U0168

U0168-LOST COMMUNICATION WITH VEHICLE SECURITY CONTROL MODULE (WCM)







- When Monitored:
With the ignition on.

Battery voltage between 10 and 16 volts.

Totally Integrated Power Module (TIPM) is configured correctly.

- Set Condition:
Bus messages not received from the Wireless Control Module (WCM) for approximately two to five seconds.





1. VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE

NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

NOTE: Check for any Technical Service Bulletins (TSBs) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.

1. Using the scan tool, read active DTCs.

Is this DTC active?

Yes

- Go To 2

No

- Stored Lost Communication DTCs Perform the Stored Lost Communication DTCs diagnostic procedure.

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTC'S
1. Using the scan tool, read active DTCs from all modules.

NOTE: Check for CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs to the conditions listed above?

Yes

- Go to and perform the appropriate diagnostic procedure.

No

- Go To 3

3. VERIFY THAT THE WCM IS ACTIVE ON THE BUS
1. Turn the ignition on.
2. Using the scan tool, select ECU View.
3. Verify that the WCM is active on the bus.

Is the WCM active on the bus?

Yes

- Go To 4

No

- No Response From WCM (Wireless Control Module) Perform the No Response from WCM diagnostic procedure.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTC'S
1. Using the scan tool, select Network View and select Advanced.

Is there more than one module with active DTCs "Logged Against" the WCM?

Yes

- Replace/update the Wireless Control Module.
- Perform the WCM VERIFICATION TEST. Wireless Control Module (WCM) Verification Test

No

- Replace/update the module that set this DTC.
- Perform the appropriate verification test for the module being replaced. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. Body Verification Test.