Flash: Transmission Shift And Drivability Enhancements

Bulletin number

21-024-15 REV D

Component

Electrical system

Summary

Flash: Transmission Shift And Drivability Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available 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): ? P0711 - Transmission Fluid Temperature Sensor A Circuit Range-Performance. ? P1CC9 - Unable to Engage Gear. ? P1D98 - Incorrect Gear Ratio Clutch B or D Defective. ? P1DAD - Input Shaft-Output Shaft Direction Correlation. ? U1424 - Implausible Engine Torque Signal Received. In addition, the customer may also experience one or more of the following transmission related conditions: ? Garage Shifts (Shifting from Park or Neutral into Drive or Reverse). ? Harsh 1-2 upshifts. ? Less than desired accelerator pedal response in Sport and Traction Plus modes. ? RPM flare at engine start. ? Less than desired idle performance when shifting into DRIVE or REVERSE following a cold start. The following enhancements are included in the software update: ? Vehicle performance enhancements. ? Improve transmission shift enhancements for sand and snow mode. ? Improved paddle shifter operation.

Owners of these vehicles have filed 48 complaints in the electrical category.