The 2022 Ram ProMaster City's flashing check engine light indicates severe misfires that can damage the catalytic converter. This requires immediate attention to prevent expensive secondary damage.
Flashing vs. Steady Light
A steady check engine light indicates a stored fault. A flashing light signals active, severe misfires where unburned fuel is reaching and potentially damaging the catalytic converter.
Causes of Severe Misfires
Ignition System Failure
Complete ignition coil failure or severely worn spark plugs can cause the type of misfire that triggers a flashing light.
Fuel Injector Failure
A completely failed injector (stuck closed) causes total misfire on that cylinder.
Major Mechanical Failure
Loss of compression from a failed head gasket, dropped valve, or timing issue causes severe misfire.
Fuel System Loss
Complete fuel pressure loss from pump failure or major leak causes all-cylinder misfire.
Immediate Action
When the light flashes, safely reduce speed and load. Continuing at full power accelerates converter damage. Have the vehicle diagnosed immediately.