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DTC IS ACTIVE
NOTE:
Diagnose and repair any system voltage or Transfer Case related DTCs in the Drive Train Control Module (DTCM) before continuing with this test.
1. Ignition on, engine not running.
2. With the scan tool, clear Stored DTCs in the DTCM and the CCN.
3. Test drive the vehicle.
4. During the test drive, move the Transfer Case Selector Switch to each position several times in accordance with the Service Information.
5. With the scan tool, read DTCs in the DTCM and the CCN.
  Does this DTC reset?
  
  Yes
  - Go To 2.
  No
  - Go To 5.
AMBIENT TEMPERATURE SENSOR
1. With the scan tool, monitor the ambient temperature in the Totally Integrated Power Module (TIPM).
  Is the ambient temperature at room temperature?
  
  Yes
  - Go To 3.
  No
  - Replace the Ambient Temperature Sensor in accordance with the Service Information. Refer to SENSOR, AMBIENT TEMPERATURE , REMOVAL .
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
TRANSFER CASE SELECTOR SWITCH
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors relative to this circuit.
2. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4.
CLUSTER/CCN
1. Turn the ignition off to the lock position.
2. Replace the Transfer Case Selector Switch in accordance with the Service Information.
3. Ignition on, engine not running.
4. With the scan tool, clear Stored DTCs in the CCN and the DTCM.
5. Test drive the vehicle.
6. During the test drive, move the Transfer Case Selector Switch to each position several times in accordance with the Service Information.
7. With the scan tool, read DTCs in the CCN and the DTCM.
  Does this DTC reset?
  
  Yes
  - Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Refer to MODULE, DRIVETRAIN CONTROL , REMOVAL .
  - Perform the DTCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
INTERMITTENT WIRING AND CONNECTORS
1. Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors.
2. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
3. Look for the data to change or for the DTC to reset during the wiggle test.
4. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
5. Look for the data to change other than as expected or for the DTC to reset.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSFER CASE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Diagnostic Test

Use the Manual With the Right Hardware

When to See a Mechanic