Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. What Does It Mean When the Dashboard Warning Lights Blink?

What Does It Mean When the Dashboard Warning Lights Blink?

warning lights blink

Your vehicle's onboard diagnostic system (OBD II) monitors other onboard systems to communicate vital information to you. For most vehicles, the only way the car can deliver that information is through dashboard warning lights (some new, high-end vehicles can use the infotainment system to communicate some information). It’s important that you know what each light on your dashboard indicates, and what it means when they light up.

What does it mean when the dashboard warning lights blink?

There’s no single answer as to why a dashboard warning light might blink. Each light in your dash is tied to a different system. The OBD II system on your car only controls the Check Engine Light, for instance. The ABS system is tied to the ABS light. The tire pressure monitoring system uses the TPMS light (which might spell out TPMS, or might be a picture of a tire). What’s more, there are different types of flashes that you should know.

  • Brief flashing during engine startup and then off: It is normal if your dash warning lights flash briefly right after cranking your engine and then turn off. Each system performs a self-check when you turn on your car. The lights turn off after verifying that the systems are operating.

  • Flashes and then stays on: If one of your dash warning lights flashes briefly and then stays on, it means there’s a problem with whatever system that light is tied to. For example, your Check Engine Light might flash and then stay lit if there’s a misfire in the engine, or if one of your oxygen sensors has failed.

  • Flashes without stopping: Generally, only the Check Engine Light will flash constantly, and only if the OBD II system detects multiple issues. Constant flashing could indicate any variety of problems, so it's safest to avoid driving and have a mechanic inspect your car as soon as possible.

There are other lights that might flash without stopping, including the following:

In the end, whether a warning light comes on or stays on, or starts flashing, it’s an indication that there is a problem, and a potentially serious one (particularly with flashing dash lights). It’s important to have your vehicle inspected by a professional mechanic immediately.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP)...


Related questions

Q: Emissions light came on scanned car got p2180 then few days later on highway gas pedal radomly go out. Now won't kick over. What i

Hello, and thank you for writing in. The symptoms and the code that you have received are both synonymous with an issue with the mass airflow sensor, or a faulty oxygen sensor. Either way, between the two sensors and their...

Q: Dashboard lights not working

Hi. The common problem with dash lights going out is a power inverter malfunction. The only fix is to replace the whole dashboard. I would check the fuses for the dash lights first and if they are okay, the problem...

Q: Getting error code P0304

P0304 means the engine computer has detected a severe misfire on cylinder 4. This could be due to a bad ignition coil, spark plug, fuel injector, or valve train issue. If the issue is not resolved, further damage to the...