22-NA-150 Service Bulletin/Repair Instructions

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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