Bulletin No.: PIT5905
Published date: 04/6/2022

Preliminary Information
PIT5905 Front and Rear Drive unit Restriction
Models
Brand:

Model:

Model Years:

VIN:
from

to

Engine:

Transmissions:

BrightDrop

EV600

2022

All

All

All

All

GMC

HUMMER EV

2022

All

All

All

All

Involved Region or
Country

North America

Additional Options
(RPO)

S8L P79

Condition

This PI will explain the Front drive unit (S8L) and Rear Drive unit
(P79) restriction for the 2022 MY GMC HUMMER EV and
Brightdrop EV600. This program will start on April 1st, 2022 to
gather important feedback on this new Drive units. This bulletin will
be revised to announce the end of the restriction program at a later
date.

Cause

Product teams continually seek valuable information for engineering
improvements. To assist in this effort the restriction program will be
used for this product. It is imperative that freeze frame failure
records be captured along with DTC’s and not cleared.

Correction:
The HUMMER EV and EV600 Front drive unit (S8L) along with the HUMMER EV Rear Drive unit
(P79) restriction will be administered by the GM Technical Assistance Center (TAC). The
servicing technician must provide detailed customer comments, conditions, diagnostic
trouble codes (DTCs) and other useful information. To request restricted components,
dealerships are required to call Technical Assistance (TAC). Prior to calling TAC, please read
through this entire document. If diagnosis leads to replacement of one or more of the
restricted components listed below please have all SI document numbers used during
diagnosis available prior to contacting TAC.
TAC Telephone Number US 1-877-446-8227 (Action Center prompt or Hybrid prompt) Canada
1-800-263-7740 for English or 1-800-263-7960 for French
Danger: Always perform the High Voltage Disabling procedure prior to servicing any High
Voltage component or connection. Personal Protection Equipment (PPE) and proper
procedures must be followed.
The High Voltage Disabling procedure will perform the following tasks:
• Identify how to disable high voltage.
• Identify how to test for the presence of high voltage.

• Identify condition under which high voltage is always present and personal protection
equipment (PPE) and proper procedures must be followed.
Before working on any high voltage system, be sure to wear the following Personal
Protection Equipment:
• Safety glasses with appropriate side shields when within 50 feet of the vehicle, either
indoors or outdoors.
• Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather
protectors.
• Visually and functionally inspect the gloves before use.
• Wear the Insulation gloves at all times when working with the Drive Motor Battery
assembly, whether the system is energized or not. Failure to follow the procedures exactly
as written may result in serious injury or death.
1. Perform the high voltage disable procedure at the drive motor generator control module
assembly or cable connections. Refer to High Voltage Disabling in SI.
2. Perform the high voltage enable procedure when the front or rear drive unit
are installed and ready to be test driven.

Parts Information
Model

Description

Part Number

Quantity

HUMMER EV and EV600
HUMMER EV

Front drive unit (S8L)
Rear drive unit (P79)

24041528
24041532

1
1

Warranty Information
For vehicles repaired under the EV coverage, use the following labor operation.
Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for
coverage information.
Labor Operation
8620020
8620030

Description
Front Electric Drive Transmission Module
Replacement

Use Published Labor
Operation Time

Rear Electric Drive Transmission Module
Use Published Labor
Replacement
Operation Time
*This is a unique Labor Operation for Bulletin use only.

Version History
Version
Modi ed

Labor Time

1
04/06/2022 - Created on.

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