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Reduced Engine Power 2004 Silverado

Layton McNally
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Layton McNally Enthusiast

Layton McNally

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I have a 2004 chevy Silverado 2500 with the 6.0 vortec. It throws codes p1516 and p2135 and puts itself in reduced engine power mode. It only seems to happen once the engine is up to operating tempature. I have replaced the throttle body twice. Replaced the throttle pedal position sensor, and searched for broken/ bad wires. I have tried cleaning grounds and other electrical connections and nothing seems to work. Does anyone have any suggestions or experience with this? Any help is much appreciated.

CamGTP Senior Enthusiast

CamGTP

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There could still be a problem with the TAC module if that code is still coming up. Was the entire pedal assembly replaced?

Layton McNally Enthusiast

Layton McNally

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18 hours ago, CamGTP said:

There could still be a problem with the TAC module if that code is still coming up. Was the entire pedal assembly replaced?

No I just replaced the sensor and used the old pedal. 

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