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?




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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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DTC P0120 P0220 P1516 P2135 these should be the problem codes.
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Throttle Actuator Control (TAC) System Description
All newer vehicles have this ! There are position sensors in the Gas pedal and on the throttle body on the engine , The computer uses a DC volt electric motor to make the vehicle go . The sensors wear over time , the motor can wear , wiring can break etc...
Reduced Engine Power Mode
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:
• Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The ECM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned off.
- Ignore the accelerator pedal input.
• 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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