Check Engine Light Flashing Car Shaking

Flashing light plus shaking engine is the most urgent combination of symptoms your car can produce. Pull over now.

A flashing check engine light combined with engine shaking means you have a severe misfire — one or more cylinders are not firing, and unburned fuel is destroying your catalytic converter in real time. The shaking happens because the engine is running on fewer cylinders than it should, creating an imbalance. This is not a "drive it to the shop" situation. Pull over, turn the engine off, and call for help. Every minute of driving multiplies the damage.

The most common causes of a severe misfire are a failed ignition coil (the coil that creates the spark for one cylinder dies), a spark plug that has completely worn out or fouled, a fuel injector that stopped working, or a significant compression loss in one cylinder. The good news is that ignition coils and spark plugs are relatively inexpensive and quick to replace. The bad news is that if you drove too long with the flashing light, the catalytic converter may also need replacement.

Ez Mobile Mechanic treats flashing check engine lights with car shaking as emergency calls in Jacksonville. As a mobile mechanic in Jacksonville, we come directly to where you've pulled over. Don't restart the car, don't try to limp it anywhere. We bring ignition coils, spark plugs, and diagnostic tools. No tow truck needed — we come to you. Call (904) 788-7272 right now.