PIT5822

Service Bulletin Details

Public Details for: PIT5822

This preliminary information addresses a potential issue where the battery may become discharged if vehicle battery is disconnectedbefore the transmission module has gone to sleep.


- 2021 -

Models from 2021
2021 BUICK ENVISION 
Bulletin No.: PIT5822
Published date: 03/9/2021
Preliminary Information
PIT5822 Battery Discharged or Battery Draw / Discharge After
Battery Serviced
Models
Brand:
Buick
Model:
Envision
Involved Region or
Country:
Condition:
Cause:
Model Years:
2021
VIN:
from
SOP
Engine:
to
All
All
Transmissions:
All
North America, China
Discharged battery , battery discharged after vehicle service.
Possible TCM did not shut down properly.
If you have a vehicle in for service that requires disconnecting the battery and the battery is
disconnected before the vehicle has properly gone to sleep it is possible to put the TCM in a
state where it will not power mode correctly. The result of this is a 400 mA draw that is
constant. After service or if the vehicle has now returned with a discharged battery it will
necessary to verify using GDS that this condition is not present before releasing the vehicle
to the customer.
Correction:
Open GDS and select Module Diagnostics > K71 Transmission control Module > Data display
> Transmission Data . Scroll to the bottom of the list and view "Control Module Wake Up
Source". If the value for this parameter is "Battery Reconnect Detected" it will be necessary
to reset the K71 Transmission Control Module. If this parameter does not read "Battery
Reconnect Detected" proceed with regular battery drain diagnostics.
Back up in GDS to Module Diagnostics then select K71 Transmission Control Module >
Configuration And Reset Functions > Transmission Module Reset and follow the on screen
instructions.
Verify in the Data Display that the Control Module Wake Up Source no longer reads Battery
Reconnect Detected. It may be necessary to perform the reset procedure more than once for
the parameter to change.
Once verified the reset has occurred, perform an SPS reprogram of the K71 Transmission
Control Module.
Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty
coverage), use the following labor operation. Reference the Applicable Warranties section of
Investigate Vehicle History (IVH) for coverage information.
Labor Operation
Use Published Labor
Operation
Description
Labor Time
Reprogram TCM
Use Published Labor Time
Version History
Version
1
Modified
03/09/2021 - Created on.
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