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Home >> GMC >> 2014 >> Sierra 2500 HD SLT, 6.6L Eng VIN 8, RWD >> Repair and Diagnosis >> Engine Mechanical >> Power Takeoff >> Power Take-Off System >> Diagnostic Information and Procedures >> DTC P061C: Control Module Engine Speed >> Circuit/System Verification

Circuit/System Verification

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, press 1 on the PTO switch to engage PTO. The engine RPM should increase to the default engine speed within a few seconds. Press RES + to increase the engine speed and SET - to decrease the engine speed accordingly.
  2. 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. Do not replace the PTOM.
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