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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1660 (Engine Control System & Fuel System - 6.6L (LMM) - DTC P02E8 To DTC P1247) >> DTC P064C >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the glow plug control module.
  2. Measure and record the voltage between the battery positive voltage circuit terminal 1 of the X1 harness connector and ground. The voltage should be B+.
    • If voltage is not B+, repair the open or high resistance in the battery positive voltage circuit.
  3. Ignition OFF, disconnect the X2 harness connector at the GPCM.
  4. Ignition ON, measure and record the voltage between the ignition 1 voltage circuit terminal 52 and ground.
    • If voltage is not B+, test the ignition 1 voltage circuit for a short to ground or an open/high resistance.
  5. Ignition ON, measure and record the voltage between the ignition 0 voltage circuit terminal 53 and ground.
    • If voltage is not B+, test the ignition 0 voltage circuit for a short to ground or an open/high resistance.
  6. If all circuits test normal, replace the GPCM.
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