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Ron
Ron, ASE Certified Technician
Category: GMC
Satisfied Customers: 35063
Experience:  35 years in the Automotive repair business.
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Submitted: 1 year ago.
Category: GMC
Expert:  Ron replied 1 year ago.
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
The code P1125 can be set due to any of the following,
Accelerator Pedal Position (APP) Sensor
Connection
Throttle Actuator Control (TAC) Module
Wire
SInce replacing the APP did not resolve the problem then you are going to need to do some testing, I have enclosed the steps in the link below. Copy and paste the link to your browser to open and view it.
https://dl.dropboxusercontent.com/u/104923897/P1125%20Aug%201.pdf