H2 V8-6.2L (2008)
Control Module: Recalls
Campaign - Reprogram the TCM
# 08080: Service Update for Inventory Vehicles Only-Transmission Control Module Reprogram (Low Speed Engine Braking Sensation Upon Automatic
Downshift to First Gear) - Expires March 31, 2009 - (Mar 4, 2008)
Subject:
08080 -- Service Update for Inventory Vehicles Only - Transmission Control Module Reprogram (Low Speed Engine Braking Sensation Upon
Automatic Downshift to First Gear) -- Expires March 31, 2009
Models:
2008 HUMMER H2, H2 SUT
Equipped with 6 Speed Automatic Transmission (RPO MYC)
THIS SERVICE UPDATE INVOLVES VEHICLES IN DEALER INVENTORY ONLY AND WILL EXPIRE MARCH 31, 2009.
Purpose
This bulletin provides a service procedure to reprogram the transmission control module (TCM) on certain 2008 Hummer H2 and H2 SUT vehicles
equipped with a 6 Speed automatic transmission (RPO MYC). The new calibrations eliminate a low speed engine braking sensation upon automatic
downshift to first gear that may be unpleasant to some customers.
This service procedure should be completed on involved vehicles currently in dealership inventory as soon as possible, but no later than March 31, 2009,
at which time this bulletin will expire.
Vehicles Involved
A list of involved vehicles currently in dealer inventory is available on the "Service Update Bulletin Information" link under the "Service" tab in
DealerWorld (US), or attached to the Dealer Communication (Canada), used to release this bulletin.
Important:
Dealers are to confirm vehicle eligibility prior to beginning repairs by using the system(s) below. Not all vehicles within the above breakpoints may
be involved.
-- GM dealers should use GMVIS.
Calibration Information
Do not attempt to order the calibration number from GMSPO. The calibration numbers required for this service procedure are programmed into control
modules via a Techline Tech 2(R) scan tool and TIS 2 Web with the calibration update. Use TIS 2 Web version 3.0 for 2008 (available on 3/03/08); and
on TIS DVD version 3.0/2008 or later, which will be mailed to dealers beginning 3/12/08. If you cannot access the calibration, call the Techline
Customer Support Center.
Service Procedure
The "Required Field Actions" section of the GM Vehicle Inquiry System (GMVIS) must be checked to determine if a specific vehicle requires this
action. If GMVIS indicates that Service Update Bulletin 08080 remains 'open' and TCM reprogramming has not taken place, reprogram the TCM using a
Tech 2®(R) scan tool with the calibration update from Techline Information System (TIS).
Notice:
Before reprogramming, please check the battery condition to prevent a reprogramming error of any of the modules due to battery discharge. Battery
voltage must be between 12 and 16 volts during reprogramming. If the vehicle battery is not fully charged, use an additional jump battery if
necessary. Only use approved Midtronics charger or Jumper Packs, etc. to maintain proper battery voltage during reprogramming. Be sure to turn off
or disable any system that may put a load on the battery, such as automatic headlamps, daytime running lights, interior lights, heating, ventilation, and
air conditioning (HVAC) system, radio, engine cooling fan, etc. A programming failure3 or control module damage may occur if battery voltage
guidelines are not observed.
The ignition switch must be in the proper position. The Tech 2(R) prompts you to turn ON the ignition, with the engine OFF. DO NOT change the
position of the ignition switch during the programming procedure, unless instructed to do so.
Make certain all tool connections are secure, including the following components and circuits:
^
The RS-232 communication cable port
^
The connection at the data link connector (DLC)
