Flash: MIL Illumination With Transmission And Driveability Improvements This bulletin involves flash...

Bulletin number

18-093-15

Component

Electrical system

Summary

Flash: MIL Illumination With Transmission And Driveability Improvements This bulletin involves flash reprogramming the Powertrain Control Module (PCM) with new software. The customer may experience a MIL illumination. Upon further investigation the technician may find that any of the following erroneous Diagnostic Trouble Codes (DTCs): ? U0140 - Lost Communication With Body Control Module. 2010 DJ 5.7L (Sales Code EZC) Attempting to clear this DTC will be unsuccessful. ? P050D - Cold Start Rough Idle. ? P2181 - Cooling System Performance has been set. ? P0935 - Line Pressure Sensor Circuit High. All RFE transmissions. P0300 through P0308 - Multiple and Single Cylinder Misfire. This condition can occur when the vehicle is started cold and the driver immediately places the vehicle in drive and applies heavy throttle. Driveability and Transmission improvements are also included with this software release. These changes consist of the following: ? Enhanced clutch protection for more robust torque management during repeated fore and aft movement (rocking vehicle). All engines. ? A revised torque convertor lockup schedule that will reduce transmission temperatures in Tow/Cruise mode. All models equipped with RFE transmission. ? A Clunk sound or feel a shudder when the cruise control resume switch is pressed. This condition is most noticeable after the brakes were pressed to cancel cruise control and then the resume switch is pressed. All models equipped with RFE transmission. ? A shudder or shaking feeling when a wide open throttle (WOT) event is performed by the customer. This is most noticeable after the transmission downshifts during the WOT event. This condition will stop once the transmission upshifts. All models equipped with RFE transmission. ? A shudder or shaking feeling when accelerating from a stop under moderate throttle. This condition will stop once the transmission upshifts. All models equipped with RFE transmission.

Owners of these vehicles have filed 240 complaints in the electrical category.