3 weeks ago I replaced my throttle body, engine oil sensor & Accelerator Pedal Position Sensor because when I would come to a stop, my truck wouldn't move, engine light would come on and the message would say "engine power reduced".
Same problem has come back "AGAIN" so what now? PLEASE HELP!
Thanks

 

It is the ECM, covered by Federal Emissions Warranty of "8 year / 80,000 mile", so if your vehicle is less than 8 year old and under 80,000 miles take it to a GM Dealership and tell them about the problem and mention the warranty. Cost for replacement ECM AND any diagnostic work is covered, cost is ZERO to you.

 

FYI, the Throttle Body is also covered by the warranty, or so I was told by the dealership that fixed my G6, though my issue was the ECM.