File in Section:
Bulletin No.:

Service Bulletin

Date:

16-NA-003
February, 2016

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:

Model:

Model Year:
from

VIN:
to

from

to
December
15, 2015

Chevrolet

Camaro

2016

2016

Start of 2016
Production

Chevrolet

Corvette

2014

2016

Start of 2014
Production

November
16, 2015

Cadillac

ATS - V
Series

2016

2016

Start of 2016
Production

December
3, 2015

Cadillac

CTS - V
Series

2016

2016

Start of 2016
Production

December
2, 2015

Engine:

Transmission:

All

All

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 values during normal
performance.

Additional Option RPOs

Chevrolet – Equipped with LGX Engine / NPP Exhaust, LT1 Engine / N10 or NPP
Exhaust, or LT4 Exhaust
Cadillac – Equipped with LF4 or LT4 Engine

Correction

Service Procedure

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.
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.
Copyright 2016 General Motors LLC. All Rights Reserved.

4340714

Important: Regardless the noisy valve location,
lubricate ALL exhaust valves on the system.

Page 2

February, 2016

Bulletin No.: 16-NA-003

Generously lubricate the forward, and rear if equipped,
exhaust valves following the steps below:
1. Fully raise the vehicle.

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.

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

Warranty Information
For vehicles repaired under warranty, use:

4340727

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.

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

2

Modified

January 22, 2016 — Added Corvette breakpoint, updated Additional Option RPOs,
updated step #2 and added step #3 to Correction.

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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