Bulletin No.:

Service Bulletin

Date:

22-NA-150
January, 2024

TECHNICAL
Subject:

Malfunction Indicator Lamp (MIL) Illuminated, Service Emission System and/or DEF
Level Low Message on Driver Information Center (DIC), DEF Level Sensor Reading
Incorrectly, DEF Level Sensor Being Erratic, DEF Level Sensor Stuck

Brand:

Model:

Cadillac

to

Escalade Models

2021

2024

Silverado 1500

2020

2021

2022

2022

Silverado 1500

2023

2024

Silverado 2500HD/
3500HD

2020

2024

Suburban

2021

Tahoe

2021

Sierra 1500

2020

2021

2022

2022

Sierra 1500

2023

2024

Sierra 2500HD/
3500HD

2020

2024

Yukon Models

2021

2024

Silverado 1500 LTD
(RPO J21, VIN Digit
5 = W/Y)

Chevrolet

Silverado 1500 New
(RPO J22, VIN Digit
5 = A/D)

Sierra 1500 Limited
(RPO J21, VIN Digit
5 = 8/9)
GMC

Model Year:
from

Sierra 1500 New
(RPO J22, VIN Digit
5 = H/U)

VIN:
from

to

2024

Engine:

Transmission:

LM2, L5P

Involved Region or Country

North America

Condition

Some customers may comment on one or more of the following conditions:
• MIL illuminated
• Service Emission System and/or DEF Level Low Message Displayed on the DIC
• DEF Level Sensor Reading Incorrectly
• DEF Level Sensor Being Erratic
• DEF Level Sensor Stuck

Cause

This condition may be caused by a software anomaly.

Copyright 2024 General Motors LLC. All Rights Reserved.

Page 2

Correction

January, 2024

Bulletin No.: 22-NA-150

Two variables are now available to view during Reductant Fluid Tank Level Reset
function on GDS2:
• Reductant Level = Learned and stored reductant level representing the percentage of
total tank volume.
• Reductant Level Sensor = Output from reductant level sensor representing a
percentage of reductant tank fluid height.
The Reductant Fluid Tank Level Reset function learns a new reductant level
Perform the following:
1. Update the K115 Reductant Control Module with the latest calibration.
2. Check Reductant Level is more than 35% using GDS2. If less than 35%, note value
in Repair Order Comments.
3. Check Reductant Level Sensor %. Note value in Repair Order Comments.
4. Add one gallon of Diesel Exhaust Fluid.
5. Check Reductant Level and Reductant Level Sensor % again. Note values in
Repair Order Comments.
6. Perform Reductant Fluid Tank Level Reset using GDS2.
7. Check Reductant Level and Reductant Level Sensor % one more time. Note values
in Repair Order Comments.
Note: After updating the reductant control module, the level percentage can be viewed
under ECM data.

•

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.

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.
• 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.
• 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.

Please verify that the radio time and date are set
correctly before inserting USB drive into vehicle
for programming, otherwise an error will result.
• Clear DTCs after programming is complete.
Clearing powertrain DTCs will set the Inspection/
Maintenance (I/M) system status indicators to NO.
Important: The service technician always needs to
verify that the VIN displayed in the TLC left side drop
down menu and the top center window match the VIN
plate of the vehicle to be programmed prior to using
Service Programming System 2 (SPS2) for
programming or reprogramming a module.
• For the TLC application, service technicians need
to always ensure that the power mode (ignition) is
“ON” before reading the VIN from the vehicle’s
VIN master module and that they do not select a
VIN that is already in the TLC application memory
from a previous vehicle.
• If the VIN that shows up in the TLC top center
window after correctly reading the VIN from the
vehicle does not match the VIN plate of the
vehicle, manually type in the VIN characters from
the vehicle VIN plate into the TLC top center
window and use these for programming or
reprogramming the subject module with the
correct vehicle VIN and software and/or
calibrations.
• The Engine Control Module (ECM) is the master
module (for VIP vehicles) that TLC reads to
determine the VIN of the vehicle. If the VIN read
from the vehicle by TLC does not match the VIN
plate of the vehicle, the ECM also needs to be
reprogrammed with the correct VIN, software and
calibrations that match the vehicle’s VIN plate.
• The Body Control Module (BCM) is the master
module (for GEM vehicles) that TLC reads to
determine the VIN of the vehicle. If the VIN read
from the vehicle by TLC does not match the VIN
plate of the vehicle, the BCM also needs to be
reprogrammed with the correct VIN, software and
calibrations that match the vehicle’s VIN plate.

Bulletin No.: 22-NA-150

January, 2024

Page 3

Caution: Be sure the VIN selected in the drop down
menu (1) is the same as the vehicle connected (2)
before beginning programming.

5743643

Important: If the vehicle VIN DOES NOT match, the
message below will be shown

5877000

Page 4

January, 2024

Bulletin No.: 22-NA-150

5644477

Important: Techline Connect screens shown above.
Important: If the same calibration/software warning is
noted on the TLC 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 K115 Reductant Control Module.
Refer to Reductant Control Module Programming
and Setup in SI.

Bulletin No.: 22-NA-150

January, 2024

Page 5

5644478

Note: The screenshot above is 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.

Parts Information
No parts are required for this repair.

Page 6

January, 2024

Bulletin No.: 22-NA-150

Warranty Information
For vehicles repaired under the Emission coverage,
use the following labor operation. Reference the
Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information.
Labor Operation

Description

Labor Time

2888888*

Reductant Control Module Programming and Setup and
Perform the Reductant Fluid Tank Level Reset

0.9 hr

*This is a unique Labor Operation for Bulletin use only.
Important: **To avoid warranty transaction rejections, carefully read and follow the instructions below:

6125814

•
•

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 SPS2.

Bulletin No.: 22-NA-150

January, 2024

Page 7

Warranty Claim Code Information Retrieval

6125774

If the Warranty Claim Code was not recorded on the
Job Card, the code can be retrieved in the SPS2
system as follows:
1. Open TLC on the computer used to program the
vehicle.
2. Select and start SPS2.
3. Select Settings (1).
4. Select the Warranty Claim Code tab (2).

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.

Page 8

January, 2024

Bulletin No.: 22-NA-150

Version

7

Modified

Released August 01, 2022
Revised February 22, 2023 - Added 2023 to Model Year.
Revised March 20, 2023 – Added 2024 Model Year HD Trucks
Revised May 17, 2023 – Changed “verbatim” to read “work order comments” under
Correction Section
Revised September 26, 2023 – Added the 2024 Model Year
Revised December 21, 2023 - Added bullet points and changed correction procedure in
Correction Section.
Revised January 04, 2024 – Added a note to the Correction Section.

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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