Whether you’re buying your next vehicle or preparing to sell your current one, understanding automotive terminology can make the process much easier. If you’re researching your next purchase, be sure to visit our maintenance guidance hub where you’ll find expert advice on everything from inspections to paperwork.
To help you navigate the world of motoring, we’ve created this simple automotive jargon buster, explaining some of the most common terms you’ll come across.
Antilock Braking System (ABS)
An Antilock Braking System (ABS) prevents your wheels from locking during heavy or emergency braking. This helps maintain steering control, reduces the risk of skidding and can shorten stopping distances on many road surfaces.
Automatic Transmission
An automatic transmission changes gear for you, removing the need to operate a clutch pedal or manually select gears. It’s designed to provide a smoother and more relaxed driving experience.
AUX
AUX stands for Auxiliary Input. It allows you to connect external devices such as your smartphone, MP3 player or tablet directly to your car’s audio system using a cable.
Airbag
Airbags are inflatable safety devices designed to deploy during certain collisions. They help protect occupants by cushioning the impact and reducing contact with hard surfaces inside the vehicle.
Air Filter
The engine air filter prevents dust, dirt, debris and other contaminants from entering your engine. A clean air filter helps improve engine performance and fuel efficiency.
BHP
BHP stands for Brake Horsepower and measures an engine’s power output. In general, the higher the BHP, the greater the vehicle’s performance and acceleration potential.
Black Box Telematics
A black box telematics device records information about how a vehicle is driven, including speed, braking, acceleration and cornering. Insurance companies often use this data to calculate premiums, particularly for younger drivers.
Blind Spot Monitor
A blind spot monitoring system alerts you when another vehicle is travelling in an area that may not be visible in your mirrors. Some vehicles also feature Active Blind Spot Assist, which can automatically intervene if a collision is likely.
Chassis
The chassis is the main structural framework of a vehicle. It supports the engine, suspension, drivetrain and body, providing strength and stability while driving.
Coolant
Also known as antifreeze, coolant regulates your engine’s temperature by preventing it from overheating in warm weather and freezing during colder months.
Cross-Traffic Alert
Cross-Traffic Alert uses sensors to detect vehicles approaching from either side while you’re reversing out of a parking space, helping to reduce the risk of collisions.
Cruise Control
Cruise control automatically maintains a chosen speed without the driver needing to keep their foot on the accelerator, making long motorway journeys more comfortable.
Cut and Shut
A cut and shut vehicle is one that has been illegally rebuilt using sections from two or more damaged vehicles. These vehicles can present serious safety risks and should always be avoided.
Cylinder
The cylinders inside an engine are where fuel and air are compressed and ignited to produce power. The number and arrangement of cylinders affect an engine’s performance and efficiency.
Dampers (Shock Absorbers)
Dampers, commonly known as shock absorbers, are part of the suspension system. They help absorb bumps in the road, improving ride comfort and vehicle handling.
Drivetrain
The drivetrain includes all the components that transfer power from the engine to the wheels. This includes the gearbox, driveshaft, differential and axles.
Electronic Stability Control (ESC)
Electronic Stability Control helps prevent skidding by automatically applying braking to individual wheels when it detects a loss of traction or vehicle control.
EV
EV stands for Electric Vehicle. These vehicles are powered either entirely or primarily by electricity rather than petrol or diesel.
Full Service History
A Full Service History means a vehicle has been serviced regularly according to the manufacturer’s recommended schedule, with supporting invoices and service records.
Fuel Injection
Fuel injection is the system that delivers precisely measured amounts of fuel into an engine’s cylinders, improving efficiency, emissions and performance.
Front-Wheel Drive (FWD)
Front-wheel drive means the engine delivers power to the front wheels only. It is one of the most common drivetrain layouts in modern passenger cars.
GPS
GPS (Global Positioning System) enables satellite navigation, helping drivers find routes and receive live directions to their destination.
Gross Vehicle Weight
Gross Vehicle Weight (GVW) is the maximum permitted weight of a vehicle, including passengers, cargo, fuel and the vehicle itself.
Horsepower (HP)
Horsepower is a measurement of an engine’s power output. It indicates how much work an engine can perform and is commonly used alongside torque to compare vehicle performance.
HPI Check
An HPI Check is a vehicle history check that helps uncover important information about a used car, including whether it has outstanding finance, has been written off, stolen, or has mileage discrepancies. While HPI is a well-known provider, similar vehicle history checks are also available from other companies.
If you’re buying a used vehicle, it’s also worth reading our guide on Your Rights When Buying a Used Car, which explains what to look out for before handing over your money.
Hybrid
A hybrid vehicle combines a petrol or diesel engine with one or more electric motors. Depending on the type of hybrid, the vehicle may run on electric power alone for short distances before switching to the combustion engine.
Immobiliser
An immobiliser is an electronic security device fitted to most modern vehicles. It prevents the engine from starting unless the correct key or key fob is detected.
Jacked-Up
A “jacked-up” vehicle refers to one that has been raised higher than standard, usually by modifying its suspension. This is common on some off-road vehicles and pickup trucks.
Kerb Weight
Kerb weight is the weight of a vehicle with all necessary fluids and a full tank of fuel, but without passengers or luggage.
LED
LED (Light Emitting Diode) lights are commonly used in modern vehicles for headlights, brake lights and indicators. They are brighter, more energy-efficient and typically last longer than traditional bulbs.
List Price
The list price is the manufacturer’s recommended retail price (RRP) of a new vehicle before discounts or promotions are applied.
Marque
A marque refers to the make or brand of a vehicle, such as BMW, Audi, Mercedes-Benz or Ford.
MPG
MPG stands for Miles Per Gallon and measures how far a vehicle can travel using one gallon of fuel. Higher MPG figures generally indicate better fuel economy.
MPH
MPH stands for Miles Per Hour and measures the speed at which a vehicle is travelling.
Naturally Aspirated Engine
A naturally aspirated engine draws air into its cylinders without the assistance of a turbocharger or supercharger.
Odometer
An odometer records the total distance a vehicle has travelled throughout its lifetime.
Parking Sensors
Parking sensors use ultrasonic sensors mounted in the vehicle’s bumpers to detect nearby objects. As you get closer to an obstacle, the warning beeps become more frequent.
PSI
PSI stands for Pounds per Square Inch and is the unit used to measure tyre pressure.
Power Steering
Power steering uses hydraulic or electric assistance to reduce the effort needed to turn the steering wheel, especially at low speeds.
Range
Range refers to the maximum distance an electric vehicle can travel on a full battery charge before it needs recharging.
Road Tax Band
Road tax (Vehicle Excise Duty or VED) determines how much tax is payable based on factors such as emissions, fuel type and the vehicle’s registration date. Modern VED rules differ from the older A–M emissions bands, so charges now vary depending on when the vehicle was first registered.
Rear-Wheel Drive (RWD)
Rear-wheel drive means engine power is delivered solely to the rear wheels. This layout is often favoured in performance and luxury vehicles.
Statutory Off Road Notification (SORN)
A Statutory Off Road Notification (SORN) tells the DVLA that your vehicle is not being driven or parked on public roads. While a vehicle is declared SORN, you do not need to pay Vehicle Excise Duty (road tax).
Stop-Start Technology
Stop-start technology automatically switches off the engine when the vehicle is stationary, such as at traffic lights, before restarting it when you move off. This helps reduce fuel consumption and emissions.
Transmission
The transmission transfers engine power to the wheels. The most common types are:
- Manual
- Automatic
- Semi-automatic
- Continuously Variable Transmission (CVT)
Torque
Torque measures the rotational force produced by an engine. Higher torque generally provides stronger acceleration and better pulling power, particularly at lower engine speeds.
Turbocharger
A turbocharger compresses additional air into the engine, allowing more fuel to be burned and increasing both power and efficiency.
Valves
Engine valves control the flow of air and fuel into the engine while allowing exhaust gases to exit during combustion.
Vehicle Registration Mark (VRM)
The Vehicle Registration Mark (VRM) is your vehicle’s registration number, commonly referred to as the number plate.
Wheelbase
The wheelbase is the distance between the centres of the front and rear wheels. A longer wheelbase generally improves ride comfort, while a shorter wheelbase can improve manoeuvrability.
Written-Off
A vehicle is considered written off when an insurer decides that repairing it is uneconomical or unsafe. Written-off vehicles are placed into insurance categories depending on the level of damage sustained.
If you’re preparing to sell your current vehicle, it’s also worth reading up on How Your Car’s Service History Affects Its Value, which explains one of the biggest factors buyers consider.
Final Thoughts
Understanding common automotive terminology makes buying, owning and selling a car much less confusing. Whether you’re comparing vehicle specifications, reading service records or discussing repairs with a mechanic, knowing these terms can help you make informed decisions and avoid costly mistakes.
You can also learn more about the terminology used when Buying a Used Car, helping you feel more confident before making your next purchase.
Thinking About Valuing Your Car?
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To get your free valuation today with jamjar and discover how much your car could be worth, simply enter your reg number into our online valuation tool.