GM Bulletin No.: 14002
Date: January 2014

Service Bulletin

SERVICE UPDATE
SUBJECT:

Service Update for Inventory and Customer Vehicles
Underbody Appearance
Expires with Base Warranty

MODELS:

2014 Chevrolet Silverado 1500
2014 GMC Sierra 1500

This service update includes vehicles in dealer inventory and customer vehicles that return
to the dealership for any reason. This bulletin will expire at the end of the involved vehicle's
New Vehicle Limited Warranty period.
PURPOSE
This bulletin provides a service procedure to inspect and, if necessary, repair the appearance of
underbody components on certain 2014 model year Chevrolet Silverado 1500 and GMC Sierra
1500 vehicles that may not meet GM appearance requirements for new vehicles. These vehicles
may exhibit signs of premature surface degradation on certain underbody components.
This service procedure should be completed as soon as possible on involved vehicles
currently in dealer inventory and customer vehicles that return to the dealer for any type
of service during the New Vehicle Limited Warranty coverage period.
VEHICLES INVOLVED
All involved vehicles are identified by VIN in the Global Warranty Management System –
Investigate Vehicle History Application. Dealership technicians should always check this site to
confirm vehicle involvement prior to beginning any required inspections and/or repairs. It is
important to routinely use this tool to verify eligibility because not all similar vehicles may be
involved regardless of description or option content.
Additionally, a list of involved vehicles currently in dealer inventory is available on the “Service
Update Bulletin Information” link under the “Service” tab in GM GlobalConnect. Customer vehicles
that return for service, for any reason, and are still covered under the vehicle's base warranty
should also be checked for vehicle eligibility.

Copyright 2014 General Motors. All Rights Reserved.

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Bulletin No.: 14002

PART INFORMATION
Parts required to complete this service update are to be obtained as per the instructions provided
below. Do not order from General Motors Customer Care and Aftersales (GMCCA).
Part Number
X-121B
Obtain from Daubert
Chemical Company*
36502
Obtain from Lloyds
Laboratories**
*

Description

Quantity/Vehicle

Daubert Nox-Rust®
One Coat Rust Preventative Coating

8 Vehicles Per Can
(Submit in Net Item)

Lloyds Kryptonite Metal Treatment®
Life Long Rust Protection

8 Vehicles Per Can
(Submit in Net Item)

Contact Daubert Chemical Company at www.daubertchemical.com or 800-914-0034 (Inside
U.S.) or 708-496-7350 (Outside U.S.)

** Contact Lloyds Laboratories at www.lloydslaboratories.com or 1-800-361-6766 (North
America Only)
SERVICE PROCEDURE
Surface Degradation Inspection Procedure
With the vehicle on the ground, inspect the following components for signs of premature surface
degradation. Use the pictures below as guidelines to determine whether to repair or not to
repair. For components on the threshold of repair or not to repair, the default should be to
repair.


Front spring mounts (visible through wheelhouse)
No Repair Required

3686530

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Repair Required

3686529


Body mounts (visible underneath door(s))
No Repair Required

3686510

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Bulletin No.: 14002

Repair Required

3686508


Frame and flanges (visible through wheelhouse and underneath door(s))
No Repair Required

3687198

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Repair Required

3687196


Rear shock lower mounts
No Repair Required

3687935

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Repair Required

3686501


Rear axle assembly
No Repair Required

3686527

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3686524
Repair Required

3686525

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3686522
Surface Degradation Repair Procedure
1. Any loose rust or coating should be wire brushed off.
2. Using a rag and general purpose adhesive remover, wipe down the affected repair area.
3. For the front spring mounts, frame and body mounts, apply a coat of Daubert Nox-Rust®
P/N X-121B “One Coat Rust Preventative Coating” (aerosol), or equivalent.
4. For the rear axle assembly and rear shock mounts, apply a coat of Lloyds Kryptonite
Metal Treatment P/N 36502 Life Long Rust Protection (14 ounce aerosol), or equivalent.
WARRANTY TRANSACTION INFORMATION
Submit a transaction using the table below. All transactions should be submitted as a ZFAT
transaction type, unless noted otherwise.
Labor
Code
9100353
9100354
*

Description
Inspect Underbody Components
Repair Underbody Components (Includes Inspection)

Labor
Time
0.2
1.0

Net
Item
N/A
*

The amount identified in “Net Item” should represent the actual sum total of the cost for the
parts needed to perform the required repair. Daubert Nox-Rust® equals $1.87 per vehicle.
Lloyds Kryptonite Metal Treatment® equals $3.34 per vehicle. Total cost should not exceed
$5.21 per vehicle.

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Bulletin No.: 14002

DEALER PROGRAM RESPONSIBILITY
Whenever a vehicle subject to this service update enters your vehicle inventory, or is in your facility
for service in the future, and the vehicle is still covered under the New Vehicle Limited Warranty,
you must take the steps necessary to be sure the service update correction has been made before
selling or releasing the vehicle.

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 tools,
equipment, 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 dealer for information on whether your vehicle may benefit from the information.

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