21NA250

Bulletin No.:
Service Bulletin
Date:
21-NA-250
November, 2021
TECHNICAL
Subject:
Pop Noise From Front of Vehicle
Brand:
Model:
Buick
Envision
Model Year:
Vehicle Build Date:
from
to
from
to
2021
2021
SORP
January
01, 2021
Engine:
Transmission:
Involved Region or Country
North America
Condition
Some customers may comment on a pop noise heard from the front of vehicle when
shifting from Park to Drive and/or Park to Reverse.
– The noise can also occur at low speed parking lot maneuvers (i.e. Accelerator pedal tip
in, tip out, and braking).
Cause
This condition may be caused by the right side engine mount or left side transmission
mount failure.
Correction
Diagnose bad mount with chassis ears and replace failed mount.
Service Procedure
Refer to Engine Mount Replacement or Transmission
Mount Replacement in SI.
Parts Information
Use the VIN and refer to the GM Electronic Parts
Catalog (EPC) to determine the proper part to order.
Causal
Part
Description
Part
Number
Qty
X
MOUNT, ENG
84356441
1
84356442
1
X
MOUNT, TRANS
84356461
1
84356456
1
N/A
BOLT, ENG MT
11589275
2
N/A
BOLT, ENG
MT BRKT
11547744
3
N/A
BOLT, TRANS
MT BRKT
11610907
4
Copyright 2021 General Motors LLC. All Rights Reserved.
Page 2
November, 2021
Bulletin No.: 21-NA-250
Labor Operation
Description
Labor Time
4067090
Engine Mount Replacement
8464270
Transmission Mount Replacement
Use the Published Labor
Operations Time
Warranty Information
Important: Only select the labor operation that
coincides with the repair performed.
For vehicles repaired under warranty, use:
Version
1
Modified
Released November 10, 2021
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.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION