Diagnostic Test

VERIFY DTC IS ACTIVE 

1. Turn the ignition on.
2. With the scan tool, read active DTCs.

   Is this DTC active?

   Yes 

   • Refer to  DTC INDEX - 2500 HD  and perform the U0146-Lost Communication with Central Gateway diagnostic procedure.

   No 

   • Refer to  STORED LOST COMMUNICATION DTCS  and perform the Stored Lost Communication DTCs diagnostic procedure.