 80's cars. If the ECM finds that the long term average of the INT's (see below for INT - short term fuel trim) is adding fuel (over 128), it ratchets up the BLM's to try and get the average of the INT's back to 128. It stores those values in the volatile memory..... that's most of what the ECM "learns". If the BLM's are above 128, the ECM is responding to what it BELIEVES is a lean condition. IF the BLM's are below 128, its responding to what it BELIEVES is a rich condition. For example, if your fuel pressure is too low, the injectors don't flow the amount of fuel the ECM is expecting, it runs lean, and the O2 feedback elevates the BLM's above 128. If you had a vacuum leak, same result. If you have an MAF sensor and its dirty and reporting less mass air flow than is actually entering the engine, its a lean condition. If you have a speed-density setup, and have modified the intake and exhaust to improve the engine's breathing, but have not had the programming modified with changes to the volumetric efficiency (VE) tables, it would run lean. These are all "TRUE" lean conditions. But sometimes, the O2 sensors give the incorrect feedback, indicating a "FALSE" lean condition. The main examples of this would be 1) faulty O2 sensor(s), 2) misfires, 3) exhaust leaks before the O2 sensors. All of those trick the ECM into thinking the engine is running lean, and it adds a bunch of extra fuel, using the BLM's, that the engine does not need.

BPW - Base Pulse Width in automotive contexts, which refers to the amount of time an injector must be open to flow a specific amount of fuel. It is a crucial parameter in engine control units for managing fuel delivery. (4.2 ms)

BPW - Brake Pulse Width, which refers to the duration of the brake signal in automotive systems.Commonly used in the context of vehicle dynamics and anti-lock braking systems, BPW is crucial for optimizing braking performance

BMS - Battery Management System [Most brands starting mid-2000s & EVs]

BOV - [Turbo] Blowoff Valve to release pressure from the system when the throttle is closed, preventing compressor surge

BPS - Barometric Pressure Sensor

BPV - [Turbo] bypass valve or diverter valve

BSD - Blind Spot Detection system

BSM - Blind Spot Monitor

BTDT - Been There Done That

BUS - Bus network is a network topology in which nodes are directly connected to a common half-duplex link called a bus. Half-duplex means that between two devices, only one device is capable of transmitting and receiving data on a network or bus at one time. Half-duplex is bi-directional, meaning that data can be sent between devices both ways, but the data can only go in one direction at a time. See AE for full-duplex.

BVSV - Bi-metal Vacuum Switching Valve (Controls the vacuum to the EGR valve (it will not let vacuum flow through unless the coolant is at normal operating temp. - toyota)

BWD - Broken When Delivered (parts)

CAB - Controller Antilock Brake (aka ABM - Antilock Brake Module, ABS - Antilock Brake System)

CAC - Charge Air Cooler Pipe (Ford diesel trucks like the 6.7)

CAD - Computer Aided Design

CAI - Cold Air Intake

CAM - Computer Aided Manufacturing

CAN - (aka CANBUS)[Serial] Controller Area Network (F-CAN = Fast-CAN [dual wires for powertrain control & high-speed comm. modules], B-CAN = Body-CAN [single wire for accessories & body modules])

CBC - Common Body Controller (aka BCM - Body Control Module)

CCM - Comprehensive Component Monitor (OBD-1 - GM)

CCM - Comfort Control Module (Audi, VW) - basically the body control module BCM in other cars

CCV - Cannister Closing Valve (EVAP)

CDI - Capacitive Discharge Ignition

CDJR - Chrysler / Dodge / Jeep / RAM

CEM - Central Electronic Module (Volvo) is a critical component in a Volvo vehicle that controls many of its electronic systems, including lighting, instrumentation, and communication with other modules.

CFC - Cylinder Fuel Control monitors (Jeep)

CFI - Central Fuel Injection. An older system where a single injector feeds fuel to the engine, either through the throttle body or a small manifold. This was an improvement over carburetors but was largely replaced by more advanced systems like multi-port fuel injection.

CFI - Continuous Fuel Injection. A term sometimes used to describe how an engine fuel system operates, providing fuel in a continuous, accurate manner compared to older, less precise carburetors.

CFM - Clear Flood Mode (gas pedal to the floor deactivate fuel and holds throttle body wide open for max air intake if equipped)

CGW - Central Gateway Module

CHMSL - Center High Mounted Stop Lamp

CIS - Continuous Injection System {Bosch}

CKP - Crankshaft Position sensor

CMCV - Charge Motion Control Valves (CMCV), also known as Intake Manifold Runner Control (IMRC) have been on certain models of Mustangs for almost 20 years now. IMRC was introduced in the mid-90's on the 4V Cobra engines boosting low-end torque and improving fuel economy.

CMOS - Complementary Metal Oxide Semiconductor is a type of metal-oxide-semiconductor field-effect transistor fabrication process that uses complementary and symmetrical pairs of p-type and n-type MOSFETs for logic functions. CMOS technology is used for constructing integrated circuit chips, including microprocessors, microcontrollers, memory chips, and other digital logic circuits.

CMP - Camshaft Position sensor

CNC - Computer Numerical Control machine, encompasses the manufacturing process where machines cut, carve and form parts based on computer codes that control the cutting tool’s speed and movement.(sometimes incorrectly referred to as a C and C machine

CND - Can not duplicate [concern] alaso see NPF

CO - Carbon Monoxide (rich indicator will increase if insufficient amount of air, normal in close loop should be less than .75, catalytic can lower it to near zero. faulty sensor input can affect this too)

CPI - Central Port Injection (GM, aka CFI)

CPO - Certified Pre-Owned (vehicle)

CO2 - Carbon Dioxide (desirable combustion indicator. should be minimum 12 percent. late model typically 13.5 to 15.5 percent. if other gases are good and CO2 not above 12, look for mech. problem or exhaust sample dilution)

CP - Customer Pays (flat rate insurance related) For CP, I used to use Alldata for reference, but their times have gotten absolutely horrible over the last few years. Now I go by SLTS [service labor time standards] and multiply by 1.5.

CPI - Central Port Fuel Injection (unit)

CRD - Common Rail Design in diesel fuel injection

CRM - Customer Relationship Management (software)

CS - Camshaft Sensor

CSI - Customer Satisfaction Index

CTD - Content Theft Deterrent [alarm system]

CTS - Coolant Temperature Sensor

CV - Constant Velocity joints (CV axle/shaft)

CVCC - Compound Vortex Controlled Combustion is an internal combustion engine technology developed and trademarked by the Honda. Compound refers to the use of two combustion chambers; Vortex refers to the vortex generated in the main combustion chamber, increasing combustion speed, and Controlled Combustion refers to combustion occurring in a timely, controlled manner. The engine innovatively used a secondary, smaller auxiliary inlet valve to feed a richer air-fuel mixture to the combustion chamber around the spark plug, while the standard inlet valve fed a leaner air-fuel mixture to the remainder of the chamber, creating a more efficient and complete combustion.

CVT - Continuously Variable Transmission

CVV - Crankcase ventilation valve, BMW for PCV

CYA - Cover Your Ass

D1 - Customer Authorization (D1) form within the NASTF SDRM portal. https://wp.nastf.org/?page_id=367

DAC - Digital Analog Converter in car audio. Audio DAC

DAS - Dual Axis Steering (Mercedes)

DAS - Drive Authorisation System (Mercedes immobilizer)

DCM - Diagnostics Communication Manager (responsibility of reading and writing the fault codes or diagnostic trouble code in the fault memory of the automotive ECU)

DCT - Dual Clutch Transmission

DD - Daily Driver

DDM - DDM fuse is an acronym for the Driver Door Module fuse. It is the fuse that is concerned with locking, unlocking, and activating certain features in the driver door. This DDM module houses the driver’s door switch, the door lock actuator, and the door lock motor.

DEF - Diesel Exhaust Fluid (basically amonia (NH3), see SCR, since 2010)

DEM - Diagnostics Event Manager (responsible for storing and processing diagnostic errors (events) and all the data associated with it)

DFM - Dynamic Fuel Management (a smarter version of AFM. With DFM, the engine can turn off two cylinders, four cylinders, or any of the eight it sees necessary to meet the current situation and demand. Was meat to fix the lifter coolapse of the previous LS generation (2007-2014) in 2019, but in essence made it worse with even more lifters collapsing. see 2020 TSB.)

DIC - Driver Information Center (GM)

DME - Digital Motor Electronics (in BMWs, same as ECM)

DME - Differential Manchester Encoding is used for the lower speed 10Base-T1S. It transmits an embedded clock along with the data and guarantees very low DC baseline wander due to highs and lows being of equal duration (Figure 3). A low-to-high transition represents a logical 0, while a high-to-low transition represents a logical 1. The embedded clock and data are easy to recover, even in noisy environments like an automotive vehicle.

DMTL - Diagnostic Module for Fuel Tank Leakage (BMW)

DOD - Displacement on Demand (Chevy aka AFM)

DPF - Diesel Particulate Filter (diesel exhaust, 2007 & up)

DPFE - Differential [Delta] Pressure Feedback Electronic (sensor on EGR valve measures the difference in pressure of the exhaust gas both before and after it passes through the EGR system. This pressure difference, also known as the "differential pressure," is indicative of the flow rate of exhaust gas recirculation.)

DPM - Diesel Particulate Matter (soot)

DIN - Duetch Industri Normen, which translates to "German Institute for Standardization. A single DIN [audio] head unit is 2 inches tall by 7 inches wide, while a double DIN unit is twice the height.

DIS - Distributor-less Ignition System

DISA - German for Differential intake system, intake valve system in bmw. adjusts the length of manifold runners.

DLC - Data link connector (OBDII SAE J1962 Data Link Connector )

DME - Digital Motors Electronics (BMW, same as BCM)

DMTL - Diagnostic Module Tank Leakage. It’s part of the EVAP (Evaporative Emissions Control) system is BMWs.

DOHC - Double Over Head Cam

DoIP - Diagnostics Over Internet Protocol, requirements are determined in ISO 13400. (see D:\Documents\CARS\01A RESTORATION\A PCM - ECM (Powertrain Control Modulle - Engine Control Module)\A Diagnostics Over Internet Protocol (DoIP))

DPF - Diesel Particulate Filter

DPMS - Display Power Management System

DRL - Daytime Running Lights

DRM - Digital Rights Management

DRP - Direct Repair Program shops Provide substantial discounts to the ins. co., Limit the scope of repairs as defined by an ins. co., Utilize parts and materials as dictated, & have usually entered into an agreement with an ins. co. whereby the shop will have agreed to: Back the insurance company in the event a dispute

DRW - Dual Rear Wheel (duallies trucks)

DS - Diagnostic Signal (Toyota)

DSC - Dynamic Stability Control (BMW, Mazda, see ESC)

DSO - Digital Storage Oscilloscope

DSP - Diagnostic Service Processing (analyzes the format of the service request and interacts with other components of the AUTOSAR BSW to fetch the data required for the processing. configured using tools like Vector Tool Chain)

DSP - Digital Signal Processors (chips usually for audio processing & communication)

DSRC - Dedicated Short Range Communication (Wireless Vehicle-to-Vehicle Communication - two or more vehicles can exchange data regarding their speed, acceleration, distance and direction.)

DTC - Diagnostic Trouble Codes

Duraspark - Ford began using electronic ignitions in 1973 with the Duraspark electronic ignition system and introduced the Duraspark II system in 1976.

DUT - Device Under Test [in electronics]

DVI - Digital Vehicle Inspection (A tool for conducting vehicle inspections electronically.)

DVOM - Digital Volt Ohm Meter

EAS - Electronic Air Suspension System

EBCM - Electronic Brake Control Module

EBD - Electronic Brake-Force Distribution, a subsystem of the vehicle's anti-lock braking system and electronic stability control (ESC)

EBR - Electronic Brake Regulation in mercedes

ECM - Engine Control Module (see also PCM)

ECU - Electronic Control Units including Engine Control Unit(up to 70 per car)

ECU - Engine Control Unit,

ECT - Electronic Controlled Transmission (dash button in toyotas)

ECT - Engine Coolant Temperature (Sensor)

ECU - Engine Control Unit

eCVT - Electronically-Controlled Continuously Variable Transmission

EDA - Electronic Design Automation

EDR - Event Data Recorder

EEC - Evaporative Emissions Control system, which captures fuel vapors from the tank.

EEC - Electronic Engine Control (Ford, aka ECU - Engine Control Unit), referring to a car's computer system that manages the engine and emissions.

EEPROM - Electrically Erasable Programmable Read Only Memory (chips)

EI - Electronic Ignition

EIS - Electronic Ignition Switch (Mercedes Benz - The symptoms can range from intermittent starting problems to complete vehicle immobilization. EIS failure in Mercedes-Benz vehicles is a prevalent issue that can lead to frustrating starting problems or even complete immobilization of the vehicle)

EFE - Early Fuel Evaporation (older TBI system)

EFI - Electronic Fuel Injection

EGT - Exhaust Gas Temperature Sensor (mostly diesel engines but 2016 Bentley also, the fail often on those and there is no way to diag other than replace)

EGR - Exhaust Gas Recirculation

EHPS - Electro-Hydraulic power Steering (a fuel-efficient steering system that uses hydraulic fluid for power assist but replaces the engine-driven pump with an electric motor)

EIS - Electronic Ignition Switch (aka EZS Mercedes)

EKPS - Electronic fuel pump control module in BMWs

ELR - Effective Labor Rate (Labor revenue ÷ labor hours sold = effective labor rate)

EMF - Electromotive Force (in atom's protons/electrons theory. aka voltage, the battery and alternator in cars)

eMMC - eMMC stands for embedded MultiMediaCard in Tesla vehicles. It’s a type of non-removable flash memory chip, similar to what’s used in smartphones or tablets. In Teslas (especially Model S and Model X built before ~2018), the eMMC chip is soldered onto the MCU1 (Media Control Unit) board. Stores the operating system, logs, and frequently accessed data. Handles things like the touchscreen interface, navigation data, and vehicle settings.

EMP - Electromagnetic Pulse. a short, powerful burst of electromagnetic energy that can disrupt or destroy electronic devices and critical infrastructure like the power grid. EMPs can be triggered by the high-altitude detonation of a nuclear weapon, an artificial non-nuclear device, or naturally occurring solar storms (geomagnetic disturbances or GMDs). The resulting energy creates electrical surges that can "fry" circuits, leading to widespread failures in communication, transportation, water systems, and financial services.

EMS - Engine Management System (EMS)

EOP - Engine Oil Pressure

EOS - Exhaust Oxygen Sensor

EOT - Engine Oil Temperature

EPB - Electronic Parking Brakes

EPC - Electronic Power Control. dash warning light that indicates a problem w the vehicle computer-controlled systems or sensors. Usually air/fuel related problem like vacuum leak, misfires. Check Engine Light will come next. often relates to throttle body, pedal, speed sensor, brake light switch, MAF, traction control, cruise control, turbo or turbo actuator, clogged fuel line, fuel injector, dying battery or very low engine oil level. Jokingly EPIC mode. VW & Audi cars mostly. Car can also go in limp mode.

EPC - Electronic Pressure Control solenoid in transmission. Zero duty cycle usually correspond to full pressure. 100% duty cycle correspond to lowest pressure (at idle for example).

EPS - Electric Power Steering, Electronic Power Steering (EPS in BMW)

EPROM - Erasable Programmable Read-Only Memory (A type of programmable read-only memory that retains data without power. Classic UV-erasable EPROM chips, used mainly in older automotive ECUs, are erased by exposing them to ultraviolet (UV) light through a transparent quartz window on the package. Modern vehicles generally use electrically erasable memory (EEPROM/Flash) instead.)

ESA - Electronic Spark Advance

ESC - Electronic Stability Control

ESD - Electrostatic Discharge, is the release of stored static electricity. Most commonly, it refers to the sudden, potentially damaging discharge of many thousands of volts that occurs when an electronic device is touched by a charged body.

ESD - End-of-Stream Delimiter. See Automotive Ethernet

eSIM - eSIM stands for Embedded SIM, which is a digital SIM that is embedded within the device and not a physical card that you can remove from your phone. (see SIM)

ESL - Electronic Steering Lock (Mercedes)

ESOF - Electronic Shift-on-the-fly (ESOF) system allows drivers to select between 2WD or between two 4×4 drive modes (low or high).

ESP - Electronic Stability Program, also known as ESC (Electronic Stability Control, VDC (Vehicle Dynamic Control) or DSC (Dynamic Stability Control)

ESR - Equivalent Series Resistance. The equivalent series resistance of a capacitor is the internal resistance that appears in series with the capacitance of the device. also known as internal resistance, is a value representing the loss of useful energy in a simple electronic circuit.

ETC - Electronic Throttle Control

EVAP - Evaporative Emission Control System

EVP - EGR Valve Position sensor

EVR - EGR Vacuum Regulator

EVR - Electronic Voltage Regulator

EZS - Electronic starter switch AKA Electronic Ignition Lock (Mercedes) See EIS - Electronic Ignition Switch

FBC - Feedback Carburetor system. It refers to an emission control technology used on some Ford vehicles, particularly older models, that use a carburetor instead of fuel injection. A feedback carburetor system relies on sensors and an electronic control unit (ECU) to maintain the optimal air/fuel mixture, which helps reduce exhaust emissions. For modern vehicles, where carburetors have been replaced by more efficient fuel injection systems, the term FBC is obsolete.

FBCA - Feedback Carburettor Actuator

FCS - Fuel Control Solenoid

FDC - Fuel Deceleration [Valve]

FBO - Full Bolt-On

FCAW - Flux-Core Arc Welding (wire fed, gasless)

FCEV - Fuel Cell Electric Vehicle

FCW - Forward Collision Warning sends out an alert to warn you of a possible collision ahead.

FICM - Fuel injection Control Module (ford diesel)

FMEM - Failure Mode Effect Management (auto transmission failsafe mode, pressure high at all time, shift strategy abort or default action. Ford, essentially limp mode)

FOBIK - Fob Integrated Key

FOD - Foreigh Object Damage

FP - Fuel Pump

FPC - Fuel Pump Control

FPCM - Fuel Pump Control Module

FPDM - Fuel Pump Driver Module

FPS - Fuel Pressure Sensor

FSD - Full Self-Driving

FST - Fuel Strategy Table, Fuel Map (not a common standard acronym)

FTP - Fuel Tank Pressure Sensor

FTS - Fuel Temperature Sensor

Fuse Sizes - Micro, Mini and ATO circuits. ATC and ATO are virtually the same fuse. The C in ATC stands for closed which means the element is closed within the plastic housing. The O in ATO means the element is open to the atmosphere and subject to environment.

FZD - Roof Function Center module (BMW)

GDI - Gasoline Direct Injection (system using electromachanical injectors & a pump)

GDS - Global Diagnostic System

GEM - Generic Electronic Module (just another name for BCM in fords, also SJM/VSM/DDM)

GFF - Guided Fault Finding. Audi West Palm Beach has Guided Fault Finding (GFF), a method in our VAS system that lets us plug in your car and possibly diagnose issues. Such an advanced system allows us to be able to connect to electrical systems and run a series of tests.

GMLAN - General Motors Local Area Network is an application- and transport-layer protocol using controller area network for lower layer services.[1] It was standardized as SAE J2411 for use in OBD-II vehicle networks.

GP - Gross profit

GPM - Gallon per Minute oil pump flow rate

GPRS - General Packet Radio Service is/was a mobile communications standard that operates on 2G and 3G cellular networks to enable moderately high-speed data transfers using packet-based technologies. can also allow for internet access. It suggests that online services such as web surfing, email, chat, and file transfer protocol (FTP) could be accessible via cell phones. The GPRS connection could be seen as a sub-network of the Internet because it uses similar protocols, and GPRS phones could be regarded as mobile hosts since they are using the same methods. GPRS operates on cell phones, laptops, and other portable devices with a GPRS modem or a GPRS Subscriber Identity Module (SIM) card. A GPRS modem is ideal for sending and receiving messages from a computer. Carriers have already begun to turn off existing 2G and 3G networks to make place for the new networks.

GPS - Global Positioning System

GPU - Graphics Processing Unit

GSM - Global System for Mobile Communications

GST - General Service Tech

GST - Generic Scan Tool

GTS - RaceChip GTS Black chip tuning module (it's a trademark)

GWP - Global Warming Potential (is reported relative to carbon dioxide; therefore, a refrigerant with a GWP of 1,000 has 1,000 times greater potential to contribute to global warming than carbon dioxide. Also see ODP)

GWS - Gateway System [toyota hybrid, ECU communication, inverter cooling pump is a frequent issue when comm. stop in many other unrelated modules. the system saves energy by shotting down other less critical systems to protect itself. but do check fuse, power, control, amperage and grounds to the pump before replacing it. should see very visible coolant circulate inside the inverter coolant tank when pump is running. if nothing circulates, pump is not working. red triangle of death dash light, toyota prius hybrid. royalty https://www.youtube.com/watch?v=CA778SO5ntA]

GWS - Gear Selector Switch [BMW]

HAL - Hardware Abstraction Layer (A software layer that provides a consistent interface between the operating system or application software and the underlying hardware. In automotive systems, the HAL allows developers to write ECU software, sensor algorithms, or control applications without needing to manage the specifics of individual microcontrollers, sensors, or actuators, improving portability and simplifying integration across different vehicle platforms.)

HC - Hydrocarbons (unburned fuel molecules. Engine out pre-converter should be less than 300 parts per million in close loop)

HCU - Hydraulic Control Unit. The anti-lock braking system (ABS) module is usually mounted to a hydraulic control unit (HCU). Inside the HCU can be eight or more electric solenoids that control the flow of brake fluid. The ABS module and HCU are the heart of any ABS or stability control system.

HECU - Hydraulic Electronic Control Unit (Hyundai ABS module)

HEI - High Energy Ignition (GM from 1975 through the mid-1980s)

HEV - Hybrid Electric Vehicles

HID - High Intensity Discharge lamps create light by arcing electricity between electrodes through a Xenon-filled capsule, longer life but color can shift as they age, unlike halogen bulbs which use a tungsten filament.

HID - Human Input Device, Human Interface Device

HMI - Automotive Human-Machine interface solutions are features and components of car hardware and software applications that allow drivers and passengers to engage with the vehicle, as well as the outside world.

HOAT - Hybrid Organic Acid Technology Coolant [purple, blue, pink or turquoise](LIKE GOLD ZEREX G05). combination of OAT and IAT coolant, a third type of coolant, derivative of OAT coolant, but has more anti-corrosive properties. It’s important not to mix OAT, HOAT, and IAT. contains added silicates for additional protection against rusting or corrosion of the aluminum parts. It’s meant for newer cars, with some of the top manufacturers recommending it. either mono ethylene glycol or mono propylene glycol. The mono propylene glycol solution is a synthetic option that has no color, is odorless, and doesn’t taste like anything & deemed the safer of the two and is considered non-toxic.

HPF - High Pass Filter in audio sound

HPFP - High Pressure Fuel Pump

HS-CAN - High speed CAN

HSD - High Side Driver, an electronic switch that controls the connection between the positive supply voltage (Vcc) and the load. It typically uses a MOSFET or a BJT to switch the high-side voltage to the load.

HT - High Tension (spark)

HMICM - Human Machine Interface Control Module - cadillac

HVAC - Heating, ventilation and air conditioning

IATN - International Automotive Technicians Network iatn.net

I/M - Inspection/Maintenance tests

IAC - Idle Air Control (same as ISC)

IAT - Intake Air Temperature

IAT - The first coolant [green] was Inorganic Acid Technology (IAT). It's good for a while (around 30,000 miles), but eventually becomes too acidic and has to be changed. Some older cars still use it.

IBCM - Integrated Body Control Module

IC - Ignition Control

IC - Instrument Cluster

IC - Integrated Circuit AKA ICS - Integrated circuits

IC - Intelligent Charging

IC - InterCooler

ICM - Ignition Control Module

ICP - Injector Control Pressure (sensor)(diesel)

ICS - Integrated Center Stack, like infotainment and HVAC controls in cadillac CUE system

ICV - Idle Control Valve

IDM - Ignition Diagnostic Monitor (Verus)

IDM - Injector Driver Module (diesel - can be built in the PCM)

IDPS - Intrusion Detection and Prevention Systems

IDS - Integrated Diagnostic System - Ford proprietary software to run on a Windows based PC

IDU - I don't understand

IGF - Ignition Feedback signal in cars is a 5V signal produced by the igniter after successfully firing the ignition coil. It serves as confirmation to the ECU (Engine Control Unit) that the ignition system is functioning properly.

IHKA - Integrated Automatic Heating and A/C System (BMW)

IIRC - if I remember correctly

IM - Ignition Module

IMA - Integrated Motor Assist (Honda Hybrid such as CRZ)

IMS - Intermediate Shaft (bearing in the context of certain older Porsche vehicles)

IMS - Internal Mode Switch (specifically in automatic transmissions)

INT - Integrator, relates to short term fuel trim in 90's engines., where long term would be BLM

IoT - Internet of Things (A network of connected devices that communicate and share data over the Internet. In automotive applications, IoT enables features such as vehicle-to-cloud diagnostics, telematics, fleet management, connected infotainment, over-the-air software updates, and smart sensor integration, allowing cars to interact with other devices, infrastructure, and services for enhanced safety, convenience, and performance.)

IPC - Instruments panel cluster, can sometimes take the role of BCM.

IPDM - Intelligent Power Distribution Module (Nissan)

IPM - Integrated Power Module (a central fuse/relay box)

IPM - Intelligent Powertrain Management (a fuel-saving cruise control feature using GPS/terrain)

IPR - Injection Pressure Regulator (valve, diesel)

ISC - Idle speed control valve (same as IAC)

ISC Diode - Idle Speed Control Diode aka IAC diode

ISPR - Ignition Switch Position Run

IMMO - Immobilizer Programmer in Scan Tools

IMRC - Intake Manifold Runner Control. (AKA CMCV) The IMRC valve is the part of the intake manifold system that opens and closes the flaps. the technology varies the length of the intake manifold’s airflow passages, known as runners.

In situ - Not an acronym. It’s a Latin term meaning “in place” or “in the original location.” In technical use, it means something is observed, tested, or handled without removing it from where it normally operates.

IVD - Interactive Vehicle Dynamics (used in scan tool after programming ABS module with PMI in Fords)

IVI - In-Vehicle Infotainment

IVM - Integrated Supply Module (aka IPM, an electronic control unit that acts as the main fuse box for engine management, transmission, and other systems - BMW)

IVR - Interactive Voice Response,

IVR - Instrument Cluster Voltage Regulator

IVS - Intelligent Vehicle Support

IWE - Ford's Integrated Wheel End (IWE) system is what locks and unlocks the front hubs when you change back and forth from 2WD and 4WD

KAM - Keep Alive Memory (ECM) circuit

KDSS - Kinetic Dynamic Suspension System (KDSS) technology was employed initially in the Lexus GX 470, and subsequently the 200 Series Toyota Land Cruiser. The system was invented and developed by Kinetic Pty Ltd, a small R&D company based in Dunsborough, Western Australia.[1] It optimally adjusts front and rear stabilizers based on a set of interconnected hydraulic cylinders. The interconnection is made up of hydraulic piping and a control cylinder which is located at the frame rail.[2] KDSS, which is fully mechanical, can disengage the stabilizer bars (the bars are jointed, allowing movement independent of one another).[2] This system will not engage during normal driving conditions, when hydraulic pressure is equal. In off-road conditions, KDSS activates when it senses that a wheel has dropped. DON'T BUY IF KDSS LIGHT IS ON. THE SYSTEM LEAK AND CRAZY EXPENSIDE TO FIX.

KR - Knock Retard

KS - Knock Sensor

Lambda - Lean (higher) and rich (lower) values are calculated for the Lambda scale by dividing the observed A/F ratio with that particular fuel’s stoich.

LAN - Controller Area Network - In the 2000s, the in-vehicle LAN system started to be installed as a standard feature of the car and its installation is rapidly growing to meet the need of exchanging a deal of information among ECUs for engine control, brake control, and other purposes, to improve performance of "driving, turning, and stopping" and better function of car diagnosis. CAN (Controller Area Network) is the common interface standard for power train control at present.

LCM (aka LKM) - Light Control Module BMW. The BMW light control module, commonly known as the LCM, lamp control module, or light check module, is an extremely common part that fails on the BMW E38 and E39.

LCR - LCR Meter for Inductance (L), Capacitance (C), and Resistance (R)

LED - Light-Emitting Diode

LIDAR - Light Detection and Ranging systems

LIN - Local Interconnect Network (serial network protocol used for communication between components in vehicles. It is a single wire,)

LOA - Leave of Absence is an authorized period away from work for various reasons, such as health, family, or education.

LOF - Lube, Oil, Filter.

LPF - Low Pass Filter in audio sound

LS - Lambda Sensor

LSID - Locksmith ID

LSPI - Low Speed Pre-Ignition AKA stochastic pre-ignition (SPI) (a premature combustion event, occurring prior to spark ignition in turbocharged, downsized gasoline vehicles. As the name implies, it occurs when engines operate at low speeds and high loads. It can result in extremely high cylinder-pressures and can lead to heavy knock.) Low speed pre-ignition, often caused by hotspot on the ring pockets that result from calcium in the oil, such as when diesel oil is used in GDI engines. Not the same as standard preignition and detonation.

LVDS - Low-Voltage Differential Signaling (LVDS) is a technology addressing the needs of today's high performance data transmission applications. LVDS is an electrical system and can run at very high speeds over inexpensive, twisted-pair, stranded copper cables. LVDS is a digital interface that transmits data efficiently and reliably with low power consumption and high resistance to interference. It's used in a variety of automotive applications, including infotainment systems, rearview cameras, and panel displays. LVDS's low signal amplitude and differential structure minimize electromagnetic radiation, which helps to minimize video interference. A termination resistor is used at the end of the transmission line to match the impedance of the transmission line and the receiver. This helps to reduce harmful signal reflections that can decrease signal quality.

MAF - Mass Air Flow (Sensor)

MAIC - Machine Adjusted Indirect Comparison ?? (not sure correct meaning as relating to vehicle signal simulator)

MAP - Manifold Absolute Pressure (Sensor)

MAS - Mass Air Sensor. Has no flap. More accurate than AFM. MAS is a BMW term but is same as MAS or AFM w the flap

MAT - Manifold Air Temperature (same as IAT)

MCO - Manufacturer's Certificate of Origin (aka MSO)

MCU - Micro-Controller Units

MCU - The center screen in a tesla car

MDS - Multiple Displacement System [engines (dodge, chevy)] also see AFM, DOD

MDP - Mopar Diagnostic Pod (VCI)

ME - Motor Electronics [as in starter motor]

MFI - Mechanical Fuel Injection is an older, mechanical system used in classic cars. It was used in many high-performance classic and vintage cars from brands like Alfa Romeo, BMW, and Pontiac.

MFI - Multi-Point Fuel Injection is a modern electronic system that is standard on most vehicles today, where a separate fuel injector is dedicated to each cylinder.

MHD - Micro Hybrid Drive

MPCS - Multiplex Control System (automotive engineering)

MIA - Missing In Action (as in cylinder not working)

MIG - Metal Inert Gas arc welding

MIL - Malfunction Indicator Lamp (Check Engine Light)

MLS - Multi-Layer Steel head gaskets

MOSFET - Metal-Oxide-Semiconductor Field-Effect Transistor

MOST - Media Oriented Systems Transport bus, a high-speed multimedia network technology. - At the core of the Cadillac CUE Infotainment System.

MPFI - Multi-Port Fuel Injection

MPI - Multi Point Inspection

MRE - Magnetic Resistive Element (used in a type of wheel speed sensor)

MSO - Management Services Organization

MSO - Manufacturer's Statement of Origin (aka MCO)

MSO - Multiple Shop Owners

MTBF - Mean Time Between Failures

NASTF - National Automotive Service Task Force

NBR - Nitrile Butadiene Rubber (flexible, synthetic rubber hose engineered for excellent resistance to oil, fuel, grease, and chemicals, making it ideal for automotive, industrial, and hydraulic applications. It is commonly used for transporting gasoline, diesel, and biodiesel, as well as in hydraulic systems.)

NOID - Non-Operating Injector Detector (light)

MPI - Multi-point/Multi-port injection

MPI - Multi-Point Inspection

MUX - Multiplexed network

NPF - No Problem Found. also see CND

NHTSA - National Highway Traffic Safety Administration

NOX - Oxides of nitrogen create smog in atmosphere when mixed w hydrocarbon. Controlled with EGR to keep cylinder temp below 2,500 F. Cats will reduce it and should be less than 1,000 parts per million under road load. If rich CO will be high while CO2 will be very low. If CO is low and CO2 is high look for misfires)

NTC - Negative Temperature Coefficient

NVH - Noise Vibration Harshness

NVM - Non-Volatile Memory (Memory that retains stored data even when power is removed. In automotive systems, NVM is used in ECUs to store firmware, calibration data, sensor logs, and configuration settings.)

O2, O2S - Oxygen (O2) Sensor (Lambda sensor) (lean indicator will increase if lean. oxygen and carbon monoxide are equal at stoic 14.7 air/fuel mixture. normal in less than 1.5/100 in computer controlled engines. misfires can increase O2 since air not burned. If O2 high but runs good check for sample dilution, if runs poorly check for cacuum leaks or misfires)

OAT - Second form of engine coolant [orange] was Organic Acid Technology or OAT. OAT utilizes additives to significantly increase time between system flushes, but it does have slightly reduced anti-corrosive properties. Nonetheless, many manufacturers use it in modern vehicles due to its long lifespan.

OBC - On-Board Charger (electric vehicles)

OBC - On-Board Computer

OBD - On-Board Diagnostics (OBD_II started in 1996)

OBDII PIDs - On-board Diagnostics Parameter IDs

OBS - Old Body Style [GM truck]

OCS - Oil Control Solenoid (ford diesel)

OCV - oil Control Valve, also known as an OCV or a VVT solenoid, is part of the variable valve timing system. It plugs into the car's main wiring harness and should be found somewhere in the upper part of the engine.

ODP - Ozone Depletion Potential (scale based on CFC-11 having been assigned a factor of 1. CFC-12 has an ODP of 1.0, HCFC-22 has an ODP of 0.05, and HFC-134a has an ODP of 0.0. Also see GWP)

OES - Original Equipment Suppliers

OHC - Overhead Cam

OHV - Overhead Valve

OLED - Organic Light-Emitting Diode

OLM - Oil Life Monitor

OPS - Oil Pressure Sensor

ORN -

ORC - Occupant Restraint Controller (Fiat-Chrysler)

ORVR - On-board Refueling Vapor Recovery

OSS - Output Shaft Speed

OTA - Over-The-Air update is a type of software download that takes place over a cellular network or Wi-Fi connection and is delivered remotely to your connected car.

OTD - Out The Door (price)

OTS - Oil Temperature Sensor

PACM - Parking Assist Control Module - cadillac

PAM - Pulse Amplitude Modulation. 100Base-T1 and 1000Base-T1 use PAM3 multi-level signaling (Figure 4). At any given time, a PAM3 signal is in one of three states designated as -1, 0, or +1. The levels are detected as the signal crosses voltage thresholds set by the receiver. Significant combinations of -1, 0 and +1 are known as ternary symbols. PAM3 signaling transfers 1.5 bits per clock cycle and increases the throughput for the same baud rate as bi-level signals. So, for a given clock rate, the symbol rate is proportionally lower. This reduces signal transition times, which reduces EMI, another plus for automotive applications. MultiGBase-T1 uses PAM4 signaling with four logical levels, which further increases throughput but decreases noise tolerance.

PassLock - system designed to prevent vehicle theft by disabling fuel

PATS - Passive Anti-Theft System (PATS Key System Programming)

PCB - Printed Circuit Board

PCD - Pitch Circle Diameter - A wheel's bolt pattern can also be called its "Bolt Circle"

PCI - Programmable Communications Interface [bus line (Chrysler)]

PCM - Powertrain Control Module, PCM if the ECM device oversees both engine and transmission operations.

PCS - Pre-Collision System

PCV - Positive Crankcase Ventilation

PCV - Purge Control Valve (EVAP)

PDC - Park Distance Control

PDC - Power Distribution Center (basically the same as the old TIPM in chryslers)

PDI - Pre-Delivery Inspection (for new cars)

PDM - Power Distribution Module

PDS - Pre-Delivery Service (for new cars)

PDR - Paintless Dent Repair

PDU - Protocol Data Unit (A formatted unit of data transmitted over a network. In automotive systems, PDUs are used in vehicle networks like CAN or Ethernet to carry messages between ECUs and sensors.)

PE - Power Enrichment (in hP Tuner)

PEM - Passive Entry Module (on older Chrysler for locating key fobs in or around the vehicle for entry and push button start without pushing buttons on the remote, but not all of them have it)

PEPS - Passive Entry Passive Start [module] (GM)

PHEV - Plug-in Hybrid Electric Vehicle

PM - Preventive Maintenance [Service]

POAT - Phosphate Organic Acid Technology coolant. most Asian vehicles switched from HOAT to POAT.

POE - Poly Olester Oil, is a hygroscopic synthetic oil that is used in refrigeration compressors. When coming in contact with air it absorbs moisture.

PID - Parameter Identifier (OBD-II PIDs are codes used to request data from a vehicle aka Data PIDs)

PIP - Profile Ignition Pickup (aka Pickup Coil)

PLC - Programmable Logic Controller (A rugged digital computer used to control machinery and industrial processes. In automotive and manufacturing applications, PLCs manage assembly lines, robotic arms, conveyor systems, and other automated equipment by executing pre-programmed logic based on sensor inputs and control outputs.)

PLD - Programmable Logic Device

PMI - Programmable Module Installation (included in most hi-end scan tools to program modules like ABS, also see IVD)[Fords]

PP - Premium Package [oil change]

PROM - Programmable Read Only Memory (mid 80s and GM v6 )

PSI - Lb./Square Inch

PSPS - Power Steering Pressure Switch

PTC - Positive Temperature Coefficient

PTO - Power Take-Off on a truck (for auxiliary equipment)

PTO - Paid Time Off [hours]

PTU - Power Transfer Unit (4 wheel drive)

PWM - Pulse Width Modulation (An electronic signal with a variable on/off time) (duty cycle) (Solenoid)

R&B - Replace and Balance [tires] ???

R&R - Remove and Replace

RC - Radio-Controlled car toys

RC - Resistor-Capacitor circuit

RC - Relative Compression

RCDLR - Remote Control Door Lock Receiver

RCA - Root-Cause Analysis

RCM - Restraint Control Module

RCM - Rear-End Collision Warning

RDI - Remove Disassemble and Inspect

REM - Rear Electronic Module (BMW)

RFH - Radio Frequency Hub [module] aka Radio Frequency Hub Module (RFHM) (also known as the RF Hub/RFH) is an integrated receiver (or base station) in the vehicle that communicates with other electronic modules in the vehicle over either the Controller Area Network (CAN) data bus or a private serial bus to support the following standard and optional vehicle features or systems (such as ignition, shift interlock, passive entry, keyless remote, immobilizer, remote start, alarm).

RFQT - Reductant Fluid Quality Test (diesels, also see SCR & DEF)

RKE - Remote Keyless Entry [module]

RMA - Rubber Manufacturers Association (tires)

RMS - RMS (Root Mean Square) electric value/signal ("The RMS value of a set of values (or a continuous-time waveform) is the square root of the arithmetic mean of the squares of the values, or the square of the function that defines the continuous waveform.In physics, the RMS current value can also be defined as the "value of the direct current that dissipates the same power in a resistor." - RMS is a measure of AC voltage. A signal with a voltage of 10V RMS would have the same power in a resistive load as a 10V DC signal. )

RMS - Root Mean Square is a measurement of the average power of an audio signal over time.

ROM - Read-Only Memory

RPO - Regular Production Option is a General Motors standard coding for vehicle configuration options Each RPO code is a combination of three alphanumeric characters (like Z71) that refers to a specific

RTC - Real-Time Communication (Technology that enables live, low-latency audio, video, or data exchange between devices. In automotive applications, RTC is used for features such as in-vehicle teleconferencing, live diagnostics, remote control, and connected infotainment systems.)

RTM - Radio Transceiver Module (Ford)

RTSA (aka RTA) - Real Time Spectrum Analyzer for use in car audio

RTV - Room Temperature Vulcanizing [sealant]

SA - Service Advisor

SAM - Signal Acquisition Module in Mercedes (near fuse box, left side by the firewall)

SAP - Secondary Air Pump

SAS - Steering Angle Sensor

SBC - System Basis Chip, An SBC is an integrated component that combines common system features required on Automotive ECUs such as: communication transceivers, voltage regulators, diagnostics and supervision functions, switches and wake inputs.

SCADA - Supervisory Control and Data Acquisition (A control system architecture used to monitor and manage machinery and industrial processes. In automotive manufacturing or vehicle testing, SCADA systems collect data from sensors and PLCs, enabling real-time supervision, automated control, and diagnostics of production lines, robotic systems, or test rigs.)

SCC - Smart Cruise Control (Hyundai/Kia)

SCN - Software Calibration Number coding with Star Diagnostic (Mercedes) since around 2005

SCR - Selective Catalytic Reduction (diesel exhaust, see DEF, since 2010)

SDM - Sensing Diagnostic Module (the Modern Motor Vehicle's "Black Box". Installed over the transmission hump (under the console), under the dashboard, or under the seat. The SDM detects accelerations and makes split-second decisions for deployment (of airbags))

SDR - Software Defined Radio (analgog to digital conversion)

SDRM - Secure Data Release Model. NASTF is charged with creating, managing access and maintaining the Secure Data Release Model as a means for automakers to share security related information and tool functions with independent repairers and locksmiths.

SES - Service Engine Soon (light)

SFI - Sequential Fuel Injection

SEFI - Sequential Electronic Fuel Injection is a system that injects fuel into the engine's cylinders in a timed, sequential order. Unlike older multi-point systems that fire injectors at the same time, SEFI precisely times each injector to fire just before its corresponding intake valve opens, improving efficiency and performance.

SGM aka SGW module - secure gateway module (Most 2018 and newer FCA [Fiat Chrysler Automobiles] vehicles include a SGM which limits an aftermarket scan tool to only reading DTCs and viewing data.)

SIG RTN - Signal Return (ECU's sensor ground reference. Common return path for ECT, TPS, etc, separare from chassis ground.)

SIM - Subscriber Identity Module card (also see eSIM)

SJB - Smart Junction Box, AKA Body Control Module (BCM) after approx 2011, is also known as the generic electronic module (GEM) Ford

SKIM - Smart Key Immobilizer Module (Chrysler)

SLTS - Service Labor Time Standards - For customer pays (CP) (flat rate insurance related), I used to use Alldata for reference, but their times have gotten absolutely horrible over the last few years. Now I go by SLTS [service labor time standards] and multiply by 1.5.

SLS - Sun Load Sensor

SM - Service Manager

SMCM - Seat Memory Control Module - Cadillac

SMS - Shop Management System, shop management software

SMT - Systems Maintenance Technician (at Ford dealers)

SNAP - Significant New Alternatives Policy (relating to greenhouse and ozone layer policies. see GWP and ODP)

SOC - Security Operations Center

SoC - State of Charge in electric vehicles

SoC - System on a Chip (An integrated circuit that combines multiple components, such as a processor, memory, and peripheral interfaces, onto a single chip. In automotive systems, SoCs are used in ECUs, infotainment systems, ADAS (Advanced Driver Assistance Systems), and sensor processing units to provide compact, efficient computing for vehicle control and connectivity.)

SOD - Side Object Detection Control Module [L-SODCM Left Side Object Detection Control Module & Right] (GM)

SOHC - Single Over Head Cam

SOP - Standard Operating Procedure,

SPI - Stochastic Pre-Ignition (SEE LSPI)

SPL - Sound Pressure Level in car audio

SPOUT - SPark OUTput connector (a jumper plug in Ford EEC-IV systems that disables computer timing adjustments for setting base ignition timing; removing it lets the distributor's sensor set the timing, while inserting it reconnects the computer for dynamic control, often seen with the TFI module.)

SPR - Self-Piercing Rivets (tesla)

SPS - Service Programming System (GM)

SRS - Supplemental Restraint System

SRW - Single Rear Wheel (trucks as opposed to DRW (duallies))

SSD - Start-of-Stream Delimiter. See Automotive Ethernet

SWAG - Scientific Wild A$$ Guess

SWC - Steering Wheel Control [module]

T&M - Time and Material

TAC - Throttle Actuator Control

TBI - Throttle Body Injection

TCB - Emergency Battery [TCB system] (BMW)

TCM - Transmission Control Module - The electronic computer that controls the operation of the automatic transaxle.

TDM - Transportation Demand Management (TDM) is the use of strategies to inform and encourage travelers to maximize the efficiency of our transportation systems leading to improved mobility, reduced congestion, and lower vehicle emissions.

TCC - Torque Converter Clutch (solenoid)

TCICM - Telematics Communication Interface Control Module - cadillac

TCS - Traction Control System

TDC - Top Dead Center

TDI - Turbocharged Direct Injection (VW)

TDM - Theft Deterrent Module

TFC-LCD - Thin-Film Transistor liquid-crystal display

TFI - Thick Film Ignition, or thick film integrated ignition (TFI-IV, in conjunction with EEC-IV). It is a small grey plastic module that houses solid-state electronic parts, all of which are suspended in a thick translucent, electrolytic (meaning it is conductive) film. used on Ford vehicles with distributors from the early 1980s to the mid-1990s

TFP - Throttle Fluid Pressure

TFP - Transmission Fluid Pressure

TIG - Tungsten Inert Gas welder

TIPM - Totally Integrated Power Module (Chrysler - not uncommon is a shorted wire in the harness that runs from the TIPM to the cabin behind the splash shield in the front driver's side wheel well...they can rub up against the frame at the bend where the harness exits the engine compartment. )

TIMS - Toyota Insurance Management Solutions, LLC. you can disable it reporting this kind of information to insurance in your settings. It’s basically the same as the ones insurance companies offer that plug into OBD2 but it comes in the car.

TLDR - Too Long; Didn't Read

TPI - Tuned Port Injection where fuel is injected directly in the intake ports.

TPM - Trusted Platform Module (A hardware-based security chip that provides a secure environment for storing cryptographic keys and performing security-related operations. In automotive applications, TPMs are used in ECUs and connected vehicle systems to protect firmware, secure communication, authenticate software updates, and ensure the integrity of critical vehicle data.)

TPMS - Tire Pressure Monitoring Sensor

TPS - Throttle Position Sensor (aka Throttle Pedal Sensor)

TRP - Theft Relevant Parts (Mercedes)

TRS - Transmission Range Sensor. (multi-position switch provides input to the PCM).

TS or TQS - Torque Sensor / Torque Quality Sensor (steering)

TSB - Technical Service Bulletin

TTL - Time To Live (A value that defines how long a data packet can remain in a network before being discarded. In automotive systems, TTL is used in in-vehicle networks and connected car communications to manage message lifetimes, prevent stale data, and ensure timely delivery between ECUs, sensors, and telematics units.)

TTY - Torque to Yield (bolts)

TV - Throttle Valve (refers to a small valve in the automatic transmission that determines hydraulic line pressure. This valve is hooked via a cable mechanism to the throttle linkage. As the throttle opens, the cable is pulled out of the transmission, signaling the transmission to increase line pressure to accommodate the additional torque.)

TVI - Tactical Vehicle Intervention (law enforcement PIT maneuver - Precision Immobilization Technique)

TWC - Three-Way Catalytic converter

TXV - Thermostatic Expansion Valve (TXV) is a metering device that separates the low- and high-pressure sides of your air conditioning unit

UBP - Uart Based Protocol (network circuit)

UBS - Uniform Bearing Stress (for crank bearings, etc)

UDS - Unified Diagnostics Services. OFF-BOARD diag. - issues are stored in the EEPROM part of the vehicle ECU for retrieval. capable of offering services such as vehicle ECU reprogramming, remote routine activation, writing data on the automotive Electronic Control Unit and even more. configurations are mostly OEM-specific. It means that a tester tool authorized by the same automotive OEM can only read or write data from the vehicle ECU. Unlike the OBD 2, any after-market tester tool will not work. ISO 14229 standard, Unified Diagnostic Services.

UEFI - Unified Extensible Firmware Interface (A modern firmware interface that initializes hardware and bridges it to the operating system. In automotive systems, UEFI is used in advanced ECUs, infotainment platforms, and vehicle computing modules to manage secure boot, hardware initialization, and system updates, providing faster startup and enhanced security features.)

UEGO - Ford Universal Exhaust Gas Oxygen (O2 Sensors)

USB - Universal Serial Bus (A standard interface for data transfer and power delivery. In automotive applications, USB ports are used for connecting infotainment devices, charging mobile devices, programming ECUs, interfacing diagnostic tools, and transferring data between vehicle systems and external devices.)

UTQG - Uniform Tire Quality Grade

UVI - Used Vehicle Inspection [at dealers]

VAF - Vane Air Flow sensor is an early type of airflow measuring device used in many older EFI systems. It uses a spring-loaded flap connected to a potentiometer to measure how much air enters the engine.

VAG - Volkswagen Audi Group

VANOS Valve - German BMW abbreviation equivalent to solenoid VVT OR VCT

VAS - Vehicle Alarm System

VAT - Value Added Tax is the tax applied to goods and services by HM Revenue and Customs (HMRC) in the UK. VAT for a car is 20%. This is included in the advertised price of a car.

VATS - Vehicle Anti-Theft System

VC - Valve Cover

VCI - Vehicle Communication Interface

VCIM - Vehicle Communication Interface Module

VCM - Variable Charge Motion (actuator (Hyundai) aka Variable Intake Control, basically an intake air control actuator aka intake manifold runner actuator)

VCM - Vehicle Control Module

VCM - Variable Cylinder Management (honda pilot)

VCT - Variable Cam Timing

VCV - (Fuel) Volume Control Valve

VDC - Vehicle Dynamic Control (see ESC)

VCI - Vehicle Communication Interface (for OBDII scan tool)

VCIM - OnStar ((GM)

VCM - Vehicle Control Module (anti-theft). Ford, GM and Dodge single VCM licenses locks to mixture of values in the PCMs. What this means for us is that it adds a layer of security from reusing licenses based on just a VIN number.

VCM - Variable Cylinder Management, Honda's variable displacement technology

VDC - Vehicle Dynamic Control, is the same thing as electronic stability control (ESC), which has been mandatory on vehicles sold in the United States since 2012.

VE - Volumetric Efficiency, VE table [primary] is the main fuel map. It is the VE (percent of cylinder air fill) and therefore is used to compute the matching amount of fuel [see AFR Table]

VGT - Variable Geometry Turbocharger (actuator, the mechanical or electronic component responsible for adjusting the angle of movable vanes inside a VGT turbocharger. By controlling these vanes, the actuator dynamically changes the turbo's "aspect ratio" to optimize boost pressure for different engine speeds and loads, reducing turbo lag at low RPMs and managing boost at high RPMs. Modern actuators are often electronic, receiving signals from the engine's control unit (ECU) to precisely move the vanes.)

VID - Vehicle Identification (VID) block in the PCM (Ford-Lincoln)

VLOM - Valve Lifter Oil Manifold & solenoid (chevy 5.3 L)

VME - Virtual Machine Environment

VOC - Volatile Organic Compound (requiements relating to greenhouse and ozone layer policies. see GWP and ODP)

VPS - Valve Pause System (Honda Pilot - part of the Variable Cylinder Management (VCM) system, which helps improve fuel efficiency by deactivating cylinders under certain driving conditions. It uses oil pressure to activate or deactivate cylinders in three modes: 3-cylinder, 4-cylinder, and 6-cylinder operation. Common issues include a check engine light (CEL) with codes like P3400 or P3497, often related to low oil levels or a faulty oil pressure sensor.)

VPS - Valve Position Sensor

VPWR - Vehicle Power (Battery Voltage)

VREF - Voltage Reference (5-volt reference)

VRLA - Valve Regulated Lead Acid [battery] aka recombinant battery, as the hydrogen and oxygen recombine to form water during charging. Two types: gel and glass mat (AGM)

VRMS or RMS voltage - Root Mean Square voltage (It means, that if you have a sin wave with an RMS value of 10 Volts RMS, in order to deliver the same power via DC voltage, you would need 10 volts DC.)

VSA - vehicle stability assist (toyota, Honda and Acura)

VSC - Vehicle Stability Control

VSM - Vehicle Stability Management (provides further enhancements to vehicle stability and steering responses under the following condition: when driving on a slippery road or when a change in the coefficient of friction between left and right wheels is detected.)

VSM - Vehicle Security Module Technology

VSP - Vehicle Security Professional

VSS - Vehicle Speed Sensor

VSV - Vacuum Switching Valve (toyota secondary air injection)

VTD - Vehicle Theft Deterrent (GM)

VVT - Variable Valve Timing

VVT-i - Variable Valve Timing with intelligence

WCM - Wireless Control Module (Chrysler) is a system that. integrates the keyless entry function, with which. remote operation (opening/closing of all doors, open- ing of trunk lid, and operation of warning function that. warns a person who intends to damage the vehicle.

WIN - Wireless Ignition Node (Chrysler)

WOT - Wide Open Throttle

WPS - Wheel Position Sensor

WSS - Wheel Speed Sensor

WWG1WGA - where we go one, we go all

YOLO - You Only Live Once