Chevrolet, GMC, Buick, Cadillac Warning Message
“Engine Power Reduced / Reduced Engine Power”
GM's fail-safe mode has activated, severely limiting throttle response and engine power. The vehicle may barely accelerate above idle speed. This is one of the most common and frustrating GM warnings.
high severity
Common Causes
- Throttle body failure (electronic)
- Accelerator pedal position sensor fault
- TAC (Throttle Actuator Control) module failure
- Wiring harness chafing or corrosion
- Coolant temperature sensor reading out of range
- Catalytic converter overheat protection
Immediate Action
Pull over safely if power is severely limited. A restart may temporarily restore power. Do not rely on this — the fault will return. Schedule immediate service.
Typical Repair Cost
$200–$1,500