NHTSA ID Number: 10239086
Manufacturer Communication Number: 23-NA-018
TSB/Document Date: 2023-07-12
Summary
This bulletin provides a procedure to correct a customer concern that while driving at low speeds, the rear wheels lock up, causing vehicle to come to a stop as if the brakes were applied or the vehicle was shifted into park.
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TSB/Document ID: 23-NA-018
Replacement Service Bulletin Number:
MFR Communication Date: 2023-06-22
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
Service Bulletin
Bulletin No.:
23-NA-018
Date:
June, 2023
TECHNICAL
Subject:
Rear Wheels Lock Up While Driving At Low Speeds Feels Like The Brakes Applied Or
The Transmission Was Shifted To Park DTCs P2724 P2727 Or P2729 May Or May
Not Set
This Bulletin Replaces PIP5646D. Please Discard All Versions Of PIP5646.
Brand:
Model:
Silverado 1500
(New Model)
Sierra 1500
(New Model)
Involved Region or Country
Model Year:
from
to
2019
2020
VIN:
from
Engine:
to
MQE
North America
Some Customers may comment that while driving at low speeds, the rear wheels lock up
and cause the vehicle to come to a stop as if the brakes were applied or the vehicle was
shifted into park.
The customer may describe the condition occurred in the following situations:
First situation:
•
•
•
•
•
Condition
The vehicle was parked and allowed to hot soak.
The vehicle is restarted.
The transmission is shifted to drive.
The vehicle will drive forward for a short distance and the wheels lock up.
The transmission may stay in this condition for several key cycles and may be towed
in for service.
• The transmission may or may not have reverse.
Second situation:
•
•
•
•
The vehicle is driven and then idled in park from 30 minutes to 4 hours.
The transmission is shifted to drive.
The vehicle will dive forward for a short distance and the wheels lock up.
The transmission may stay in this condition for several key cycles and may be towed
in for service.
• The transmission may or may not have reverse.
Some technicians may find DTC’s P2727, P2729 or P2724 set in the Transmission
Control Module (TCM), but not in all situations.
– DTC’s may have not set when this condition occurred.
Cause
This condition may be caused by an internal TCM failure.
Correction
Do not clear any DTC’s from the TCM or perform a Service Fast Learn (SFL). Follow
published Service Information procedures for the replacement of the TCM.
Replace the TCM, with part number 24043411.
Copyright 2023 General Motors
LLC. All Rights Reserved.
Page 2
June, 2023
Bulletin No.: 23-NA-018
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
Service Procedure
Refer to Transmission Control Module Replacement
in SI.
Parts Information
Causal
Part
Description
Part
Number
Qty
X
Transmission
Control Module
24043411
1
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
8461430
Description
Labor Time
Transmission Control
Module Replacement
Use
Published
Labor Time
Version
1
Modified
Released June 22, 2023
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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