GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5404
URGENT - DISTRIBUTE IMMEDIATELY
Date:

May 21, 2020

Subject: N202300791 - Service Update
Diesel Exhaust Fluid System Inactive
Models: 2020 Chevrolet Silverado
2020 GMC Sierra
Equipped with Diesel Engines (RPO L5P or LM2)
To:

All General Motors Dealers

General Motors is releasing Service Update N202300791 today. The total
number of U.S. vehicles involved is approximately 108,497. Please see the
attached bulletin for details.
Global Warranty Management (GWM)
The Required Field Action section on the Investigate Vehicle History (IVH) screen will
be updated May 22, 2020 or sooner. A list of involved vehicles in dealer new inventory
is attached to this message. Please hold all warranty transactions until IVH has been
updated.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS

Service Update
N202300791 Diesel Exhaust Fluid System Inactive
Release Date:
Attention:

May 2020

Revision:

00

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.

Make
Chevrolet
GMC

Model
Silverado
Sierra

Model Year
From
To
2020

2020

RPO
L5P/LM2

Description
6.6L HD Diesel Engine/3.0L LD
Diesel Engine

Involved vehicles are marked “open” on the Investigate Vehicle History screen in GM Global Warranty Management
system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections
and/or repairs.
Condition

Correction

In some 2020 model year Chevrolet Silverado and GMC Sierra vehicles, equipped with diesel engines,
the Diesel Exhaust Fluid (DEF) system may not immediately reactivate, as it should, after the vehicle’s
control system finds that a DEF heater fault is no longer present. In these vehicles, after such a fault is
detected as absent, DEF system reactivation, including DEF injection, may not occur until the ignition
key is cycled.
Dealers are to reprogram the reductant control module.

Parts
No parts are required for this repair.
Warranty Information
Labor
Operation
9104860*
9104861*

Description
Verified Module Software or Calibration Level: Modules are both
Programmed with Same Level Software or Calibration
Reductant Control Module Reprogramming with SPS

Labor
Time
0.2

Trans.
Type
ZFAT

Net
Item
N/A

0.3

ZFAT

N/A

* Important: To avoid warranty transaction rejections, carefully read and follow the instructions below:
•

The SPS Warranty Claim Code must be accurately entered in the “SPS Warranty Claim Code” field of the
transaction.

•

When more than one Warranty Claim Code is generated for a programming event, it is required to document all
Warranty Claim Codes in the “Correction” field on the job card. Dealers must also enter one of the codes in the
“SPS Warranty Claim Code” field of the transaction, otherwise the transaction will reject. It is best practice to enter
the FINAL code provided by SPS.

Warranty Claim Code Information Retrieval
If the SPS Warranty Claim Code was not recorded on the Job Card, the code can be retrieved in the SPS system as
follows:
1.
2.
3.
4.

Open TIS on the computer used to program the vehicle.
Select and start SPS.
Select Settings.
Select the Warranty Claim Code tab.

The VIN, Warranty Claim Code and Date/Time will be listed on a roster of recent programming events. If the code is
retrievable, dealers should resubmit the transaction making sure to include the code in the SPS Warranty Claim Code
field.
Service Procedure
Caution: Before downloading the update files, be sure the computer is connected to the internet through a network cable
(hardwired). DO NOT DOWNLOAD or install the files wirelessly. If there is an interruption during programming,
programming failure or control module damage may occur.
Important: Carefully read and follow the instructions below.

•

Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector.
If there is an interruption during programming, programming failure or control module damage may occur.

Copyright 2020 General Motors. All Rights Reserved.

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Service Update
N202300791 Diesel Exhaust Fluid System Inactive
•

Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will
interrupt programming. Install a GM Authorized Programming Support Tool to maintain system voltage. Refer to
www.gmdesolutions.com for further information. If not available, connect a fully charged 12 V jumper or booster
pack disconnected from the AC voltage supply. DO NOT connect a battery charger.

•

Turn OFF or disable systems that may put a load on the vehicles battery such as; interior lights, exterior lights
(including daytime running lights), HVAC, etc.

•

Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M)
system status indicators to NO.

5431207

Important: TIS2WEB screen shown. Techline Connect screen is similar and will be included in the near future.
Important: If the Same Calibration/Software Warning is noted on the SPS screen, select OK and follow screen
instructions. After a successful programming event, the WCC is located in the Service Programming System dialogue
box of the SPS Summary screen. No further action is required. Refer to the Warranty section of the bulletin.
1.

Reprogram the Reductant Control Module. Refer to K115 Reductant Control Module: Programming and Setup in SI.

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Service Update
N202300791 Diesel Exhaust Fluid System Inactive

5431209

Important: TIS2WEB screen shown. Techline Connect screen is similar and will be included soon.
Important: To avoid warranty transaction rejections, you MUST record the warranty claim code provided on the SPS
Warranty Claim Code (WCC) screen on the job card. Refer to callout 1 above for the location of the WCC on the SPS
screen.
2.

Record SPS Warranty Claim Code on job card for warranty transaction submission.

Dealer 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.
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers' possession
and subject to this bulletin must be held and inspected/repaired per the service procedure of this bulletin before customers
take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealer-traded,
released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System
(CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting
an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified
for sale within the CPOIS system, or once again be used in the CTP program.

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.

We Support
Voluntary Technician
Certification
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