Rick's Free Auto Repair Advice

Posts Tagged: P2138

Reduced Engine Power

Reduced Engine Power light on and P2138 Reduced Engine Power trouble code The reduced engine power message appears on GM vehicles when the engine controls have detected a problem that can cause a safety issue. For example, the electronic accelerator pedal position sensor (APP) (fly by wire) sends multiple signals to the engine control to tell it how much and how fast to open the electronic throttle body. The APP has multiple potentiometers for redundancy. However, if the signals don’t correlate as the computer expects, it will reduce available engine power … Read More


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