File in Section:
Bulletin No.:

Service Bulletin

Date:

06 - Engine
14-06-04-003
February, 2014

INFORMATION
Subject:

Identifying Non-GM ECM Calibration Use and Power-Up Hardware Detection in
Duramax® Diesel Engines Using GDS 2

Models:

2014-2015 Chevrolet Express, Silverado
2014-2015 GMC Savana, Sierra
Equipped With Duramax® Turbocharged Diesel Engine 6.6L — RPO LGH or LML

Attention: In order to process an engine/transmission/drivetrain hard part Warranty Transaction,
the Service Personnel must retrieve and save the required GDS 2 screen shot
information as outlined below for the specific vehicle, before disassembly or removing
the engine/transmission/drivetrain components from the vehicle. Always refer to the
GM Service Policy and Procedures Manual for the latest GM Policy and Procedures
Information.

General Motors Position on Aftermarket
Power-Up Devices

GDS 2 Software Updates and Screen
Views

General Motors does not support or endorse the use of
devices or modifications that when installed, increase
the engine horsepower and torque.
This bulletin outlines the procedures to identify the
presence of non-GM (aftermarket) calibrations. GM
recommends performing this check whenever a hard
part failure is seen on internal engine, transmission,
transfer case or rear axle components, and before
disassembly, repair or replacement of an engine,
transmission, transfer case or rear axle assembly under
warranty. It is also recommended that the engine
calibration verification procedure be performed
whenever diagnostics indicate that an exhaust
aftertreatment system component replacement is
necessary.
Various Symptoms Caused by an Aftermarket
Power-Up Kit or Hardware
• Poor performance.
• Driveability concerns.
• Increased emissions.
• Knocking noise.
• Engine damage.
• Black smoke from the exhaust. This symptom may
not occur if the diesel particulate filter (DPF) is in
good working condition. The DPF will trap black
exhaust smoke unless it is cracked, melted or has
been removed from the exhaust system.

Copyright 2014 General Motors LLC. All Rights Reserved.

3713201

GDS 2 Software updates are available when released
and are indicated by the following prompt: Diagnostic
Package Updates Available. Whenever this prompt is
displayed, press the Update (1) button to download
the latest available software version.

Page 2

February, 2014

Bulletin No.: 14-06-04-003

Typical GDS 2 screen views may vary due to Model
Year, Model, Engine, Transmission and other
Equipment, and for example if the view was saved as a
“Report” or as a single screen shot .jpg, .jpeg or .png
file. It also depends on the GDS 2 software version
currently being used by the Service Technician.

GDS 2 Screen Shots Required by the
Calibration Group — 2014 Chevrolet
Silverado Typical View of Screen Shots
Generated as a Report
Notice: BEFORE authorizing any Duramax® diesel
engine or transmission replacement, the
Calibration Group will require depending on the
vehicle, copies of one or both of the following
GDS 2 screens in the .jpg, .jpeg or .png file format:
Engine Control Module — Calibration History,
Calibration Verification Number History and
Associated Parameters

3704095

Notice: This is a typical GDS 2 screen shot
generated as a “Report”, and taken from a Model
Year 2014 Silverado showing the: VIN, Calibration
History, Calibration Verification Number History and
other Associated Parameters

Bulletin No.: 14-06-04-003

February, 2014

Depending on the computer screen configuration
being used and the Number of Calibration History
Events Stored, you may need to take two screen
shots to retrieve, save and view all of the
information.
• Express, Silverado, Savana or Sierra: Retrieve
and save the GDS 2 screen information as
shown displaying the following:
• VIN
• Diagnostic Start Date
• Diagnostic End Date
• Calibration History

•

Page 3

Engine Control Module information showing the
following Parameters:
– Number of Calibration History Events Stored
– Calibration Part Number History
– Calibration Verification Number History
– Engine Calibration Part Number History

__________________________________________________________________
Transmission Control Module — Maximum
Calculated Engine Torque Parameter

3704228

Notice: This is a typical GDS 2 screen shot
generated as a “Report”, and taken from a Model
Year 2014 Silverado showing the: VIN and
Maximum Calculated Engine Torque Parameter
• Silverado or Sierra only: Retrieve and save the
GDS 2 screen information as shown displaying
the following:
– VIN
– Diagnostic Start Date
– Diagnostic End Date
– Maximum Calculated Engine Torque Parameter.

Page 4

February, 2014

Bulletin No.: 14-06-04-003

GDS 2 Screen Shots Required by the
Calibration Group — 2015 GMC Sierra
Typical View of Individual Screen Shots
Notice: BEFORE authorizing any Duramax® diesel
engine or transmission replacement, the
Calibration Group will require depending on the
vehicle, copies of one or both of the following
GDS 2 screens in the .jpg, .jpeg or .png file format:
Engine Control Module — Calibration History,
Calibration Verification Number History and
Associated Parameters

3713352

•
Notice: This is a typical GDS 2 “individual” screen
shot taken from a Model Year 2015 Sierra showing
the: VIN, Calibration History, Calibration Verification
Number History and other Associated Parameters.
Depending on the computer screen configuration
being used and the Number of Calibration History
Events Stored, you may need to take two screen
shots to retrieve, save and view all of the
information.
• Express, Silverado, Savana or Sierra: Retrieve
and save the GDS 2 screen information as
shown displaying the following:
• VIN (at bottom of screen - must be visible)

Engine Control Module information showing the
following Parameters:
– Number of Calibration History Events Stored
– Calibration Part Number History
– Calibration Verification Number History
– Engine Calibration Part Number History

Bulletin No.: 14-06-04-003

February, 2014

Page 5

Transmission Control Module — Maximum Calculated Engine Torque Parameter

3713426

Notice: This is a typical GDS 2 “individual” screen
shot taken from a Model Year 2015 Sierra showing
the: VIN and Maximum Calculated Engine Torque
Parameter
• Silverado or Sierra only: Retrieve and save the
GDS 2 screen information as shown displaying
the following:
– VIN (at bottom of screen - must be visible)
– Maximum Calculated Engine Torque Parameter.

Instructions for E-Mailing the Required
Information and .jpg, .jpeg or .png Files
to the Calibration Group
1. E-mail copies of the files to
[email protected]
Notice: Properly providing the requested
information in Step 2 and Step 3 is extremely
important.
2. In the Subject line of the E-mail include the phrase
”Duramax® diesel”, the complete VIN and Service
Agent BAC.
3. In the Body of the E-mail include the following:
3.1. Complete VIN
3.2. Mileage
3.3. Job Card Number (R.O. Number)

3.4. Service Agent BAC.
3.5. Service Personnel Name (Manager or
Technician)
3.6. A complete and comprehensive description of
the customer concern and cause of the
concern.
3.7. Include any additional information as to why
the Service Personnel believes that there
may be aftermarket calibrations or hardware
installed on the vehicle.
Notice: DO NOT cut and paste the GDS 2 screen
shots into the body of the e-mail. The .jpg, .jpeg or
.png files must be sent as e-mail ATTACHMENTS.
4. When sending the e-mail to the Calibration Group,
the .jpg, .jpeg or .png files must be “attached” to
the e-mail, in order to properly validate the
calibration.
5. E-mails that are sent without all of the above
information and attachments as outlined, may be
returned to the sender with a request for the
missing information.
6. Remember to review your e-mail replies for further
information from the Calibration Group.

Page 6

February, 2014

7. The Service Agent will receive an e-mail reply from
the Calibration Group after the calibrations have
been validated. The e-mail reply will advise the
Service Agent if the calibrations are OEM.
8. The Service Personnel may call the PQC after
receiving their e-mail notification from the
Calibration Group informing them that the
calibrations are OEM, if required to do so for
Warranty Requirements. Be prepared to provide all
of the usual documentation that is normally
required when requesting an assembly
authorization from the PQC.
⇒ If the Calibration Group determines that the
calibrations ARE aftermarket calibrations, DO
NOT contact GM Technical Assistance to
discuss warranty concerns on the aftermarket
calibrations. All questions and concerns about
warranty should be directed to the Service
Agent’s District Manager Aftersales (DMA) in
the United States and in Canada to the District
Manager - Customer Care and Service Process
(DM - CCSP).

Bulletin No.: 14-06-04-003

Warranty Information
•

The Service Management must be involved in any
situation that would justify the use of labor
operation 0600014.
• Notify the Service Agent’s District Manager
Aftersales (DMA) in the United States and in
Canada the District Manager - Customer Care and
Service Process (DM - CCSP).
• All claims will have to be routed to the Warranty
Support Center (WSC) for approval.
• Please refer to the latest version of Corporate
Bulletin Number 09-00-89-016, Labor
Operation 0600014 - Suspected Tampering or
Vehicle Modifications for important information.
For vehicles repaired under warranty, use:
Labor
Operation
0600014

Labor
Time

Description
Suspected Tampering or
Vehicle Modifications

0.2 hr

Duramax® is a Registered Trademark of General
Motors LLC (In the United States)
Duramax™ is a Trademark of General Motors LLC

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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