P0853-OVERDRIVE/TOW SWITCH INPUT CIRCUIT STUCK

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

Possible Causes
(T6) TOW/HAUL OD OFF SIGNAL SHORTED TO GROUND
SHIFT LEVER ASSEMBY
CLUSTER

1. CHECK FOR AN ACTIVE DTC

1.	Turn the ignition on.

2.	With the scan tool, record and erase DTCs.

3.	Wait 30 seconds.

4.	Press the TOW/HAUL switch three times.

5.	With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

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. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

2. SHIFT LEVER ASSEMBLY

1.	Disconnect the Shift Lever Assembly harness connector.

2.	With the scan tool, read DTCs.

Does the scan tool display the DTC as active?

Yes

Replace the Shift Lever Assembly in accordance with the service information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

3. (T6) TOW/HAUL OD OFF SIGNAL SHORTED TO GROUND

1.	Turn the ignition off.

2.	Disconnect the Cluster C3 harness connector.

3.	Measure the resistance between ground and the (T6) TOW/HAUL OD OFF signal circuit at the Cluster C3 harness connector.

Is the resistance below 10K Ohms?

Yes

Repair the (T6) TOW/HAUL OD OFF Signal Circuit for a short to ground.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

Replace the Cluster in accordance with the service information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).