21-NA-122

Service Bulletin
Bulletin No.:
21-NA-122
Date:
April, 2023
TECHNICAL
Subject:
Vibration or Boom At 1300 RPM
This Bulletin replaces PIT5778. Please discard PIT5778.
Model Year:
Brand:
Model:
Chevrolet
Equinox
Holden
Equinox
2020
2020
GMC
Terrain
2020
2023
from
to
2020
2023
VIN:
from
to
Engine:
Transmission:
Involved Region or Country
North America, Middle East, Israel, Palestine, Argentina (Mercosur), Brazil (Mercosur),
Chile (West), Colombia (West), Ecuador (West), Peru (West), Uruguay (West), GM Korea
Company, Thailand (ASEAN), Australia/New Zealand, Egypt, Other Africa
Condition
A customer may come in with a complaint of excessive vibration in the steering wheel or
seat or floor at idle or at low to moderate speeds. .
– They may equate it to a vehicle speed, but it’s more likely in driving conditions of under
1300 RPM. Complaint can also be a very low frequency boom sound or a pressure in
their ears
Cause
This may be caused by a touch condition between the bottom surface of the radiator
upper bracket and the top of the radiator tank.
– There should be about 3 mm of free play in the vertical direction of the radiator upper
bracket to avoid bind-up and increased vibration or boom sound in the car. A badge or
credit card should be able to fit between the radiator upper mount and the radiator
tank, all the way to the locating pin.
Correction
Check whether upper brackets are rotated out of position. The anti-rotation tabs on the
brackets should be close to or touching the top of the tie-bar.
Verify if this is the cause of the sound or vibration, it can be verified in the stall by
evaluating vehicle idle noise/vibration and/or raising the engine RPM in Drive to 12001300 with foot on brake. While at this engine speed, have a helper remove the bolts on
the radiator upper brackets. The noise or vibration should improve or go away.
• If the noise or vibration is eliminated by loosening the bolts, replace both of the
radiator upper brackets. Refer to Radiator Upper Bracket Replacement in SI.
• If the noise or vibration is NOT eliminated by loosening the bolts, refer to SI.
Copyright 2023 General Motors LLC. All Rights Reserved.
Page 2
April, 2023
Bulletin No.: 21-NA-122
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.
Parts Information
Causal
Part
Description
Part
Number
Qty
X
BRACKET,RAD
UPR - LH
84981710
1
X
BRACKET,RAD
UPR - RH
84981711
1
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
Description
Labor Time
4030710
Radiator Upper Bracket
Replacement - Left Side
4030720
Radiator Upper Bracket
Replacement - Right Side
Use the
Published
Labor
Operations
Time
Version
3
Modified
Released July 12, 2021
Revised November 05, 2021 - Added 2022 to Model Year.
Revised March 30, 2023 - Added 2023 to 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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