20-NA-022

Service Bulletin
Bulletin No.:
20-NA-022
Date:
July, 2022
TECHNICAL
Subject:
Clunking Noise from Rear of Vehicle (Re-torque Leaf Spring Bolts)
Brand:
Model:
Chevrolet
GMC
Model Year:
VIN:
Engine:
Transmission:
2023
All
All
2023
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
Copyright 2022 General Motors LLC. All Rights Reserved.
Page 2
July, 2022
Bulletin No.: 20-NA-022
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.
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.
Parts Information
No parts are required for this repair.
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.
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.
Bulletin No.: 20-NA-022
July, 2022
Version
2
Modified
Released January 29, 2020
Revised February 11, 2021 – Added 2021 Model Year
Revised July 19, 2022 — Added the 2022 and 2023 Model Years.
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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