Flash: Transmission Shift Enhancements This bulletin involves selectively erasing and reprogramming the...

Bulletin number

21-017-14

Component

Electrical system

Summary

Flash: Transmission Shift Enhancements This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) and Transmission Control Module (TCM) with new software. NOTE: Both the PCM and TCM must be up to date for these changes to be effective. The customer may indicate that they are not satisfied with the shift quality of the transmission. Improvements to the transmission calibration have been made to the following: Upshift Improvements ? Shift quality in Normal Mode ? Shift quality in Sport Mode ? Shift inhibit while transitioning in/out of MDS Downshift Improvements ? Downshift quality while accelerating ? Downshift quality while coasting General Improvements ? Torque converter clutch control during interlocked downshifts ? Torque converter clutch control during accelerator pedal tip in/out ? High speed gear hunting (shifting back/forth repeatedly between two gears) ? Allow 3rd gear launch at high altitude while in Snow Mode ? 2nd gear launch quality in ECO mode

Owners of these vehicles have filed 485 complaints in the electrical category.