Decoding your vehicle owner’s manual or your mechanic’s latest status report can be confusing if you’re not familiar with common car terminology. To make matters even more complicated, new technologies are adding words to the lexicon on a regular basis.
The next time you come across a term that leaves you feeling confused, consult this handy guide for clarification. These definitions can help with routine maintenance tasks, diagnostics and repairs as well as describing problems when you bring your car into the shop.
ABS
Short for anti-lock brake system, ABS describes the braking technology that prevents car wheels from locking up when a sudden stop is required.
Air Conditioning
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A cooling system that originally appeared in cars in 1970. Abbreviated as AC, it uses refrigerant and a compressor to lower temperatures inside the vehicle to make the ride more comfortable.
Airbags
Safety features consisting of air-filled cushions that deploy immediately in the event of an accident to prevent injury to a vehicle’s occupants.
Air filter
A filter made from fabric or paper that prevents dirt, dust, debris and other contaminants from entering the engine.
Brakes (Disc and Drum)
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The system that stops your car. Disc brakes use calipers to apply pressure to metal discs called brake rotors. Drum brakes involve a combination of a metal drum and brake shoes.
Chassis
A blanket description of the frame of a vehicle and the mechanical parts that are attached to it, including the power train and suspension.
Climate Control
The term used to refer to the heater, air conditioner and defrosting mechanisms in a car. Some vehicles have advanced systems that detect outdoor temperatures and can be adjusted accordingly.
Coolant
Also called antifreeze, this combination of ethylene glycol and water protects the climate control system by dispersing excess heat and preventing parts from freezing.
Cylinder
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One of the four, six or eight cavities in the engine block in which pistons are located and where combustion action occurs.
Drivability
How smoothly a vehicle accelerates and idles, how well it starts at different temperatures and its ability to adapt to various driving conditions.
Drive Range (EV)
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A term that refers to how far an electric vehicle can be driven before you need to recharge the battery.
Drivetrain
All of the parts of a car that work together to make it move, including the transmission, engine, and shafts. Vehicles may be front-drive or rear-drive.
Emissions
An assessment of how many pollutants a car gives off that is measured by EPA standards. Emissions of common gasses must not exceed the maximum levels set by the EPA.
Engine Displacement
Previously measured in cubic inches and now designated in liters, displacement describes the volume of combustion in the engine’s interior.
Fuel Economy
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How far a vehicle can travel using a given amount of gasoline. Commonly described in miles per gallon and measured for city and highway driving.
Fuel Injection
A system that monitors how much fuel the engine needs and uses an injector to deliver a high-pressure fuel stream via a nozzle.
Gearbox
The system of cogs controlled by the manual or automatic shifter in a vehicle. The movement of each cog directly influences the movement of the car.
GPS
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A digital navigation system built into many modern vehicles that uses your current location to deliver the best route to a specific destination.
Handling
How well a vehicle moves on straightaways, around corners and over varying degrees of terrain.
Horsepower
A unit of measurement equal to 550 foot pounds per second used to describe the power of a vehicle’s engine. Higher numbers mean more power and the ability to push a car to faster speeds.
Ignition System
The system that creates and controls the timing of the spark necessary to start fuel combustion inside the engine.
Jump Start
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An emergency starting procedure used to get a car running when the battery is dead. Jumper cables are attached to the battery of a working vehicle and run to the failed battery to provide a jolt of power.
Keyless Entry
A modern entry system that unlocks doors via a battery-powered remote or key fob instead of requiring you to physically put the key into the lock.
Oil
Lubricant that reduces wear and tear on an engine’s moving parts, prevents overheating and delays the process of corrosion.
Powertrain
Also called the drivetrain, this system consists of the combination of the engine and transmission and is often protected by a manufacturer warranty.
PSI
Image courtesy of romana klee on Flickr.
Pounds per square inch, a measurement of pressure most often used to ensure that tires are properly inflated.
Service Book
A record book used to keep track of when service is performed on a vehicle. This is sometimes required in order for your car’s warranty to remain valid and may increase the value of a used car.
Supercharger
A compressor that delivers more air into the engine’s interior. The result is an increase in power but a decrease in fuel efficiency.
Tire Pressure
How much air is in a vehicle’s tires, expressed in pounds per square inch. Some cars have a monitoring system that alerts you to low pressure.
Traction Control
This safety feature minimizes wheel spin and ensures good traction between the tires and the road when a vehicle accelerates.
Transmission
Manual transmission with six gears and reverse. Image courtesy of Jalopnik.com.
The internal system that controls the power from the engine and translates it into movement via a manual or automatic shifting mechanism.
Turbocharger
Similar to a supercharger, this device increases vehicle power with the help of an exhaust-driven turbine.
VIN
A unique number known as the vehicle identification number that sets a vehicle apart as unique. Digits within the number describe various aspects of the vehicle.
Having this glossary on hand should make it easier to communicate with others about your own vehicle and to understand much of what you read about cars.
Are there any terms you find confusing that were left off this list?