Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the...

Bulletin number

21-008-21

Component

Power train

Summary

Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the 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 DTCs:P0732-00 - Gear 2 Shift Incorrect Ratio(Software Has Been Updated to Better Address This Concern). P0887-00 - TCM Power Control Circuit High. P1B13-00 - Park By Wire Unintended Out Of Park Position. P1DCD-00 - TCM Monitoring Processor Performance Multiple Clutches Locked Up. U0103-00 - Lost Communication With Electric Gear Shift Module. P1CC9 - Unable To Engage Gear. P1DDE-00 - Ignition Run/Start Input 1-2 Correlation. The customers may also experience the following:Harsh upshifts, 1-2, 2-3, 3-4, or 4-5. Harsh coasting downshift, while braking when the vehicle is near a complete stop. The following improvement is also included in this update:Shifter interlocking improvement in an event of brake signal loss to the TCM.

Owners of these vehicles have filed 474 complaints in the transmission category.