Question about Chevrolet Silverado 2500HD

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2009 chevy silverado traction control light reduced engine power light and truck wont go over 25 miles per hour. If I pull over and shut engine down and i restart its ok for a few miles then starts the same thing over again

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DTC P1516 Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Your vehicle has an electronic throttle body unit so it uses voltage signals to control throttle blade in the throttle body. There are a few different issues that can cause this problem.

First off there is a update for the PCM to address those codes, but you will have to take it to the dealer for that.

Second there is issues with the actuator on the throttle body binding up and causing the codes.

Third there is a yellow wire coming off the throttle body connector that breaks inside internally and cannot be seen to the naked eye. The best way to test that is to grab the wire about 5 inches from the connector and tug if it feels spongy or breaks, that

Posted on Jan 01, 2011

  • ALEX MENA
    ALEX MENA Oct 24, 2013

    thats helpful is there any shops that do updates

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Posted on Jan 02, 2017

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1 Answer

Traction Control light is on and engine reduceing speed comes on screen.Code PO1125,PO420,PO446 are all present with the engine light on.HELP!


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It sounds like these things are all related. When the a computer sees a problem in the Electronic throttle system, it will dissable traction control, and give the reduced engine power alert because the powertrain computer does not know the value of throttle postion.
Codes will need to be scanned in the computersto begin diagnosis.
TechJK

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