Terrain FWD L4-2.4L (2010)
Control Module: Customer Interest
A/T Controls - Downshift Hesitation/Delayed Shifting
Bulletin No.: 09-07-30-016A
Date: November 25, 2009
Subject: Transmission Hesitation, Delayed Shifting, Shifting at Wrong Time (Reprogram TCM)
2010 Buick Enclave
2010 Chevrolet Equinox, Traverse
2010 GMC Acadia, Terrain
2010 Saturn OUTLOOK
Equipped with 6T40/45 (RPOs MH7, MHC) or 6T70/75 (RPOs MH2, MH4, MY9, MH6) Automatic Transmission
2010 Buick LaCrosse
Equipped with 3.0L (RPO LF1) Engine and 6T70 (RPOs MH2, MH4) Automatic Transmission
2010 Chevrolet Malibu
2010 Pontiac G6
2010 Saturn AURA
Equipped with 6T40 (RPO MH8) Automatic Transmission
All Vehicles Built Prior to the Following VIN Breakpoints:
This bulletin is being revised to add models. Please discard Corporate Bulletin Number 09-07-30-016 (07- Transmission/Transaxle).
Some customers may comment on transmission downshift hesitation, delayed shifting and shifting at the wrong time.
A revised transmission calibration has been developed to address these issues. Reprogram the transmission control module (TCM) with updated
calibration files using the TIS2WEB Service Programming System (SPS) application. Select SEQ Programming Sequence ECM/TCM from the
Supported Controllers screen. Refer to SI and Service Programming System (SPS) documentation for programming instructions, if required.
For vehicles repaired under warranty, use the table above.