NHTSA ID Number: 10250511
Manufacturer Communication Number: 24-NA-025
TSB/Document Date: 2024-02-23
Summary
This service bulletin provides repair information to correct a customer concern of Check Engine Light or Malfunction Indicator Lamp Illuminated with DTCs U0401 and/or U1611 Set.
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TSB/Document ID: 24-NA-025
Replacement Service Bulletin Number:
MFR Communication Date: 2024-02-07
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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Bulletin No.:
Service Bulletin
Date:
24-NA-025
February, 2024
TECHNICAL
Subject:
Check Engine Light or Malfunction Indicator Lamp Illuminated with DTCs U0401 and/or
U1611 Set
This Service Bulletin replaces PIC6534. Please discard PIC6534.
Brand:
Model:
Corvette
Model Year:
VIN:
from
to
from
to
2024
2024
—
—
Engine:
5.5L (LT6)
M1M
Involved Region or Country
North America, Europe, Middle East, Israel, Japan, Thailand, Australia/New Zealand
Condition
Some customers may comment on a Check Engine Light (CEL) or a Malfunction Indicator
Light (MIL) being displayed on the Instrument Panel Cluster (IPC) of the vehicle. No
driveability concerns will be found.
Service technicians may find U0401 set in the Transmission Control Module (TCM) and/
or U1611 set in the Body Control Module (BCM) on a Z06. One of these codes must be
set in the indicated modules and be the MIL request code for this bulletin to apply. These
DTCs are for a loss of communication with the Engine Control Module (ECM) on CAN
Bus 2.
Cause
The cause of the condition may be a software anomaly.
Correction
Reprogram the ECM.
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.
• 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.
Copyright 2024 General Motors LLC. All Rights Reserved.
•
•
•
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 12V 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.
Clear DTCs after programming is complete.
Clearing powertrain DTCs will set the Inspection/
Maintenance (I/M) system status indicators to NO.
Page 2
February, 2024
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.: 24-NA-025
Bulletin No.: 24-NA-025
February, 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
February, 2024
Bulletin No.: 24-NA-025
5644477
Important: Techline Connect screen 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. Record the WCC on the job card. No
further action is required. Refer to the Warranty
Information section of this bulletin.
1. Reprogram the Engine Control Module. Refer to
K20 Engine Control Module: Programming and
Setup in the Service Manual.
Bulletin No.: 24-NA-025
February, 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 the SPS Warranty Claim Code on the job
card for warranty transaction submission.
Page 6
February, 2024
Bulletin No.: 24-NA-025
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
2886048*
Reprogram ECM for Z06 Software Anomalies
0.3 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.: 24-NA-025
February, 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.
Version
2
Modified
Released January 31, 2024
Revised February 07, 2024 – Updated the Condition 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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