File in Section:
Bulletin No.:

Service Bulletin

Date:

17-NA-394
February, 2018

TECHNICAL
Subject:

Squeak, Clunking Type Noise Heard From Rear of Vehicle

Brand:

Model:

Chevrolet

Colorado

GMC

Canyon

Model Year:

VIN:

from

to

2007

2012

2015

2017

2007

2012

2015

2017

from

to

Engine:

Transmission:

Involved Region or Country

North America and NA Export vehicles

Condition 1

Some customers may comment on a squeak type noise heard from the rear of the
vehicle.
Upon further investigation, the technician may diagnose the noise is coming from the rear
suspension leaf spring area.

Condition 2

Some customers may comment on a clunking type noise heard from the rear of the
vehicle.
Upon further investigation, the technician may diagnose the noise is coming from the rear
suspension leaf spring area.

Cause

These conditions may due to debris getting between the leaf springs.

Correction 1

Lubricate the leaf springs following the procedure below.

Correction 2

Re-torque the joints of the leaf spring assembly following the procedure below.

Service Procedure (Condition 1)
1. Raise the vehicle on a frame lift-type hoist.
2. Inspect the springs for damage. If none is found,
proceed to the next step.

3. Pressure wash the rear leaf springs to remove as
much dirt and grit as possible.
4. Dry the springs with compressed air.

1826776
Copyright 2018 General Motors LLC. All Rights Reserved.

Page 2

February, 2018

Bulletin No.: 17-NA-394

4842041

4842043

Important: Ensure any tool used to gently pry the tip
inserts or spring leaves is protected to prevent damage
to the spring leaves.
5. Apply a liberal amount of grease, P/N 19356408 (in
Canada, use P/N 19356409), both underneath and
on top of the front and rear tip inserts for the #2 and
#3 leaves, as indicated above. A screwdriver can
be used to gently pry up the leaf; however, a rag
around the screwdriver must be used to prevent
damage to the leaf. Use a flat-bladed tool, such as
a gasket scraper or a brush to properly distribute
the grease at least 6 inches from each end of
the leaf.
6. Lower the vehicle to the ground and test drive to
verify the repair.
Important: If the Service Procedure for Condition1
fixes the squeak, DO NOT proceed to Service
Procedure 2.

Service Procedure (Condition 2)
4842042

1. Support the vehicle at curb height when re-torquing
the leaf spring U-bolt nuts.
Note: DO NOT remove the fuel tank.

Bulletin No.: 17-NA-394

February, 2018

Page 3

4. Repeat steps 2 and 3 for the right side leaf spring.
5. Re-test the vehicle for the same clunking noise. If
the issue remains, follow the regular repair
procedure.

Parts Information
Causal
Part
N/A*

Description

Part
Number

LUBRICANT,
ACDELCO M-77
PASTE (2.0
OZ TUBE)

19356408
(In Canada,
use P/N
19356409)

Qty

2

*For warranty transactions, DO NOT mark this/these
parts as the Causal Part. Enter the word “Bulletin” in the
Causal Part Description free-flow text field.

Warranty Information
4966874

2. Loosen the left leaf spring anchor plate U-bolts (1).
3. Re-torque the anchor plate U-bolts (1). Refer to SI
for torque specifications.

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

8080008*

Lubricate Rear Leaf Springs-LD (Condition 1)

0.5 hr.

8080398*

Retorque Bolts / Road Test (Condition 2)

0.6 hr.

*This is a unique Labor Operation for Bulletin use only.

Version

3

Modified

Released December 08, 2017
February 09, 2018 – Updated steps for Service Procedure (Condition 2) and Warranty
Information (Condition 2).
February 13, 2018 – Updated the Warranty Information (Condition 2).

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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