17-NA-106

Bulletin No.:
Service Bulletin
Date:
17-NA-106
March, 2023
TECHNICAL
Subject:
Interior Cabin Boom, Vibration and/or Rumbling/Droning Noise Heard While Driving
Low Speeds in High Gear
Brand:
Model:
Chevrolet
Equinox
GMC
Terrain
Holden
Equinox
Model Year:
from
to
2018
2023
2018
2020
VIN:
from
Engine:
Transmission:
All
All
to
Involved Region or Country
North America, Middle East, Israel, Argentina, Brazil, Chile, Paraguay, Uruguay,
Columbia, Ecuador, South Korea, China, Thailand, Australia, New Zealand, Egypt and
Africa.
Condition
Some customers may comment on hearing a cabin boom, low frequency vibration and/or
a rumbling/droning noise when driving at low speeds with the transmission in high gear.
This condition is often more noticeable in lower temperatures.
Cause
When traveling between 1100 and 1300 RPM (low speed / high gear), the high powertrain
firing frequency may transfer energy to the body panels through the body structure.
The excited panels may radiate sound to the passenger compartment producing cabin
boom. This acoustic resonance may then be perceived as a low frequency rumbling/
droning noise that may cause some hearing discomfort.
Correction
Road test the vehicle to verify condition, then adjust the liftgate striker and adjustable
bumpers following the Service Procedure below.
Service Procedure
Important: Cabin boom will always be present,
however an improper setting of the liftgate striker and/
or adjustable bumpers may intensify the noise. The
procedure in this bulletin is intended to minimize the
effect the liftgate has on the noise being heard.
1. Verify the condition by road testing the vehicle:
1.1. Increase the vehicle speed above 38 mph (61
km/h), then allow the vehicle to shift into a
high gear to bring engine speed below
1500 rpm.
1.2. Slow the vehicle down to the minimum speed
that holds high gear (typically 35-36 mph
(56-57 km/h) for FWD, 32-33 mph (51-53 km/
h) for AWD, and evaluate boom noise during
steady speed driving.
1.3. Then lightly apply throttle to slowly accelerate
and evaluate boom noise under engine load.
2. Once the condition is verified, open the liftgate.
Copyright 2023 General Motors LLC. All Rights Reserved.
Page 2
March, 2023
Bulletin No.: 17-NA-106
4772397
3. Lay a scale/ruler (1) on top of the liftgate striker
and measure the striker position from the rear most
edge (2), to the trim panel (3).
4772399
4772398
• If the striker position measures different than 38
mm (1.50 in), as shown in the graphic example
above, continue to the striker adjustment in step
# 4.
• If the striker position measurement is 38 mm
(1.50 in), the positioning is correct. Jump ahead
to the liftgate bumper adjustment in step # 7.
4. Remove the striker trim cover (2) and loosen the
striker bolts (1).
5. Reposition the striker to the proper 38 mm (1.50 in)
distance and re-torque the bolts to 22 Y (16 lb ft).
6. Reinstall the trim cover.
Bulletin No.: 17-NA-106
March, 2023
Page 3
8. Adjust both upper liftgate bumpers to 3 mm (0.118
in) (1).
9. Verify cabin boom is minimized by repeating the
road test described in step # 1 above.
10. If the condition is not improved, open the liftgate
and adjust both bumper gaps smaller, by turning
the bumper inward by 1/2 turn.
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.
4756821
7. Locate the upper liftgate bumpers (1), one on
each side.
Labor
Operation
Description
Labor Time
2080808*
Road Test, Adjust Liftgate
Striker and Bumpers
0.6 hr
*This is a unique Labor Operation for Bulletin use only.
4756829
Version
4
Modified
Released April 10, 2017
Revised July 26, 2018 – Added Model Year 2019 and GMC Terrain Model Years 2018
and 2019.
Revised February 20, 2020 – Added Holden Model and 2020 Model Year.
Revised February 27, 2023 – Added 2021 – 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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