Question about 2002 Chevrolet TrailBlazer

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The reduce engine power plus service engine soon light comes on had throttle body replaced and codes cleared problems still exist.

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  • Jerry Van Sickle Mar 11, 2011

    Hello hoggle1974,

    What were the original codes and are there any current codes?

    Regards,
    netvan

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  • Chevrolet Master
  • 540 Answers

The problem is usually find is a broken wire in the harness near the throttle body leading to the throttle body connector, most of the time the wire won't look broken but when you put tension on it then the sheathing will break. most of the time it is the yellow wire. it is a very common problem on these, and I see alot of un needed throttle body replacements

Posted on Mar 11, 2011

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When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
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• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
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• Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.
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I work at a chevy dealer an can not believe the one you took it to can't find the problem . Where is this dealer ? I will have a long talk with my district rep.
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