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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
  • Repair any ECM related DTCs or symptoms before using this diagnostic.
  • This DTC may be stored as a history DTC without affecting the operation of the ECM or PTOM. Do not replace the ECM or PTOM if this DTC is stored only as a history DTC and is not retrieved as a current DTC.
  1. Engine ON, clear codes in the PTOM and then engage PTO. Verify that DTC P061C does not reset as current in the PTOM.
    • If the specified code sets as current, replace the ECM.
  2. If all circuits test normal, refer to Diagnostic Aids. Do not replace the PTOM.
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