What does a flashing check engine light mean?
Why flashing is more serious
A steady check engine light means the car has detected a problem that needs attention. A flashing light is more urgent because it often means misfires are happening often enough to send unburned fuel into the exhaust. That fuel can overheat the catalytic converter.
Many automakers recommend reducing speed and load and avoiding hard acceleration when the light flashes. Stop driving as soon as it is safe if the car runs rough or loses power.
- Reduce speed and avoid hard acceleration
- Stop safely if the engine runs rough
- Get the codes read as soon as possible
- Check your owner's manual for model specifics
What to do next
Have a shop or parts store read the codes. Misfire codes often start with P030 and then a cylinder number, though you should confirm the exact code. Common causes include worn spark plugs, failing ignition coils or fuel delivery problems.
Driving a long distance with a flashing light can turn a small repair into an expensive one. If you cannot get it checked soon, limit trips and keep speeds low.
- Get codes read the same day if possible
- Limit trips until it is repaired
- Note any rough running or power loss
Common mistakes
- Continuing to drive hard while the light is flashing.
- Clearing the code and assuming the problem is gone.
- Ignoring a flashing light because the car still seems to drive normally.
