Codes P1125 and P2138 on 2004 Pontiac Grand Prix

Asked by Mar 01, 2015 at 03:12 PM about the 2004 Pontiac Grand Prix GT1

Question type: Maintenance & Repair

Get reduced engine power and traction control warning lights.  I've replace the pedal/position sensor and throttle body.

7 Answers

9,230

P1125 - Throttle Position Sensor Intermittent P2138 - Accelerator Pedal Position Sensor Circuit Looks like MAP sensor ... The Manifold Absolute Pressure sensor (MAP sensor)

3 of 3 people found this helpful.

Don't think it is the MAP but I pulled it off to check it. Came apart as I was pulling it out. Will replace and see. Had a lot of oily residue on the inside components.

MAP replaced. Still the same codes and reduced engine power and traction control warning lights. I can clear the codes but the come right back up when I put it in reverse.

Hey jerry did u get your problem solved?

No. Any advice uxw?

I'm having the same problems. Did you ever find a solution? I changed the throttle body and accelerator pedal sensor. didn't fix the issue.

I have a 2007 Grand Prix special edition. I have been dealing with these problems for about six years. I even took it to a GM dealership and it took them two weeks to figure the problem out. they said it was a circuit or a switch and about six months later low and behold reduced engine power. It doesn't happen all the time but I'm gave up on fixing it be haze not Evan a gm dealership could get it rite. Does anyone have a solution

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