This TSB provides information to diagnose the push button shifter operation. If you are servicing a vehicle with any symptoms listed below or DTCs (listed on Page 2) , follow the Service Procedure on Page 3. SYMPTOMS: ⢠âShifter System Malfunctionâ displayed in the cluster ⢠Wonât shift into or out of gear or wonât shift out of Park ⢠Incorrect gear display in cluster and/or wonât start