Dashboard Warning Lights: What Each One Means
Written by Muneeb Rana · Last updated 21 October 2026
Quick answer: Dashboard warning lights use a colour code. Red lights, such as oil pressure, coolant temperature, brake and battery, mean stop as soon as it's safe. Amber lights, such as check engine, ABS, tire pressure and traction control, mean get it checked soon. Green and blue lights only confirm a system is on.
TL;DR
- Red = stop when safe; amber = check soon; green/blue = information.
- Four red lights need immediate action: oil, temperature, brakes, battery.
- Look up your exact symbols in the owner's manual.
Dashboard warning lights are your car's way of telling you something needs attention. The good news: you don't need to memorise them. Learn the colour code, know the handful of red lights that mean stop, and look up the rest when they appear.
The colour code
| Colour | What it means | What to do |
|---|---|---|
| Red | Serious problem or safety risk | Stop as soon as it's safe and investigate |
| Amber / yellow | Something needs checking or a system is off | Get it checked soon; drive carefully |
| Green / blue | Information: a system is on | Nothing, unless it's unexpected |
Consumer Reports and the AA both use this rough traffic-light code to explain dashboard symbols, but symbols differ between makes, so check your owner's manual.
Common dashboard warning lights
| Check engine light | Amber/yellow | Steady: get it checked soon. Flashing: slow down and stop driving as soon as it's safe. | | Oil pressure warning light | Red | Stop as soon as it's safe and switch off the engine. | | Battery warning light | Red | Drive straight to a safe place or shop; the car may stop when the battery runs flat. | | Coolant temperature warning light | Red | Red: stop as soon as it's safe and let the engine cool. | | Brake warning light | Red | Check the parking brake; if it stays on, stop driving and get it checked. | | ABS warning light | Amber/yellow | Normal brakes should still work; get it checked soon and brake gently. | | Tire pressure (TPMS) warning light | Amber/yellow | Check tire pressures as soon as possible. | | Airbag warning light | Red or amber | Get it checked soon; the airbags may not deploy in a crash. | | Traction control light | Amber/yellow | Flashing briefly is normal; staying on means a fault or the system is switched off. | | Power steering warning light | Red or amber | Steering may become heavy; drive carefully to a safe place or shop. | | Glow plug light (diesel) | Amber/yellow | Normal at start-up; flashing or staying on while driving means a fault. | | DPF warning light (diesel) | Amber/yellow | Do a regeneration drive soon; if it stays on, get it checked. |
Red lights that mean stop
Four red warnings call for stopping as soon as it's safe: oil pressure (the engine is losing lubrication), coolant temperature (overheating), brake warning (if the parking brake is off) and battery/charging (the car may soon stop). Driving on with any of them risks expensive engine or brake damage, or a breakdown somewhere unsafe.
What to do when any warning light comes on
- Note the colour and whether it's steady or flashing.
- If it's red, or the car drives differently, find a safe place to stop.
- Look up the symbol in your owner's manual or the guides above.
- Get the fault code read for engine, ABS and airbag lights.
- Fix the cause, then record the date, mileage and repair.
Lights that are not warnings
Several symbols simply confirm a system is on: headlights, high beams, cruise control, eco mode, or a green glow-plug or start-stop symbol. Others, like the service due or oil change light, are reminders rather than faults. Use the car maintenance schedule to see what's due.
Keep a history of lights and repairs
Logging what lit up, when, at what mileage and what fixed it turns a confusing warning into a pattern you can act on. CarO keeps that history with the car repair log, next to your services and costs.
Download CarO free on the App Store or Google Play. Free with ads; optional in-app purchases.
Sources
- Consumer Reports: What the Dashboard Warning Lights Mean in Your Car: www.consumerreports.org (accessed 21 October 2026)
- The AA: Dashboard warning lights and what they mean: www.theaa.com (accessed 21 October 2026)
- AAA: The Check Engine Light, Common Causes and How to Fix It: www.aaa.com (accessed 21 October 2026)
- Consumer Reports: Tire Pressure Warning Light Came On? What to Do: www.consumerreports.org (accessed 21 October 2026)
Disclaimer: CarO and this website give general car-care information, not professional advice. Maintenance intervals and specifications vary by vehicle, so always follow your owner's manual and a qualified mechanic. Mileage and cost figures are estimates; check local tax rules before using any log for deductions.
FAQ
What do the colours of dashboard warning lights mean?
Red means a serious problem or safety risk, so stop when it's safe. Amber or yellow means get it checked soon. Green or blue lights only confirm a system is on.
Which dashboard warning lights mean stop driving?
Oil pressure, coolant temperature, brake warning (with the parking brake off) and a flashing check engine light. Stop as soon as it's safe and investigate before driving further.
Why are all my dashboard lights on?
All lights come on briefly at start-up as a bulb check. If several stay on while driving, it often points to a charging or electrical problem, such as a failing alternator or battery.
Can a warning light come on for no reason?
Lights can be triggered by a faulty sensor rather than the system itself, but you can't tell without a diagnosis. Have the code read rather than assuming it's a glitch.
Are dashboard symbols the same in every car?
The main ones are similar because of international standards, but details differ by make and model. Your owner's manual shows the exact symbols for your car.
Track this in CarO
CarO is a free car maintenance tracker app for iPhone and Android that keeps a full service history, reminds you about oil changes and inspections by mileage or date, and logs fuel fill-ups with MPG, odometer readings and car expenses for every vehicle you own. Logs are stored in the cloud and can be exported as CSV.
