Bulletin No.: PIP5621A
Published date: 11/22/2019

Preliminary Information
PIP5621A GM TAC Support On Vehicle Automatic Transmission
Concerns That Can Be Duplicated
Models
Brand:
All

Model:
All

Model Years:
2015 - 2020

VIN:
from
All

Engine:

to
All

All

Transmissions:
All

Involved Region or Country North America
Condition

Some customers may comment on the operation of the automatic transmission in
their vehicle or a vibration under various driving conditions.

Cause

GM has identi ed that multiple diagnostic repair attempts are being performed on
Customer vehicles that exhibit automatic transmission concerns without the proper
utilization of the GDS2 software to aid in identifying the cause of the automatic
transmission concern.

Correction:
In an attempt to better assist in diagnosing transmission concerns and x it right the rst time, we at GM TAC are
asking our dealers for your help, by providing a GDS2 session log prior to contacting TAC for assistance on
transmission concerns that have the ability to be duplicate.
• Dealers in the US, should attach the GDS2 session log (follow the latest version of PIP5632) to the TAC case
using the Dealer Case Management (DCM) System
• Dealers in the Canada, should email the GDS2 session log (follow the latest version of PIP4902) to
[email protected]
Dealers contacting TAC with Automatic Transmission concerns without providing a GDS2 session log, will be
provided with a TAC case number with recommendations to re- contact TAC using the following.
1: Check all modules for any DTCs.
2: Record all DTCs found.
3: Review the freeze frame data for any codes that have set.
4: Clear the codes.
5: Select the TCM under modules in GDS2 and then transmission data.
6: Drive the vehicle under the conditions described by the customer when the concern is present.
Note: If DTCs were found, refer to the freeze frame data to aid in determining how the vehicle should be driven to
aid in duplicating the DTCs or the customers concern.
Note: The customer may have to drive the vehicle to aid in duplicating the concern.
7: If the customer's concern is duplicated place a bookmark at the location(s) where the concern is present.
8: Back out of the software to the home screen and then select close the application.
9: Review the session log to aid in nding root cause of the customers concern.
10: Dealers contacting GM TAC for assistance should follow bulletin 08-00-89-014B prior to providing the GDS2
session log to TAC.

11: The preferred method of contacting TAC is using the Dealer Case Management (DCM) System with the session
log attached to the TAC case. TAC will review the GDS2 session log and reply back to the dealer using the DCM.
12: Dealers contacting Canada GM TAC for Automatic Transmission concerns by phone should follow the latest
version of PIP4902 and send the GDS2 session log to [email protected] prior to contacting Canada
GM TAC for assistance.

Additional SI Keywords
shake, shift, shifted, shifting, shudder,

Version History
Version

2

Modi ed

01/17/2019 - Created on
11/22/2019 - Added the 2020 model year.

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