Dashboard warning lights tell you something needs attention right now
When a light appears on your dashboard, your car is sending you a message. Some lights mean you should pull over when ready. Others mean you have time to schedule a repair. The color and symbol tell you how urgent the problem is, and understanding the difference can save you money and keep you safe.
Your car's computer monitors dozens of systems — the engine, brakes, battery, oil pressure, tire pressure, and more. When something goes wrong, a light illuminates to alert you before the problem gets worse. Ignoring a warning light can lead to expensive repairs, a breakdown on the road, or a safety hazard.
Key Takeaways
- Red warning lights mean stop driving when ready and pull over safely; they signal brake failure, engine overheating, or low oil pressure.
- Yellow or amber lights indicate a problem that needs attention soon but is not an when ready safety threat; schedule a repair within days or a week.
- Green or blue lights are informational only and do not indicate a problem — they show that a system is active or available.
- Check your owner's manual or search your car's make, model, and year along with the light symbol to find the exact meaning for your vehicle.
- A flashing check engine light means the engine is misfiring and you should stop driving and have the car towed rather than continuing to a repair shop.
Red lights: pull over and stop driving
A red warning light is a stop sign. Pull over safely, turn off the engine, and do not restart it until you know what is wrong. Red lights almost always signal a problem that can damage your engine, fail your brakes, or leave you stranded.
The most common red lights are the oil pressure light (shaped like an oil can), the engine temperature light (shaped like a thermometer in a circle), and the brake system light (shaped like an exclamation point in a circle). Oil pressure loss means your engine is not getting lubricated and will seize within minutes of driving. Engine overheating means coolant is leaking or the cooling system has failed, and continuing to drive will warp the engine head. A brake light means your brakes may fail entirely.
If a red light comes on, turn off the engine, let it cool for a few minutes, and check your oil level with the dipstick under the hood. If oil is low, you may have a slow leak. If the engine is hot to the touch, you may have a coolant leak. In either case, do not drive the car — call a tow truck or a roadside service like AAA if you are a member.
Yellow and amber lights: schedule a repair soon
A yellow or amber light means something is not working as it should, but it is not an when ready safety threat. You have time to get the car to a repair shop, though you should not delay more than a few days.
The check engine light (a small engine symbol) is the most common yellow light. It turns on when the engine's computer detects a problem with emissions, fuel delivery, ignition timing, or another engine system. A flashing check engine light is different — it means the engine is misfiring (one or more cylinders are not firing correctly), which can damage the catalytic converter. If the light is flashing, stop driving and have the car towed. If it is steady, you can drive to a repair shop, but do not ignore it.
Other yellow lights include the battery light (a battery symbol), the tire pressure light (an exclamation point in a tire), the ABS light (the letters ABS), and the traction control light (a car with skid marks). A battery light means the charging system is not working and the battery will eventually drain. A tire pressure light means one or more tires are under-inflated, which wastes fuel and can cause a blowout. An ABS or traction control light means those safety systems are offline, though your regular brakes still work. Schedule a repair within a week.
Green and blue lights: these are not warnings
Green and blue lights are informational. They tell you that a system is on or available, not that something is wrong. You do not need to take action.
Common green and blue lights include the turn signal indicator (an arrow), the high beam indicator (a blue light or the letter H), the cruise control light (a speedometer symbol), and the seatbelt reminder (a person with a belt). These lights turn on and off as you use the features they represent. They do not indicate a problem.
How to find out what a specific light means
If you do not recognize a light, your owner's manual has a section that shows every dashboard symbol and explains what it means. The manual is usually in the glove compartment or available as a PDF on the manufacturer's website if you search by your car's year, make, and model.
You can also take a photo of the light and search online using your car's year, make, model, and the light symbol. Many repair shops and automotive websites have databases of dashboard lights. If you are unsure whether a light is red or amber (some dashboards are dim or have poor contrast), check the manual — the color matters for how quickly you need to act.
Some newer cars have a message on the dashboard that explains the light in words. If your car shows text, read it carefully — it may say something like "Engine Oil Pressure Low" or "Tire Pressure Low," which tells you exactly what to check.
What to do when a warning light comes on
First, note the color and symbol. If it is red, pull over safely and stop. If it is yellow, continue to a repair shop but do not delay. If it is green or blue, you can ignore it.
Second, check your owner's manual or search online to confirm what the light means. Some lights have obvious causes — a tire pressure light usually means you need to add air to a tire. Others require a mechanic to diagnose with a computer scanner.
Third, do not ignore the light hoping it will go away. Warning lights do not turn off on their own unless the underlying problem is fixed. Driving with a warning light on can make the problem worse and more expensive to repair. If you cannot get to a repair shop when ready, at least have someone look at the car within a few days.
When to call a tow truck instead of driving
Call for a tow truck if a red light comes on, if the check engine light is flashing, if you smell burning rubber or plastic, if you hear grinding or knocking from the engine, or if the car is pulling hard to one side. These are signs of serious problems that will get worse if you keep driving.
If you are not sure whether to drive or tow, err on the side of caution. A tow truck costs $75 to $150 depending on distance, but a seized engine or failed transmission can cost thousands to replace. If you are a member of AAA, roadside information through your insurance, or a car manufacturer's roadside program, the tow is usually covered.
Frequently Asked Questions
Can I keep driving if the check engine light is on?
If the light is steady, yes — you can drive to a repair shop, though you should not wait more than a few days. If the light is flashing, stop driving when ready and call a tow truck. A flashing light means the engine is misfiring and continuing to drive will damage the catalytic converter, which is expensive to replace.
What does the tire pressure light look like?
It is shaped like an exclamation point inside a tire. When it comes on, check the pressure in all four tires with a tire gauge (available at any gas station or auto parts store). Add air until each tire matches the pressure listed on a sticker inside the driver's door jamb or in your owner's manual. If the light stays on after you add air, you may have a slow leak and should have a mechanic inspect the tires.
Why did a warning light come on when I was driving normally?
Warning lights can come on for many reasons — a loose gas cap (which triggers the check engine light), cold weather (which lowers tire pressure), a weak battery, or a genuine mechanical problem. Check your owner's manual to understand what the specific light monitors, then have a mechanic diagnose it if the light does not turn off after a day or two.
Is it safe to drive with the ABS light on?
Yes, your regular brakes still work. The ABS (anti-lock braking system) helps prevent skidding on slippery surfaces, but without it you can still stop the car normally. Schedule a repair within a week, but you do not need to pull over when ready.
What if the same warning light keeps coming back?
A light that turns off and then comes back on again usually means the problem is not fully fixed or is getting worse. Have a mechanic scan the car's computer to read the diagnostic code, which pinpoints the exact cause. Do not ignore it — the problem will likely get worse and more expensive to repair.