NHTSA ID Number: 10253783
Manufacturer Communication Number: 20-NA-022
TSB/Document Date: 2024-05-01
Summary
This technical bulletin provides a procedure to re-torque the leaf spring u bolts to correct a condition of Clunking Noise from Rear of Vehicle (Re-torque Leaf Spring Bolts).
Service Bulletin
Bulletin No.:
20-NA-022
Date:
April, 2024
TECHNICAL
Subject:
Clunking Noise from Rear of Vehicle (Re-torque Leaf Spring Bolts)
Brand:
Model:
Model Year:
VIN:
Engine:
2024
All
All
2024
All
All
from
to
Silverado 2500HD/
3500HD
2020
Sierra 2500HD/
3500HD
2020
from
to
Involved Region or Country
North America, Middle East
Condition
Some customers may comment about a clunking noise coming from the rear of the
vehicle.
Upon further investigation, the technician may diagnose the noise coming from the rear
suspension leaf spring area.
Cause
This condition may be caused by movement between the anchor plate and axle
assembly.
Correction
The noise may be resolved by re-torqueing the joints of the leaf spring assembly.
Service Procedure
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.
1. Raise the vehicle to a level where the leaf spring
U-bolts are accessible.
Copyright 2024 General Motors LLC. All Rights Reserved.
Page 2
April, 2024
Bulletin No.: 20-NA-022
5295289
2. Loosen the leaf spring U-bolts (1).
3. Re-torque the leaf spring U-bolts (1). Refer to SI for
torque specifications.
4. Repeat steps 2 and 3 for the right side leaf spring.
5. Re-test the vehicle for the same clunking noise. If
the issue remains, continue diagnosis referring
to SI.
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.
Parts Information
No parts are required for this repair.
Labor Operation
Description
Labor Time
8080558*
Retorque Leaf Spring U-Bolts/Road Test
0.7
*This is a unique Labor Operation for Bulletin use only.
Version
4
Modified
Released January 29, 2020
Revised February 11, 2021 – Added 2021 Model Year
Revised July 19, 2022 — Added the 2022 and 2023 Model Years.
Revised April 16, 2024 – Added 2024 Model Year.
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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TSB/Document ID: 20-NA-022
Replacement Service Bulletin Number:
MFR Communication Date: 2024-04-16
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SUSPENSION
MFR Component System:
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