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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 31 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0402-P2636)) >> DTC P2122, P2123, P2127, P2128, or P2138 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
    IMPORTANT: If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
  1. With the ignition ON, use a scan tool to observe the APP sensor 1 for a normal voltage range between 0.89-4.57 volts.
  2. With the ignition ON, use a scan tool to observe the APP sensor 2 for a normal voltage range between 0.41-2.19 volts.
  3. With the ignition ON, use a scan tool to compare APP sensors 1 and 2 percentages, verify they do not differ more than 2 percent during a full pedal sweep.
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