Dashboard warning lights: which ones mean stop now and which can wait
Red and yellow dashboard lights decoded, with the right next step for each one
Your dashboard is how your car talks to you. Most of the time it has nothing to say. When a warning light does come on, it can be hard to know whether you have a dangerous problem or a loose gas cap.
This guide explains the common lights, what they usually mean and what to do. Lights and steps differ by vehicle, so your owner’s manual is always the final word. If you do not have a printed manual, most carmakers post them online.
The color code
Most carmakers use a simple color system:
- Red: a serious problem or a safety issue. Stop as soon as it is safe, or do not drive.
- Yellow or amber: something needs attention soon. You can usually keep driving with care to a shop.
- Green or blue: information only, such as headlights on or cruise control set.
Federal safety rules set colors for some lights. For example, the brake system warning light must be red. Red warning lights required by those rules cannot be turned off while the problem still exists [1].
Watch the lights at startup
When you turn on the car, many lights come on for a few seconds as a self check, then go out. In Kia models, for example, the air bag light should go out after about six seconds [2].
Two things to watch for:
- A light that stays on after the engine starts. Look it up.
- A light that never comes on during startup. Kia’s manual says to have the air bag system checked if its light does not come on at all [2]. A light that never shows cannot warn you.
Red lights: stop when it is safe
Comparison compiled by Safety Behind the Wheel Foundation
Red warning lights and what to do
| Light | What it usually means | What to do now |
|---|---|---|
| Brake warning, after the parking brake is released | Brake fluid may be low or the brake system has a fault. Braking may be weaker | Park in a safe place right away and call for service [3] |
| Brake and ABS lights together | Both the brakes and antilock system may have problems | Do not drive. Have the vehicle towed [3] |
| Oil pressure | The engine may not be getting enough oil | Stop safely and turn off the engine. Do not drive [3] |
| Engine temperature, or gauge in the red | The engine is overheating | Pull over, turn off accessories and follow the overheating steps below [4] |
| Battery or charging | The charging system has failed and the engine may stop | Pull off the road safely and call for service [3] |
| Air bag | The air bags may not deploy in a crash | Drive with care and have the system checked soon [2] |
| Seat belt reminder | Someone is not buckled | Buckle up before driving |
Source: Based on owner’s manual guidance from Mazda [3], Honda [4] and Kia [2]. Colors and steps differ by vehicle.
How to pull over safely
- Turn on your signal and check your mirrors.
- Move to the right shoulder or the nearest exit, parking lot or side street.
- Get as far from traffic as you can.
- Turn on your hazard lights.
- If you are on a busy highway with no safe shoulder, see our guide on breaking down in a live lane.
Yellow lights: get it checked soon
Comparison compiled by Safety Behind the Wheel Foundation
Yellow warning lights and what to do
| Light | What it usually means | What to do |
|---|---|---|
| Check engine, steady | The engine or emissions system has a fault | Get service soon. The car usually drives normally [5] |
| Check engine, flashing | A severe engine misfire | Reduce speed and get service as soon as possible [5] |
| ABS | The antilock feature may not work. Regular brakes usually still do | Have it inspected as soon as possible [6] |
| Tire pressure, steady | At least one tire is well below the right pressure | Check all tires with a gauge and fill them [7] |
| Tire pressure, flashing then steady | The monitoring system has a problem | Have the system checked [7] |
| Stability or traction control | Flashing often means the system is working. Steady can mean it is off or has a fault | Drive gently and check your manual |
| Power steering | The steering assist has a problem and steering may be heavy | Stop in a safe place and call for service if it stays on [3] |
| Low fuel, washer fluid or maintenance due | A reminder | Fill up or book service |
Source: Based on EPA [5], AAA [6], NHTSA [7] and Mazda [3] guidance. Colors and steps differ by vehicle.
The check engine light, explained
The check engine light is the one drivers worry about most, and the one they most often ignore. It can mean anything from a loose fuel cap to a serious engine problem [8].
Steady light. EPA says a steady light is meant to tell you the car needs service, not that you need to stop [5]. Note how the car is running and book a visit soon. Ram’s manual warns that driving for a long time with the light on can damage the vehicle’s control system [9].
Flashing light. EPA says a flashing light means a severe engine misfire. Slow down and get service as soon as possible, because even a short time with a severe misfire can seriously damage emission control parts [5]. Ram’s manual warns that a flashing light can mean serious catalytic converter damage and power loss will soon occur [9].
Loose fuel cap. A cap that is not fully tightened can turn on the light. EPA says that after you tighten it, the light should go off within a few days [5].
A few more tips:
- Do not park on dry grass if the check engine light is flashing. Ram’s manual warns that a malfunctioning catalytic converter can get hot enough to start a fire [9].
- Do not disconnect the battery to clear the light. Mazda warns against this [8]. It erases information a technician needs.
- Ask for the code. Many auto parts stores will read the trouble code for free. The code helps you ask the shop better questions, though it does not always pinpoint the exact repair.
If your engine overheats
Honda’s manual gives clear steps that match common guidance [4]:
- Pull over safely as soon as you can. Turn off accessories and turn on your hazard lights.
- If steam or spray is coming from under the hood, turn the engine off and wait. Do not open the hood until the steam stops.
- If there is no steam, open the hood and check that the cooling fan is running. Turn the engine off once the gauge drops, or right away if the fan is not running.
- After the engine cools, check the coolant level and look for leaks.
- Never remove the radiator cap while the engine is hot.
- If the gauge stays high after you restart, have the car inspected.
Warning signs with no warning light
Some of the most important warnings never show on the dashboard. Trust your senses.
Comparison compiled by Safety Behind the Wheel Foundation
Warning signs you can see, smell or feel
| Sign | What it may mean | What to do |
|---|---|---|
| Gasoline smell that lingers | A fuel leak, which is a fire hazard | Turn the engine off. No smoking or flames nearby. Have it towed [10] |
| Exhaust smell inside the car, or headache and dizziness while driving | An exhaust leak letting in carbon monoxide | Open the windows, stop driving and get fresh air. Have the exhaust checked [11] |
| Burning smell and smoke from one wheel | A stuck brake | Stop and let it cool. Have it towed [10] |
| Sweet smell or steam | A coolant leak | Pull over and follow the overheating steps |
| Brake pedal sinks or feels soft | A brake fluid leak or brake fault | Stop when safe. Have it towed |
| Grinding when braking | Brake pads worn to metal | Have it inspected right away [6] |
Source: Based on Federal Trade Commission [10], CDC [11] and AAA [6] guidance.
Carbon monoxide has no smell or color. The CDC recommends having your exhaust system checked every year and never running a vehicle in an attached garage [11]. Early symptoms of poisoning feel like the flu: headache, dizziness, weakness, upset stomach and confusion [11].
When a warning light comes on
Frequently asked questions
Can I drive to the shop with the check engine light on?
If it is steady and the car runs normally, usually yes. Get it checked soon [5]. If it is flashing, the car runs poorly, or other red lights are on, slow down and get help right away.
Why did my tire pressure light come on when it got cold?
Cold air lowers tire pressure. NHTSA says the light may come on during a cold morning and go off once the tires warm up [7]. That means the pressure is borderline. Fill the tires to the number on the door label.
The light came on and then went off. Should I worry?
It depends on the light. Some faults come and go. Many cars store a record of the problem. Mention it at your next service, and sooner if it was a red light.
My car shows a message instead of a light. Is that the same?
Many newer cars use text messages on a screen along with, or instead of, warning lights. Read the message and look it up in your manual.
Related articles
- Vehicle maintenance for safety: tires, brakes, lights and warning signs
- Brake, steering and suspension parts: warning signs, quality replacements and installation
- Car diagnostic scanners and inspection tools: what a code reader can and can’t tell you
- Antilock brakes and electronic stability control: how they work and what the lights mean
- Breaking down in a live lane: what to do when your car stops on the highway
Sources and further reading
- 1Code of Federal Regulations. 49 CFR 571.101, Standard No. 101; Controls and displays. 2020 edition. govinfo.gov/…/CFR-2020-title49-vol6-sec571-101
- 2Kia owner’s manual. Air bag warning light. ownersmanual.kia.com/…/t00075.html
- 3Mazda. 2025 CX-5 owner’s manual, Stop Vehicle in Safe Place Immediately. mazdausa.com/…/08070301.html
- 4Honda owner’s manual. If the engine overheats. honda.ca/…/GUID-90619085-63C6-41D9-AA72-748
- 5U.S. Environmental Protection Agency. On board diagnostics (OBD) frequently asked questions for consumers (archived). webarchive.library.unt.edu/…/obd-faq.pdf
- 6AAA. 5 Ways to Know You May Need Brake Repair. aaa.com/…/5-Ways-To-Know-You-May-Need-Brak
- 7NHTSA. Tires. nhtsa.gov/vehicle-safety/tires
- 8Mazda. CX-30 owner’s manual, Check Engine Indication/Light. owners-manual.mazda.com/…/08070314.html
- 9Ram. 2022 Ram 2500/3500 owner’s manual, Engine Check/Malfunction Indicator Warning Light. vehicleinfo.mopar.com/…/GUID-F1C2D92A-05FC-41AF-B9A0-287
- 10Federal Trade Commission. Auto Repair Basics. consumer.ftc.gov/…/0211-auto-repair-basics
- 11Centers for Disease Control and Prevention. Carbon Monoxide Poisoning Basics. cdc.gov/co/faqs.htm
This article reflects the safety priorities of vehicle maintenance and breakdown prevention. It is general education, not mechanical advice. Warning lights and steps differ by vehicle, so follow your owner’s manual and see a qualified technician. Reviewed November 2026.
Special thanks to our contributors
We appreciate the professionals, experts, and community members who share their knowledge and perspectives to help make this resource better. Your insights are always welcome and appreciated.
Have professional expertise, firsthand experience, or a perspective that could make this resource better?
We welcome your input. Your knowledge and experience can help us make this resource more useful, accurate, and meaningful to the people who rely on it.
Thank you. Your contribution is on its way.
We’re grateful you took the time to share your knowledge with us. Our team reviews every contribution with care. If it helps improve this resource, we’ll update the page and recognize you the way you chose.
Keep learning
Safe Driving Resource Center
Guides, self-checks and articles for drivers, parents of new drivers, and families recovering after a crash.
