20-NA-227

Service Bulletin
Bulletin No.:
20-NA-227
Date:
May, 2022
TECHNICAL
Subject:
Wobble Vibration on Hard Acceleration
This bulletin replaces PIT5771B. Please discard all copies of PIT5771.
Brand:
Model:
Chevrolet
Equinox
GMC
Terrain
Model Year:
Build Date Breakpoint:
from
to
from
to
2020
2022
SOP
February
1, 2022
Engine:
Transmission:
1.5L Turbo
(RPO LYX)
—
Involved Region or Country
North America, Middle East, Israel, Palestine, Argentina, Brazil, Chile, Colombia,
Ecuador, Peru, Uruguay, GM Korea Company, Thailand, Egypt, Other Africa, Australia
and New Zealand.
Additional Options (RPO)
PLANT CODE-RAMOS ARIZPE, MEXICO (SAL) or PLANT CODE-SAN LUIS POTOSI,
MEXICO (SPM)
Condition
Some customers may comment that a Wobble/Vibration occurs on hard acceleration
(WOT) around 48 to 112 km/h (30 to 70 mph).
Cause
This condition may be caused by driveline vibration.
Correction
Important: This bulletin is to address the above scenario ONLY.
Refer to bulletin 21-NA-122 to confirm it is NOT a vibration induced by the upper radiator
mounts, prior to replacing axles.
If able to duplicate the concern, record the event using the Pico Scope with the CH51450-TA246 Triple Axis Sensor.
– If the Pico reading at the above mentioned speeds is T1 lateral above 40 mg or above
30 mg with 10 mg of T3 lateral, replace the front axles.
For this condition, replace BOTH the left and right front axles at the same time. If these
new, updated p/ns (as of November, 2021) have already been installed and the condition
is still present, refer to SI and/or contact TAC.
Copyright 2022 General Motors LLC. All Rights Reserved.
Page 2
May, 2022
Bulletin No.: 20-NA-227
Service Procedure
Warranty Information
Refer to Front Wheel Drive Half Shaft Replacement —
Left Side and Front Wheel Drive Half Shaft
Replacement — Right Side in SI.
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
Note: Only select the parts that coincide with the repair
performed. Replace the Front Drive Axles with the P/Ns
in this bulletin only, according to the vehicle
build RPOs.
Causal
Part
Description
Part
Number
Description
Labor Time
3087248*
Front Wheel Drive Halfshaft
Replacement - Both sides
(MNK/MNH - 6 speed FWD)
or (M3H/M3U & F48 9
speed AWD)
1.4 hr
3087258*
Front Wheel Drive Halfshaft
Replacement - Both sides
(MNK/MNH & F48 6
speed AWD)
1.3 hr
3087268*
Front Wheel Drive Halfshaft
Replacement - Both sides
(M3H/M3U - 9 speed FWD)
1.6 hr
Qty
X
SHAFT, FRT WHL
DRV HALF (Right
with M3U 9
spd &FWD)
X
SHAFT, FRT WHL
DRV HALF (Right
with MNK 6
spd &FWD)
85103939
X
SHAFT, FRT WHL
DRV HALF (Right
with 6 or 9 spd
MNK/MNH/M3U
&F48 AWD)
85103941
1
X
SHAFT, FRT WHL
DRV HALF (Left
with MNH/MNK
6 spd)
85103942
1
X
SHAFT, FRT WHL
DRV HALF (Left
with M3U 9 spd)
85103943
1
N/A
NUT, FRT WHL
DRV SHF
(One Time
Use Only)
N/A
RING-FRT WHL
DRV SHF RET
(AWD only)
N/A
SEAL,PWR
TRFER U HALF
SHF (ORING)(AWD only)
85103940
Labor
Operation
1
1
*This is a unique Labor Operation for Bulletin use only.
2
Refer
to EPC
1
1
Version
6
Modified
Released March 01, 2021
Revised July 21, 2021 - Added Transmission and Chassis Drive Line RPOs to Parts
Information section.
Revised February 10, 2022 — Revised Model Year, Parts Table, Correction, and
Warranty Information.
Revised March 04, 2022 — Revised Parts Table.
Revised March 10, 2022 — Added Breakpoint.
Revised May 25, 2022 — Edited the Labor Op Titles to help aid in proper selection.
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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