Ok so I got reduced engine power on my vehicle and I was unable to drive it faster than 5 mph. Throttle body and pedal sensor was replaced. 3 weeks passed and the problem came back except this time I could accelerate up to about 30 mph. This persisted and the throttle body and pedal sensor has been replaced 4 times. In addition the wiring harnesses, ground wire, and alternator has been replaced as well. This worked for about a week and the reduced engine power has come back again. Any suggestions?

 

Knock sensor maybe? Ive heard of that happening with earlier models like 04 and 05

 

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I’m sorry you are experiencing this issue with your vehicle. What year is the vehicle? Where was the work performed?

Louis
GM Customer Service