Bulletin No.:

Service Bulletin

Date:

22-NA-243
December, 2022

TECHNICAL
Subject:

Malfunction Indicator Lamp (MIL) Illuminated - DTC P2C7A Set

Brand:

Model:

Chevrolet

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

GMC

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

Model Year:
from

to

2022

2022

VIN:
from

Engine:

Transmission:

to

Involved Region or Country

North America

Condition

Some customers may comment that the MIL is illuminated.
Some technicians may find DTC P2C7A (NOx Catalyst Efficiency Below Threshold Bank
1 Catalyst 2) set in the Engine Control Module (ECM).

Cause

This condition may be caused by a software anomaly.

Correction

Check for an update to the ECM.
If one is available, perform the following:
• Update the ECM, refer to the Service Procedure.
• Perform the Nitrogen Oxide Sensor Reset NOx Sensor Reset in SI.
• Perform the Nitrogen Oxide Catalytic Converter Reductant Loading Reset NOx
Catalyst Reductant Loading Reset in SI.
If no updates are available, refer to SI.
Note: Refer to 22-NA-168 to aid in diagnosing.

Service Procedure
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.
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.

Copyright 2022 General Motors LLC. All Rights Reserved.

•

•

•

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.

Page 2
•

December, 2022

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-243

Bulletin No.: 22-NA-243

December, 2022

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

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December, 2022

Bulletin No.: 22-NA-243

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 ECM. Refer to K20 Engine Control
Module: Programming and Setup in SI.

Bulletin No.: 22-NA-243

December, 2022

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.

Parts Information

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.

Warranty Information

No parts are required for this repair.

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

2889088*

Engine Control Module Reprogramming with SPS, Nitrogen
Oxide Sensor Reset and Nitrogen Oxide Catalytic Converter
Reductant Loading Reset

0.5 hr

*This is a unique Labor Operation for Bulletin use only.
Important: **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 SPS2.

Page 6

December, 2022

Bulletin No.: 22-NA-243

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.
4. 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.
Version

1

Modified

Released December 05, 2022

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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