Flash: Transmission Shift And Drivability Enhancements This bulletin involves reprogramming the...

Bulletin number

21-010-16 REV. C

Component

Power train: automatic transmission: control module (TCM/PCM/tecm)

Summary

Flash: Transmission Shift And Drivability Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. Some customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, a technician may find one of the following Diagnostic Trouble Code (DTCs) stored in the TCM memory: P061B-00 - Internal Control Module Torque Calculation Performance. P072F-00 - Stuck In Gear 4.The following enhancements are included in the software update: Transmission shift quality enhancement in conjunction with Powertrain Control Module (PCM) reprogram. 7-8 gear increase shift at higher speed. 8-9 gear shift will happen on a downhill only. Coast down bump on 7-6, 6-5, 5-4, 5-3 downshift improvements. Cold 1-2, 2-3 upshift improvements. 1-2, 2-3 upshift flare control improvements. Power-on upshift improvements. Lift Foot Upshift 2-3, 4-5, 8-9 improvements. Improve transmission shift enhancements for sand and snow mode. Vehicle performance enhancements.

Owners of these vehicles have filed 74 complaints in the transmission category.