Question about 2003 GMC Sierra 1500

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Where is the Reduced Engine POwer Sensor Located

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That is not what you are looking for. The issue is a decision by your engine management computer, based on some failure. What needs to happen is you pull the codes from the computer, requires a scanner, and proceed on the error codes.
Often a lube shop or parts store will pull the codes for free.
The issue is fairly significant if the systems reduced power. Pull the codes and begin there.

Posted on Dec 31, 2010

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Posted on Jan 02, 2017

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Why does my engine light come on occasionally with the reduced power sign


Condition:
Some customers may comment on an intermittent MIL/SES light Illuminated with a message center or an indicator that displays Reduced Engine Power. DTC P2138 - Accelerator Pedal Position (APP) Sensor 1-2 Correlation may be set. The voltage difference between APP sensor 1 and APP sensor 2 exceeds a predetermined value for more than 2 seconds. Refer to DTC P2138 in SI for further diagnostics.

Cause:
On some vehicles, the IP to body harness connector, which carries the APP signal to the ECM/PCM, is located in the left hand kick panel area and if the kick panel is not sealed properly, water enters and causes a short in the APP circuits setting a P2138 code.

Correction:
Important: Do Not replace the accelerator pedal assembly.

Locate the IP to body harness connector, which may be located in and around the left hand kick panel area. Check to see if there is a water leak into the area and repair as necessary.

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