For a complete wiring diagram Refer to Section 8WWhen Monitored:With the ignition on.Set Condition:A communication error occurs between the ECM and SKREEM.Possible CausesINTERMITTENT DTCINCORRECT VIN PROGRAMMINGSKREEMENGINE CONTROL MODULE (ECM)Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)1. CHECK FOR SKREEM COMMUNICATION AND DTCSIgnition on, engine not running.With the scan tool, check for proper communication and active DTCs in the SKREEM.Are any SKREEM communication problems or DTCs present?YesRefer to the symptom list for problems related to SKREEM Communication and DTCs before continuing.NoGo To 22. CHECK FOR ACTIVE DTCTurn the ignition on.With the scan tool, clear all ECM DTCs.Turn the ignition on and off several times pausing 10 seconds between key cycles.With the scan tool, select View DTCs in the ECM.Is the status Active for this DTC?YesGo to 3NoRefer to *CHECKING FOR INTERMITTENT DTC in the symptom list.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)3. REPLACE THE SKREEM AND RETESTReplace and program the SKREEM in accordance with the Service Information.Turn the ignition on.With the scan tool, clear all ECM DTCs.Turn the ignition on and off several times pausing 10 seconds between key cycles.With the scan tool, select View DTCs in the ECM.Is the status Active for this DTC?YesReplace and program the Engine Control Module in accordance the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoTest complete.