21NA063

Service Bulletin
Bulletin No.:
21-NA-063
Date:
April, 2021
TECHNICAL
Subject:
Diagnostic Tip for Flutter and/or Buzz Type Noise Heard From the Rear of the Vehicle
This bulletin replaces PIP5694C. Please discard PIP5694C.
Model Year:
Brand:
Model:
Buick
Enclave
2018
XT5
2017
XT6
2020
Blazer
2019
Cadillac
Chevrolet
GMC
from
Traverse
2018
Acadia
2017
to
2021
Breakpoints:
from
Engine:
Transmission:
-
-
to
SOP to October 23, 2020
(Enclave/Traverse)
SOP to November 19, 2020
(Blazer)
SOP to November 24, 2020
(Acadia/XT5/XT6)
Involved Region or Country
United States, Canada
Additional Options (RPOs)
Equipped with CHASSIS DRIVE LINE-FRONT WHEEL DRIVE (RPO FWD)
Condition
Some customers may comment on a flutter and/or buzz type noise heard from the rear of
the vehicle.
Note: If the noise heard is not exactly as described, this bulletin DOES NOT apply and
normal diagnosis should be done.
Cause
This condition may be caused by noise that has been identified to be internal to the Fuel
Pump Module and occurs during purge with a ¾ tank full or more.
Correction
Verify that the vehicle exhibits the condition described following the procedure listed
below.
Service Procedure
1. Raise the vehicle in the air while the engine is
running. Refer to Lifting and Jacking the Vehicle
in SI.
2. Push up in the center of the fuel tank to hear if the
noise goes away.
If the noise goes away, replace the Fuel Tank Fuel
Pump Module Assembly. Refer to Fuel Tank Fuel
Pump Module Replacement in SI.
Copyright 2021 General Motors LLC. All Rights Reserved.
Parts Information
Causal
Part
X
Description
MODULE KIT - F/
TNK F/PMP (W/O
FUEL LEVEL
SENSOR)
Part
Number
Qty
84919662
1
Page 2
April, 2021
Bulletin No.: 21-NA-063
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.
Labor Operation
Description
Labor Time
4087898*
Fuel Tank Fuel Pump Module Replacement (FWD)
1.3 hrs.
*This is a unique Labor Operation for Bulletin use only.
Version
1
Modified
Released April 06, 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