Bulletin No.: PIP5981G

Service Bulletin

Date: November, 2025

PRELIMINARY INFORMATION
Subject:
Brand:

EV Drive Unit/ internal components TAC Restriction
Model:

Model Year:
from

VIN:
to

from

Engine:

Transmission:

to

BrightDrop

ZEVO 400

2023-2024

All

All

All

All

BrightDrop

ZEVO 600

2023-2024

All

All

All

All

Chevrolet

BrightDrop
400

2025-2026

All

All

All

All

Chevrolet

BrightDrop
600

2025-2026

All

All

All

All

Cadillac

Escalade IQ

2025-2026

All

All

All

All

Cadillac

Escalade IQL 2026

All

All

All

All

Cadillac

VISTIQ

2026

All

All

All

All

Cadillac

OPTIQ

2025-2026

All

All

All

All

Cadillac

LYRIQ

2023-2026

All

All

All

All

Chevrolet

Blazer EV

2024-2026

All

All

All

All

Chevrolet

Equinox EV

2024-2026

All

All

All

All

Chevrolet

Silverado EV
WT

2024-2026

All

All

All

All

Chevrolet

Silverado EV
RST

2024-2026

All

All

All

All

GMC

HUMMER EV 2022-2026

All

All

All

All

GMC

HUMMER
SUV EV

2024-2026

All

All

All

All

GMC

Sierra Denali
EV

2024-2026

All

All

All

All

Involved Region or Country

North America

Condition

This PI will explain the front drive unit and (or) rear drive unit (s) and their components
are on restriction for above listed EV vehicles.
This program is to gather important feedback on these new drive units.
This document will be revised to remove vehicle model at time of restriction end for that
vehicle at a later dates.

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.

Note: S76, P76 and S77, P77 Complete drive unit are on restriction along with all internal components of all others
for listed vehicles at this time, reference EPC for most current part restriction status.

Copyright 2025 General Motors. All Rights Reserved.

Page 2

November, 2025

Bulletin No.: PIP5981G

Correction
The vehicles listed above with EV front and/or rear drive units and their components are subject to restriction, which
will be managed by the GM Technical Assistance Center (TAC).
To proceed, the servicing high-voltage-trained technician must provide detailed information, including customer
comments, vehicle conditions, diagnostic trouble codes (DTCs), and any other relevant details.
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, please have all SI document numbers used during diagnosis available prior to contacting TAC.
U.S. Dealers:
Please contact GM Technical assistance (TAC) by opening a case via Dealer Case Management (DCM) From the
DCM home page in Global Connect, click on “New TAC Case” found on the Technical Assistance tab.
Canadian Dealers:
Call 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.
With the High Voltage Disabling procedure you 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:
glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors.

Safety

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
replacement drive unit is installed and ready to be test driven.

Additional SI Keywords
PIT5905, PIT5905A, PIP5858, PIP5858A, PIP5858B, PIT6019, PIP5931,

Version

8

Modified

05/15/2024 - Created on.
08/20/2024 Updated models.
11/25/2024 Updated models.
12/16/2024 - Updated Models.
02/19/2025 - Updated to remove IPE/T18/K107 from the search field for BEV3
and remove complete drive units and modules from TAC restriction BET platforms.
03/25/2025 - Updated Models and correction.
05/27/2025 - Updated Model and years.
11/13/2025 - Updated Years and admin. Details.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job
properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.

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