Flash: Powertrain Diagnostic and System Improvements This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software.
A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the Technician may find one or more of the following Diagnostic Trouble Codes (DTCs) set in the PCM:
**JC Vehicles 3.6L:
· P0335 - Crankshaft Position Sensor Circuit. P2610 - PCM Internal Engine Off Timer Performance.
· U0140 - Lost Communication With Body Control Module (BCM).
· P0456 - Evap System Small Leak.**
JC Vehicles 2.4L:
· P0456 - Evap System Small Leak.
JS Vehicles:
· P0456 - Evap System Small Leak.
RT Vehicles:
· U0140 - Lost Communication With Body Control Module (BCM).
· P0456 - Evap System Small Leak.
The following transmission enhancements are also included in this software update:
· Garage shift engagements into D may be harsh at times after shutdowns of 10-30 minute duration.
· 5/6 Upshift timing adjusted to improve top speed performance (markets where speeds in excess of 161 kph (100 mph) are permitted).
