18-063-14

Flash: 5.7L Powertrain Diagnostic And System Improvements This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software. The following powertrain system improvements/enhancements are included in this software release. These symptoms are broken down by vehicle. 2015 WK * Enhancements to improve a slight lag or hesitation during Multi Displacement System (MDS) mode transitions. * Enhancements to improve a slight drop in engine RPM when the vehicle is shifted to reverse or drive within 3 seconds of a cold start. * Malfunction Indicator Lamp (MIL) illuminated with Diagnostic Trouble Code (DTC) U0140-00 - Lost Communication with Body Control Module (BCM). 2014 WD * Enhancements to improve a slight drop in engine RPM when the vehicle is shifted to reverse or drive within 3 seconds of a cold start.