P0838

P0838-FOUR WHEEL DRIVE (4WD) SWITCH CIRCUIT LOW





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Ignition on.

- Set Condition:
The Transfer Case Position Sensor Input circuit voltage is below a specified value for a calibrated amount of time.





1. CHECK FOR ACTIVE DTC
1. Turn the ignition on.
2. Using the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

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.

2. TRANSFER CASE SELECTOR SWITCH
1. Turn the ignition off.
2. Disconnect the Transfer Case Selector Switch harness connector.
3. Turn the ignition on.
4. Using the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 3

No

- Replace the Transfer Case Selector Switch.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. (K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Disconnect the Cluster C3 harness connector.
3. Measure the resistance between ground and the (K77) Transfer Case Position Sensor Input circuit.

Is the resistance less than 5.0 Ohms?

Yes

- Repair the (K77) Transfer Case Position Sensor Input circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Cluster.
- Perform the BODY VERIFICATION TEST. Body Verification Test.