Question about 2003 GMC Sierra

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Tps I need to know what that is mean ? (p2135 -Accelerator pedal position potentiometer circut incorrect comparison between both tracks.) please .

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  • ama_aboali May 12, 2009

    I change the TPS & PCM & ECM , When I click on the throttle, engine speed does not increase what can do please?

    Best wishes

  • ama_aboali May 13, 2009

    dear sir

    I change the TPS on the throttle body and the accelerator

    pedal inside.and ECM. and When I click on the throttle, engine speed does not increase what can do? please.




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Your truck has an electronically controlled throttle system. There are (2) TPS sensors located on the accelerator pedal.
Both of the sensors must agree, by way of a voltage signal, to the current position of the throttle. If (1) of the sensors sends a different voltage signal back to the PCM than the other, the PCM will set this fault.
The reason for the (2) sensors is redundancy. In the event a sensor fails, the other will allow the engine to run and not leave you stranded.
A scan tool will be able to determine which sensor is out of sync and then can be replaced.
I hope this satisfies your question. Let me know.

Posted on May 12, 2009

  • Bruce Bracey
    Bruce Bracey May 13, 2009

    Did you change the TPS on the throttle body or the accelerator pedal inside.


  • Bruce Bracey
    Bruce Bracey May 14, 2009

    You will need to take it to your favorite vehicle technician who has a vehicle scanner. He will then look at the signal input from the accelerator pedal an see if he is receiving anything to the PCM. Also, he will be able to function the throttle with the scan tool to insure the circuit is correct and perform a PCM reset.

    The only other way would be to pin each wire out with a volt/ohm meter.

    Do you still have the old PCM?

    Good luck, let me know.




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