16-NA-003

Bulletin No.:
Service Bulletin
Date:
16-NA-003
February, 2024
TECHNICAL
Subject:
Chirp, Squeak Noise from Rear of Vehicle
Attention: This bulletin also applies to any of the models that may be Export vehicles.
Brand:
Cadillac
Chevrolet
Model:
ATS-V
Series
CTS-V
Series
Model Year:
VIN Breakpoint:
from
to
2016
2019
Camaro
2016
Corvette
2014
from
to
—
—
Engine:
Transmission:
All
All
2024
Additional Option (RPOs)
Chevrolet – Equipped with LT4 Engine, LGX Engine / NPP Exhaust, LT1 Engine / N10
Exhaust or LT1 Engine / NPP Exhaust
Cadillac – Equipped with LF4 or LT4 Engine
Condition
Some customers may comment on hearing a squeak or chirp noise coming from the rear
of the vehicle. The noise may be reported as being intermittent.
Cause
The noise may be caused by the opening/closing of the exhaust valves during normal
performance.
Correction
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
Note: There is a normal, audible noise associated with
the opening/closing of the exhaust valves. The squeak/
chirp noise noting the condition is an additional, more
shrill noise, and may be intermittent, influenced by
temperature and humidity.
Confirm that the front or rear/tail pipe valves are the
cause of the condition by activating the flow control
function of the exhaust system.
1. Raise and support the vehicle. Refer to Lifting and
Jacking the Vehicle in SI.
2. Use GDS to verify the exhaust flow control valves
open and close when commanding the Exhaust
Flow Control Valve On and Off with a scan tool.
3. For Camaro and Corvette models, the engine
sound management setting must be set to “Auto” to
enable the scan tool to operate the valves.
Copyright 2024 General Motors LLC. All Rights Reserved.
Note: The noise may only occur during valve opening
OR closing of a valve, not always both.
4. Command the flow control functioning numerous
times and listen for any squeak/chirp noise, over
and above the normal activation noise.
5. If the squeak/chirp noise is evident, continue
ahead to the lubrication Service Procedure below.
Page 2
February, 2024
Bulletin No.: 16-NA-003
Service Procedure
4340727
4340714
Important: Regardless the noisy valve location,
lubricate ALL exhaust valves on the system.
Generously lubricate the forward, and rear if equipped,
exhaust valves following the steps below:
1. Fully raise the vehicle.
3. Apply DRY SLIDE Multi-Purpose Dry Lubricant, P/
N 1052948 (in Canada, use 89021511), into the
valve by inserting the nozzle into the slot on the
valve. Liberally apply a generous amount of the
lubricant.
4340730
4340724
2. Position a drop cloth below the valve being
lubricated.
4. Move the drop cloth to and repeat application at
both, or all four valve locations, depending on the
exhaust system.
5. With all valves lubricated, command the flow
control functioning numerous times on all valves,
to work the lubricant into the valve.
6. During the flow control functioning, also verify the
squeak/chirp noise has been eliminated.
Bulletin No.: 16-NA-003
February, 2024
Page 3
Parts Information
Description
Part
Number
*LUBRICANT, DRI-SLIDE, 4
OZ AEROSOL VOC
COMPLIANT
LUBRICANT, DRI-SLIDE,
149 G (Canada)
01052948
P/N
89021511
(Canada)
Qty
1
*Export Regions must obtain this product locally or from any
source found available. There may be additional
manufacturers of such products/materials. General Motors
does not endorse, indicate any preference for, or assume
any responsibility for the products or material from this firm
or for any such items that may be available from other
sources.
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
4081088*
Description
Labor Time
Apply Lubricant to Exhaust
Valves
0.4 hr
*This is a unique Labor Operation for bulletin use only.
Version
6
Modified
Released on January 08, 2016
Revised January 22, 2016 – Added Corvette breakpoint, updated Additional Option
RPOS, updated step #2 and added step #3 to Correction.
Revised May 05, 2016 – Updated Additional Option RPOs.
Revised March 07, 2023 – Removed the Attention statement, updated Model Years,
removed Breakpoints, added Involved Region or Country section to table, removed
Export Regions, and Added Important statement under Correction.
Revised April 18, 2023 – Added an Attention statement and a statement in Parts
Information regarding Export vehicles.
Revised February 15, 2024 – Added up to the 2024 Model Year for Chevrolet Corvette
and Camaro and changed the warranty coverage statement.
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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