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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1605 (Transfer Case - Mp 1625/1626-NQF) >> Diagnostic Information and Procedures >> DTC C0550 >> Circuit/System Verification

Circuit/System Verification

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. Engine running. Let the engine run for at least 1 minute.
  2. Ignition OFF for at least 30 seconds to allow for the complete shutdown of the TCCM.
  3. Ignition ON. Verify that DTC C0550 is not set.
    • If DTC C0550 sets, reprogram the TCCM. If the DTC resets, replace the TCCM. Perform the ATC motor learn procedure.
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