Flash: Powertrain Diagnostic and System Improvements This bulletin involves selectively erasing and...

Bulletin number

18-050-16

Component

Engine and engine cooling

Summary

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).

Owners of these vehicles have filed 412 complaints in the engine category.