P0838

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





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

- When Monitored:
With the ignition on.

- Set Condition:
The (K77) Transfer Case Position Sensor Input circuit is shorted to ground.





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

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

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. With the scan tool, read Cluster DTCs.

Does the scan tool display DTC: P0838-FOUR WHEEL DRIVE (4WD) SWITCH CIRCUIT LOW 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.