Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Test
- 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.
- Ignition on, engine not running.
- With the scan tool, clear Stored DTCs in the DTCM and the CCN.
- Test drive the vehicle.
- During the test drive, move the Transfer Case Selector Switch (if equipped) to each position several times in accordance with the Service Information.
- 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
- With the scan tool, monitor the ambient temperature in the Body Control Module (BCM).
Is the ambient temperature at room temperature?
Yes
- Go To 3
No
- Replace the Ambient Temperature Sensor in accordance with the Service Information.
- Perform the TRANSFER CASE VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- With the scan tool, monitor the ambient temperature in the Body Control Module (BCM).
- TRANSFER CASE SELECTOR SWITCH
- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors relative to this circuit.
- 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 CONTROL NODE
- Turn the ignition off to the lock position
- Replace the Transfer Case Selector Switch (if equipped) in accordance with the Service Information.
- Ignition on, engine not running.
- With the scan tool, clear Stored DTCs in the CCN and the DTCM.
- Test drive the vehicle.
- During the test drive, move the Transfer Case Selector Switch (if equipped) to each position several times in accordance with the Service Information.
- 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.
- Perform the DTCM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
No
- Test complete.
- INTERMITTENT WIRING AND CONNECTORS
- The conditions necessary to set this DTC are not present at this time.
- Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors for corrosion, water intrusion, proper pin tension and bent or broken pins/terminal ends.
- Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
- Look for the data to change or for the DTC to reset during the wiggle test.
- While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
- 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.
NO RELATED
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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.