Bulletin No.: 16-NA-274

Service Bulletin

Date: November, 2024

INFORMATION
Subject:

Low Cab Forward (LCF) Labor Operation Restrictions and Repair Restrictions
for US Medium Duty Dealers
US Medium Duty Dealers - Effective June 1, 2018, the Isuzu IQC process
will no longer be in effect. As of August 29, 2016, all of the repairs
listed in the Restricted Repairs section below require you to contact the
Fleet Action Center (FAC) prior to warranty repairs being performed.

Attention:

Brand:

Chevrolet

Model:

Low Cab Forward
Medium Duty 3500,
4500, 5500 and 6500

Involved Region or Country

Model Year:

VIN:

from

to

from

to

2016

2025

—

—

Engine:

Transmission:

All

All

United States

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.

Important Instructions Involving the Medium Duty Service Operations Manager (MDSOM):
On 2016 and newer Chevrolet 3500, 4500, 5500 and 6500 Low Cab Forward Medium Duty Trucks, if you are
working on any items listed in the Restricted Repairs section below, then you MUST contact your Medium Duty
Service Operations Manager (MDSOM)
• Patrick Skelley [email protected]
• John Kirtley [email protected]
• Jacob Matthews [email protected]
• Cory Hamilton [email protected]
• Chris Wade [email protected]
The MDSOM Office hours are Monday-Friday, 8 AM - 4:30 PM Eastern Standard time.

Restricted Repairs
Important: Failure to contact the Medium Duty Service Operations Manager (MDSOM) for repair authorization prior to replacement of any of these parts will result in non-payment of the warranty transaction.
The restricted repairs include:
• Engine Replacement
• Transmission Assembly Replacement
• Fuel Injectors

Copyright 2024 General Motors. All Rights Reserved.

Page 2

November, 2024

Bulletin No.: 16-NA-274

• Control Modules
• Turbocharger Assembly
• Catalytic Converter
• SCR (Selective Catalyst Reduction) Assembly
• SCR Catalyst
• DPF (Diesel Particulate Filter) Filter
• A/C Compressor
• Radio Replacement
• Paint Repairs
• Corrosion Repairs
• Fuel Tank
• Leaf Springs
• Diesel Automatic Transmission Oil Pan and/or Gasket
• Fuel Filters
• Belt Replacement
• Parking Brake Replacement
Please have the following information ready when calling the MDSOM for authorization. Depending on the
concern, MDSOM may require additional information.
1. The part number of the component that is currently in the vehicle.
2. The Vehicle Identification Number (VIN).
3. Diagnostic test results.
4. Related software/calibration numbers.

Labor Descriptions and Labor Codes
Labor
Descriptions

Labor Codes

Engine
Replacement

J1840, J1840T

Transmission
Replacement

K7000

Fuel Injectors

J59261 ~ 4

Control Modules

K6517, J6360, others TBD

Turbocharger
Assembly

J5860

Catalytic
Converter

L2300

SCR assembly

L3030

SCR Catalyst

L3050

DPF filter

L2295

A/C Compressor

D4440

Radio
Replacement

R0760

Paint Repairs

"A" codes

Corrosion
Repairs

"S" Codes

Fuel Tank

L1280

Leaf Springs

E3130, E3131, E3137

Bulletin No.: 16-NA-274

November, 2024

Diesel A/T Oil
Pan and/or
Gasket

K6500

Fuel Filters

J5420, L0730

Belt replacement

J0656, J0657

Shoe And/Or
Support Plate,
Propeller Shaft
Parking Brake
(Drum Type)
Internal Replace

H3000

Page 3

Important Note for Medium Duty Trucks Needing Engine and/or Transmission Repairs:
For those designated GM dealers who are REQUIRED to contact the Product Quality Center (PQC) prior to
replacing an assembly, you MUST follow the PQC Assembly Replacement Process outlined in Bulletin 16-NA-338
when repairing a Medium Duty truck built with a 6.0L GM gasoline engine and 6L90 transmission. Call the PQC at
1-866-654-7654 prior to replacing an assembly. Engine replacement will also require pre-approval from your Service
Operations Manager at FAC.
If you have any questions, please contact GM Medium Duty Service Operations Manager (MDSOM):
• Patrick Skelley [email protected]
• John Kirtley [email protected]
• Jacob Matthews [email protected]
• Chris Wade [email protected]
The MDSOM office hours are Monday-Friday, 8 AM - 4:30 PM Eastern Standard time.

Important Note for 6500 and 7500 series Medium Duty Trucks with Diesel Engine and Allison
Transmission:
Any needed repairs to the Allison transmission and TCM 5500, 6500 and 7500 must be performed by an authorized
Allison transmission dealer. GM will not process any Allison transmission repairs via Global Warranty.
For the Cummins engine most, repairs will be made by Cummins authorized repair center follow the direction as
called out in service information.

Radios Needing Repairs
Specific procedures apply to radio repairs – refer to Radio bulletin #16-NA-368.

Referral to TAC
After consulting with your MDSOM, you may need to contact TAC for further diagnosis or assistance, and to allow
TAC to create a TAC case.

Global Warranty Transaction Submission
1. For calls to the MDSOM for the listed parts that result in a referral to TAC, you must have a TAC case number
before you can submit the claim to Global Warranty.
2. The dealer must enter the TAC case number in the “correction” comments section of the claim.
3. Other questions regarding the submission of these claims can be answered by your MDSOM.

Page 4

November, 2024

Bulletin No.: 16-NA-274

Version

8

Modified

Revised September 29, 2017 – Added the 2018 Model Year and Labor Code H3000.
Revised May 03, 2018 – Added Model 6500, the 2019 Model Year and Updated Various
Document Content.
Revised June 22, 2018 – Noted Elimination of Isuzu IQC Process and Updated FAC
Contact Information.
Revised February 27, 2019 — Added the 2020 Model Year and Updated FAC Service
prompt from #4 to #5.
Revised October 22, 2019 – Updated the Bulletin # under Important Note for Medium
Duty Trucks Needing Engine and/or Transmission Repairs.
Revised May 17, 2022 – Added 2021-2023 Model Years.
Revised November 08, 2024 - Added 2024-2025 Model Years and updated applicable
information through-out the Bulletin.

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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