Dashboard symbols and warning lights: what they mean
Dashboard symbols follow a color code, like a traffic light. A red warning light means a serious problem: stop as soon as it’s safe and check the owner’s manual. A yellow or amber light means something needs attention soon. Green, blue, or white lights only tell you a system is on, like the headlights or cruise control. The exact symbols differ by carmaker, so your owner’s manual is the final word.
On this page (10 sections)
The short answer: what the colors mean
| Color | Meaning | What to do |
|---|---|---|
| Red | Danger or risk of serious damage | Stop when it’s safe, turn off the engine if the manual says so, and read the manual. Don’t keep driving. |
| Yellow or amber | Caution: a system is outside its normal range or has a fault | Drive carefully and get it checked soon. A flashing yellow light can be urgent; see the manual. |
| Green | A system is on and working | Nothing; it’s information |
| Blue | Used for specific lights, most often the high beams | Nothing; dim the high beams for other drivers |
| White | General information | Nothing |
Colors per the international standard for vehicle symbols (ISO 2575) and Consumer Reports. Some carmakers use colors differently; check your manual.
In the U.S., the federal rule for dashboard controls and lights (FMVSS 101) sets the color of the main warning lights it lists, and says other lights may not use a color that hides them. Mazda’s 2026 CX-50 owner’s manual puts the general rule plainly: if a warning light turns on or flashes, park in a safe place and take the action the manual gives for that light; if it stays on or comes back, see a dealer.
Red lights: stop when it’s safe
| Light | What it means | What to do |
|---|---|---|
| Oil pressure (oil can) | The engine isn’t getting enough oil pressure to lubricate itself | Pull over and shut off the engine as soon as it’s safe; have the car towed (Consumer Reports) |
| Engine temperature (thermometer in liquid) | The engine is overheating | Pull over, shut off the engine, and let it cool; don’t open a hot radiator cap; have the car towed (Consumer Reports) |
| Brake system (“BRAKE” or a circle with “!”) | The parking brake is on, the brake fluid is low, or the brake system has a fault | Release the parking brake. If the light stays on, don’t drive; see the brake section below |
| Charging system (battery) | The battery isn’t being charged while the engine runs | Turn off accessories you don’t need and get to a shop or a safe stop; the car can stall when the battery runs down |
| Air bag or seat belt | A fault in the air bag system, or a seat belt isn’t buckled | Buckle up. An air bag light that stays on needs a dealer visit soon, because the air bags may not work |
Symbols and colors vary by carmaker. Your owner’s manual lists every light in your car.
The oil pressure light is not the same as an oil change reminder. A wrench symbol or an “oil life” message only means service is due soon; see how to reset the oil light. For overheating and coolant service, see our coolant flush guide. A charging light can mean a weak battery or an alternator problem; our car battery guide explains the tests.
Yellow or amber lights: check soon
- Check engine (engine outline): the engine or emissions system found a fault. Steady or flashing changes how urgent it is; see the section below.
- Tire pressure (tire cross-section with “!”): a tire is about 25% or more under its recommended pressure. If it flashes at start-up and then stays on, the monitoring system has a fault. Full guide: tire pressure light.
- ABS: the anti-lock brake system has a fault. Have it checked soon. If the red brake light is on at the same time, don’t drive.
- Traction or stability control (car with wavy lines): it may flash for a moment while the system works on a slippery road. If it stays on, the system is off or has a fault; your manual says which.
- Power steering: the electric power steering has a fault, and steering may feel heavy. Drive carefully to a shop.
- Low fuel, low washer fluid, check fuel cap: simple reminders. Mazda’s 2026 manual, for example, has a separate “check fuel cap” light.
Green, blue, and white lights: a system is on
These are indicators, not warnings: headlights, turn signals, cruise control, fog lights, and the blue high-beam light. A turn signal that blinks faster than usual often means a bulb on that side is out.
Brake light on the dashboard
A red brake light on the dash has three usual causes:
- The parking brake is on. Release it fully. On cars with an electric parking brake, the switch may need a firm press or pull.
- The brake fluid is low. Fluid drops as brake pads wear, or because of a leak. Don’t just top it off and forget it; have the brakes checked. Our brake fluid guide explains the reservoir marks.
- A fault in the brake system.
Don’t drive the car if the red brake light stays on with the parking brake released, or the pedal feels soft or sinks. Mazda’s owner’s manual warns that the brakes may not work normally in that case. Have the car towed. A yellow ABS light alone points to the anti-lock part of the system. Your manual says how to drive until it is fixed; get it checked soon.
Check engine light: steady or flashing
The check engine light (also called the malfunction indicator lamp) is tied to the engine and emissions controls. The cause can be minor, like a loose gas cap or a failed sensor, or serious. This guide doesn’t diagnose codes; a shop can read the stored code with a scan tool.
- Steady: Consumer Reports says if the car seems to run normally, drive to a shop soon. Waiting can let a hidden problem damage the catalytic converter.
- Flashing: Consumer Reports advises pulling over and having the car towed to a repair shop. A flashing light usually points to a problem that can quickly cause damage.
If the gas cap was loose, tighten it until it clicks. The light may take several drives to go off on its own.
Lights that come on when you start the car
When you turn the car on, many warning lights glow for a few seconds as a bulb check, then go out. That is normal. FMVSS 138, for example, requires the tire pressure light to light up this way so you know the bulb works. A light that stays on after the engine starts is a real warning. If a warning light never comes on during that check, its bulb or display may have failed; mention it at your next service.
What to write in your log
When a warning light comes on, note it in your car maintenance log:
- The date, odometer, and which light (color, steady or flashing)
- What the car was doing (cold start, highway, after a fill-up)
- The code the shop read, if any, and what was fixed
- The cost
A light that comes back months later is much easier to fix when the shop can see the first visit.
FAQ
What do the colors of dashboard lights mean?
Red means a serious problem: stop when it’s safe. Yellow or amber means check soon. Green, blue, and white mean a system is on, such as headlights or cruise control. Your owner’s manual lists every light in your car.
Which dashboard lights mean stop driving right away?
Red lights, especially oil pressure, engine temperature, and the brake light with the parking brake released. A flashing check engine light is also urgent. Pull over when it’s safe, turn off the engine, and read the owner’s manual.
Can I drive with the check engine light on?
If it is steady and the car runs normally, Consumer Reports says to drive to a shop soon. If it is flashing, pull over and have the car towed. Ignoring it can damage the catalytic converter.
Why does my brake light stay on?
Usually the parking brake isn’t fully released or the brake fluid is low. It can also mean a brake system fault. If it stays on with the parking brake off, don’t drive the car; have it towed and checked.
Why do all the dashboard lights come on when I start the car?
It is a bulb check. Most warning lights glow for a few seconds when you turn the car on, then go out. Any light that stays on after the engine starts is a real warning.
Sources
- ISO 2575:2021, Road vehicles — Symbols for controls, indicators and tell-tales (color meanings: red, yellow/amber, green, blue, white) (checked November 12, 2026): iso.org
- 49 CFR 571.101, FMVSS No. 101, Controls and displays (S5.4, telltale colors) (checked November 12, 2026): govinfo.gov
- 49 CFR 571.138, FMVSS No. 138, Tire pressure monitoring systems (25% threshold, malfunction light, bulb check) (checked November 12, 2026): govinfo.gov
- Consumer Reports, What the dashboard warning lights mean in your car (color code, oil pressure, temperature, check engine, tire pressure; updated April 23, 2026; checked November 12, 2026): consumerreports.org
- Mazda, 2026 CX-50 owner’s manual, warning lights (list of lights; park in a safe place) (checked November 12, 2026): mazdausa.com
- Mazda, 2026 CX-70 owner’s manual, brake system warning light (checked November 12, 2026): mazdausa.com