N212336570

GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5809
URGENT - DISTRIBUTE IMMEDIATELY
Date:
June 1, 2021
Subject: N212336570 - Service Update
Vehicle May Falsely Set Fuel Injector Diagnostic Trouble Codes
P026C and/or P20EE (Unsold Only)
Models: 2021 Chevrolet Silverado HD
2021 GMC Sierra HD
Equipped with Duramax 6.6L Turbo-Diesel (RPO L5P)
To:
All General Motors Dealers
General Motors is releasing Service Update N212336570 today. The total
number of U.S. vehicles involved is approximately 9,885. 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 June 2, 2021 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
N212336570 Vehicle May Falsely Set Fuel Injector Diagnostic
Trouble Codes P026C and/or P20EE (Unsold Only)
Release Date:
Attention:
May 2021
Revision:
00
This service update involves vehicles in dealer inventory only and will expire May 31, 2022.
Make
Chevrolet
GMC
Model
Silverado HD
Sierra HD
Model Year
From
To
RPO
Description
2021
L5P
Duramax 6.6L Turbo-Diesel
2021
This service update should be performed on vehicles in dealer inventory only. 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
Certain 2021 model year Chevrolet Silverado HD and GMC Sierra HD trucks may falsely set fuel injector
diagnostic trouble codes P026C and/or P20EE.
Dealers will reprogram the engine control module (ECM).
Parts
No parts are required for this repair.
Warranty Information
Labor
Operation
9105680
9105681
Important:
Description
Verified Module Software or Calibration Level: Module Is
Programmed with Same Level Software or Calibration
Engine Control Module Reprogramming with SPS
Labor
Time
0.2
Trans.
Type
Net
Item
ZFAT
N/A
0.3
* To avoid warranty transaction rejections, carefully read and follow the instructions below:
•
The Warranty Claim Code must be accurately entered in the “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
“Warranty Claim Code field of the transaction, otherwise the transaction will reject. It is best practice to enter
the FINAL code provided by SPS/SPS2.
Warranty Claim Code Information Retrieval
If the 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/TLC on the computer used to program the vehicle.
Select and start SPS/SPS2.
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.
Note: 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.
•
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.
Copyright 2021 General Motors. All Rights Reserved.
Page 1 of 5
Service Update
N212336570 Vehicle May Falsely Set Fuel Injector Diagnostic
Trouble Codes P026C and/or P20EE (Unsold Only)
•
Follow the on-screen prompts regarding ignition power mode, but ensure that anything that drains excessive power
(exterior lights, HVAC blower motor, etc) is off.
•
Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M)
system status indicators to NO.
Caution: Be sure the VIN selected in the drop down menu (1) is the same as the vehicle connected (2) before
beginning programming.
5743643
5644477
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Service Update
N212336570 Vehicle May Falsely Set Fuel Injector Diagnostic
Trouble Codes P026C and/or P20EE (Unsold Only)
5431207
Important: Techline Connect and TIS2WEB screens shown above.
Important: If the same calibration/software warning is noted on the TLC or SPS Summary 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 Engine Control Module. Refer to K20 Engine Control Module: Programming and Setup in SI.
•
Crank Angle Sensor Learn portion of the setup can be skipped, since the ECM is only being
reprogrammed, not replaced.
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Service Update
N212336570 Vehicle May Falsely Set Fuel Injector Diagnostic
Trouble Codes P026C and/or P20EE (Unsold Only)
5644478
5431209
Note: The screenshots above are an example of module programming and may not be indicative of the specific
module that is being programmed. Module selection and VIN information have been blacked out.
Important: To avoid warranty transaction rejections, you MUST record the warranty claim code provided on the
Warranty Claim Code (WCC) screen shown above on the job card. Refer to callout 1 above for the location of the
WCC on the screen.
2.
Record SPS Warranty Claim Code on job card for warranty transaction submission.
Dealer Responsibility
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Service Update
N212336570 Vehicle May Falsely Set Fuel Injector Diagnostic
Trouble Codes P026C and/or P20EE (Unsold Only)
Dealers must take the steps necessary to ensure that the service update correction has been made to all involved vehicles
in dealer inventory before selling or dealer-trading the vehicle, but no later than May 31, 2022.
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.
Dealer Reports
The Inventory tab of the Open Vehicle Report will contain Service Update Bulletin VINs that apply to this field action.
This information is intended to assist dealers with the PROMPT COMPLETION of these vehicles. The Customer InService tab will not contain Service Update Bulletin VIN data because the intent of a Service Update Bulletin is to not
inconvenience a customer with a special trip for service. Service Update Bulletins are to be completed when the
customer is in for a regularly scheduled visit.
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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