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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 503 (Transfer Case - Mp 3023/3024 (NQH)) >> Diagnostic Information and Procedures >> DTC C0550 >> Circuit/System Verification

Circuit/System Verification

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  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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