Flash: Transmission Shift and Diagnostic Enhancements
This bulletin involves flash reprogramming of the Transmission Control Module (TCM) with
new software.
NOTE: Vehicles that are being updated from TCM software p/n 682235$$AN or
682354$$AN ($$ are wild cards for any number) will not require the
transmission Adaptation Learn Procedure as indicated in Service Bulletin
21-013-13. However, vehicles that are being updated from any other TCM
software may require the transmission Adaptation Learn Procedure. Refer to
Service Bulletin 21-013-13 for detailed procedures. Failure to perform the
procedures outlined in Service Bulletin 21-013-13 on vehicles that were
updated from any other TCM software besides p/n 682235$$AN or
682354$$AN may result in undesirable shift quality.
Diagnostic Trouble Code (DTC) robustness improvements are included in this software
release. These improvements apply to the following DTC?s:
? P072F- Stuck in Gear 4
? P076F- Gear 7 shift incorrect ratio
? P0810- Clutch position control error
? P1CC9- Unable to engage gear
? P0734- Gear 4 shift incorrect ratio
? P061B- Internal control module torque calculation performance
NOTE: Diagnostic Trouble Code (DTC) robustness improvements were included in
TCM software p/n 682235$$AN or 682354$$AN ($$ are wild cards for any
number). Standard diagnostic trouble shooting procedures should be
followed for any vehicle equipped with TCM software p/n 682235$$AN or
682354$$AN exhibiting any of the previous codes.
Transmission shift improvements are included in this software release. These
improvements apply to the following:
? Garage shifts (Park to Reverse or Drive).
? Coastdown shift quality.
? Shift quality.
? Throttle response and performance feel.
? Management and prevention of busy shifting.
? Lift foot/change mind shift quality.
