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2004 gt accelerator position problem with codes p1125, p2120, p2138

2

2004 GT GIRL

New member
Recently replaced the acceleration pedal in my 2004 GT after receiving the reduced engine power light. The car continues to cut off. The diagnostics codes that come up are P1155, P2120, P2138. Please help, I don't want to get rid of this vehicle.
 


Well the first code is for the O2 sensor, most likely unrelated.

The second two codes are the throttle position sensor/accelerator pedal position sensor...

First step is look at the accelerator pedal harness, see if you can find any damaged or broken wires, then check to see if it's plugged in properly, wiggle the connector around, unplug it and clean any dirt/corrosion out of it...

If that doesn't help, it could be the harness or connection at the throttle body, or the throttle body itself. If working the connector on and off a few times doesn't help, it's time to replace the throttle body. It does go bad sometimes.

You can get one from a jy for pretty cheap usually, any 04 and up Grand Prix with the V6, supercharged or not, will work. I believe there's even a few for sale on here for about 50 bucks.
 
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