NGC

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





For complete wiring diagrams refer to Diagrams/Electrical.


- When Monitored:

With the ignition on, battery voltage between 9 and 16 volts, and engine run time greater than 3 seconds.

- Set Condition:

The PCM doesn't receive a bus message from the Vehicle Security Control Module (SKREEM) for a specific amount of time.






Diagnostic Test

1. ACTIVE DTC

NOTE: For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.

NOTE: Check the IOD fuse before continuing. If the fuse is open, check the circuit for a short to ground.

Turn the ignition on.
With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Refer to Communications.

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Checking for an Intermittent DTC
- Perform the PCM Verification Test. PCM Verification Test