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Home >> Jeep >> 2007 >> Commander Overland, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> DTCS P3400 To U1403 >> U0168-Lost Communication With Vehicle Security Control Module (SKREEM-WCM) >> Diagnostic Test
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Diagnostic Test

  1. 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 DTC Active at this time? 

    Yes 

    1. Refer to DIAGNOSIS AND TESTING for diagnostic procedures and for further possible causes.

    No 

    1. Refer to INTERMITTENT CONDITION Diagnostic Procedure.
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