Vibration or Boom At 1300 RPM – 2020-2022 Chevrolet Holden GMC

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Service Bulletin Bulletin No.: 21-NA-122
Date: November, 2021
TECHNICAL
Subject: Vibration or Boom At 1300 RPM
This Bulletin replaces PIT5778. Please discard PIT5778.
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Chevrolet Equinox 2020 2022
Holden Equinox 2020 2020
GMC Terrain 2020 2022
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
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 1200-
1300 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 NOTeliminated by loosening the bolts, refer to SI.
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
Use the
Published
Labor
Operations
Time
4030720 Radiator Upper Bracket
Replacement – Right Side
Page 2 November, 2021 Bulletin No.: 21-NA-122
Version 2
Modified Released July 12, 2021
Revised November 05, 2021 – Added 2022 to Model Year.

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