I've got an '06 Grand Prix GT, 3800 w/SC. I get two fault codes. P1125 Throttle Position/Accelerator Pedal Position Sensor Ckt Problem. And, P2138 Accelerator Pedal Position Sensor 1-2 Correlation. The problem is intermittent and is accompanied by the Check Engine Light and an information center alarm "Reduced Engine Power" and then the car runs really rough at idle. I conclude from these two fault codes that the comparison of the postition of the gas pedal and the position of the throttle are in some sort of disagreement and the computer is flaging it. I'm assuming a lot when it comes to troubleshooting cars on fault codes alone, so whomever reads this please bear with me as I make educated guesses. I'm assuming that the electronic throttle control system works as follows and please correct me if I'm wrong. The gas pedal has a potentiometer built in to it and the signal is transmitted to the throttle positioning unit on the throttle body and the servo motor would then drive the throttle into the appropriate postion. Question is......do I replace the gas pedal assy and if that doesn't fix it replace the throttle assy?
Any help is appreciated.
Thanks!
