Bulletin No.: 22-NA-150

Service Bulletin

Date: January, 2025

TECHNICAL
Subject:

Brand:

Cadillac

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
Model:

from

to

Escalade Models

2021

2025

Silverado 1500

2020

2021

2022

2022

Silverado 1500

2023

2025

Silverado 2500HD/
3500HD

2020

2025

Suburban

2021

Tahoe

2021

Sierra 1500

2020

2021

2022

2022

Sierra 1500

2023

2025

Sierra 2500HD/
3500HD

2020

2025

Yukon Models

2021

2025

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:

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

Involved Region or Country

VIN:
from

2025

Engine:
to

Transmission
:

LM2, L5P, LZ0

North America, Australia/New Zealand.
Some customers may comment on one or more of the following conditions:
• MIL illuminated

Condition

• 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 an anomaly, requiring a software update and reset
procedure.

Correction

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.

Copyright 2025 General Motors. All Rights Reserved.

Page 2

January, 2025

Bulletin No.: 22-NA-150

• 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. Check that the K115 Reductant Control Module with the latest calibration.
Important: All steps must be performed below.
. If yes, proceed with steps 2-7.
. If no, update the K115 Reductant Control Module to the latest calibration and proceed with steps 2-7.
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.

Bulletin No.: 22-NA-150

January, 2025

Page 3

• 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.
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

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January, 2025

Bulletin No.: 22-NA-150

5877000

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, 2025

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.

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:

Page 6

January, 2025

Labor Operation

Bulletin No.: 22-NA-150
Description

Labor Time

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.

Warranty Claim Code Information Retrieval

6125774

Bulletin No.: 22-NA-150

January, 2025

Page 7

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.
Version

10

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.
Revised February 05, 2024 - Added engine RPO to Model list.
Revised May 08, 2024 - Revised Cause and Correction Sections.
Revised January 15, 2025 - Added the 2025 Model Year.

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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