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Home >> Cadillac >> 2021 >> XT5 Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 823 (Transfer Case - Mp 3023/3024 (NQH) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC C05FF or C15AC >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Refer to the Diagnostic Aids in the list above before performing the Circuit/System Verification below.

  1. Ignition - On/Vehicle - In Service Mode
  2. Verify there are no other DTCs set, except for DTC C05FF, C15AC.
    • Go to next step: If no other DTCs are set 
  3. Verify DTC C05FF, C15AC is not set.
    • If the DTC is set 
      • NOTE:

      The Range Actuator Learn Test does not have a parameter that indicates that the learn process have completed successfully

    1. Perform the following learn procedure: Transfer Case Range Actuator Learn 
    2. Ignition/Vehicle - Off
    3. Disconnect the data link connector.
    4. Wait 30 s before proceeding to the next step.
    5. Ignition - On/Vehicle - In Service Mode
    6. Was the learn procedure completed successfully as per the Transfer Case Range Actuator Learn?
      • If the procedure was successful

        All OK.

      • Go to next step: If the procedure was not successful
        • NOTE:

        If the learn was not completed successfully, refer to the Diagnostic Aids above before taking the next step.

    7. Test or replace the component: A16 Transfer Case Motor
    • Go to next step: If the DTC is not set 
  4. All OK.
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