2004 GMC Sierra "reduced engine power"

[bradshow]

Changed the throttle body and the MAF. Still getting the code above.

I guess I need to change those other sensors?


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[rjones916]

Did you look at my post earlier?

-Ryan

[bradshow]

Did you look at my post earlier?

-Ryan

My connectors and wires look really good. They're not discolored or brittle. Can I buy just a new connector?


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[bradshow]

Final fix was replacing the entire gas pedal assembly FYI


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[Bill Brollier]

Glad you finally fixed the problem.

[GT Drew]

Code P1125 is the code for the accelerator pedal position (APP) sensor. You confirmed the wiring and connectors were not broken. Why you replace all the other items, just a waste of money.

[Chris14]

I also have a 2004 GMC Serria 2500 6.0L and have had this p1125 codes so many times. I first started replacing the APP. The problem would go away for a week or 2 and would come back with the same code. So then I replaced the throttle assembley and would fix it again for just a few weeks. I was using aftermarket parts so then I went to my GM dealer and replaced both with GM parts. Problem gone for awhile then came back. I guy at the dealer said to replace the wiring harness at the throttle body and at the APP switch which this harness goes from the APP directly to the TAC Module. Still had a problem. The only other part left in that system is the TAC module so I replaced it with a GM part. Problem would still come back when you least expect it. Anyone have any help on what should seem to be a simple fix?? It seems like sometimes when you hit a bump just right it will set reduce engine power????