Bulletin No.: 24-NA-098

Service Bulletin

Date: March, 2025

INFORMATION
Subject:

Service Programming System (SPS) Errors (E4398, E4399, E4401, E4403,
M4404, M4413, M6954, M6955, E4414, E4423, E4491, E4492, or E6961)

This Service Bulletin replaces PI0592I. Please discard all versions of PI0592.
Brand:

Model:

Model Year:

GM Passenger Cars and Light Duty
Trucks

VIN:

from

to

from

to

2000

2025

—

—

Engine:

Transmission:

—

—

Involved Region or Country

North America, Australia/New Zealand

Condition

Some technicians may notice Service Programming System (SPS) Errors.

Correction

Reference the specific SPS programming error (E4398, E4399, E4401, E4403, M4404,
M4413, M6954, M6955, E4414, E4423, E4491, E4492, or E6961) and follow the
instructions, which will assist in understanding the cause and how to resolve the issue
without replacing the control module. Most errors can be resolved by following the basic
troubleshooting steps below.
Note: In order to contact Techline Customer Support (TCSC), a Dealer Case Management (DCM) case must be entered prior to calling TCSC.
If the programming error cannot be resolved using the following troubleshooting
instructions, and the CGM (Communication Gateway Module) has been updated to the
latest software where noted, do not replace the control module. Contact the Techline
Customer Support Center (TCSC) for assistance at:
TCSC: 1-800-828-6860 English or 1-800-503-3222 French, 8am-8pm (EST) Monday
through Saturday

Information required when calling:
• Dealer BAC
• Call back phone number (close proximity to the Techline PC and vehicle)
• VIN
• Description of service procedure being performed, (ex: bulletin, etc.)
• Error messages if any
Note: Using a Techline PC and programming device that meets the minimum specifications is essential to
successful programming and required for full support.

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.
Important: This technical service bulletin (TSB) can only be completed by certified repair facilities who have met all
specific training, tool and equipment requirements pertaining to the vehicle Brand and Model serviced. Repairs must
be performed by a technician who has successfully completed the required training.

Copyright 2025 General Motors. All Rights Reserved.

Page 2

March, 2025

Bulletin No.: 24-NA-098

E4398 – No Calibration Data
Cause:
This programming error is the result of a missing or incomplete data record. This error is not related to the module
being programmed or a vehicle issue.
Resolution:
Contact Techline Customer Support Center (TCSC) for programming instructions.
E4403 – Severe Error
Cause:
These general programming errors are typically the result of a loss of communication between the programming
device and module. The loss of communication can be caused by a drop in battery voltage, delay in communication
with the module or a vehicle issue such as interruption on the BUS (wiring, connector issue, aftermarket components, etc.).
Resolution:
Maintain a minimum of 12.5 volts during programming.
Attempt to re-establish communication with the module. This should first be done with GDS2 or Tech 2. If communication can be established, check the software level of the CGM and update if a newer version is available. Then,
reattempt programming the failed module using “Replace and Program ECU” as the programming method.
If communication cannot be re-established, deplete retained power by disconnecting the negative battery terminal for
a minimum of 5 minutes. Re-establish and maintain battery power, attempt to communicate with the control module
using MDI or Tech 2. Reattempt programming using “Replace and Program ECU.”
Some earlier model vehicles (pre-2007) may require the use of the Tech 2 and ‘Legacy Tech 2’ programming
option in SPS in order to utilize a slower programming communication speed.
M4413/E4414/M6954/M6955 – Calibrations marked with an (*)
Cause:
An ( * ) indicates that the SPS application is not recognizing the calibrations being read from the control module. This
can be caused by a non-GM calibration programmed into the control module or an incomplete SPS data record.
Resolution:
Contact TAC.
M4404 – No Communication with Diagnostic Tool
Cause:
This is a loss of communication between the programming device, (MDI or Tech 2), and Techline PC and not a
module or vehicle problem.
Resolution:
Confirm the connection from the PC. If the programming device is connected by USB, select a different USB port on
the Techline PC.
If using a wireless network for the MDI connection, confirm the wireless connection or switch to a USB connection (It
is important to disable the MDI wireless connection in the MDI wireless manager when using a USB connection).
If programming with a Tech 2, perform a Tech 2 self-test found in SPS under ‘Settings’, ‘Diagnostics’ then ‘Test
Connections.’ Try a known good Techline PC serial port connector and RS232 cable. A known good Tech 2 and
Candi module can be used.
Confirm and maintain proper battery voltage before attempting programming.

Bulletin No.: 24-NA-098

March, 2025

Page 3

E4423/E6961 – Programming Failed
Cause:
These errors can be the result of an incompatibility between the software/calibrations and the module, a result of a
condition that is not being met to allow a successful programming event (e.g., incorrect voltage and/or aftermarket
components), or a vehicle related issue (wiring, connector issue, aftermarket components, etc.).
Resolution:
This type of issue cannot typically be resolved without assistance from TCSC. Be sure to have the original and
service module part numbers and error detail when contacting TCSC.
This can be confirmed by attempting to program the original module. Typically, these errors cannot be resolved
without the assistance of TCSC. Do not replace the module. Contact TCSC and be sure to have the original module
part number and the service part number when calling.
E4401 – Severe Error: Writing data to device or controller failed
Cause:
These general programming errors are typically the result of a loss of communication between the programming
device and module. The loss of communication can be caused by a drop in battery voltage, delay in communication
with the module or a vehicle issue such as interruption on the BUS (wiring, connector issue, aftermarket components, etc.).
Resolution:
Typically, this issue can be resolved without the assistance of TCSC via the below workaround.
1. Shutdown TLC.
2. Rename SPS file in the C drive and save on the computer.
example: This PC > OSDisk (C:) > Users > (GM ID (six digits)) > sps
3. Relaunch TLC in admin mode.
E4491 – Reprogramming Error: Check all connections and reset Programming Interface
E4492 – Cyber Security Access Failure
E4399 – There was an error retrieving the controller data
Cause:
These errors can be the result of an incompatibility between the software/calibrations and the module, a result of a
condition that is not being met to allow a successful programming event (e.g., incorrect voltage and/or aftermarket
components), or a vehicle related issue (wiring, connector issue, aftermarket components, etc.).
Resolution:
Check the software level of the CGM and update if a newer version is available. Otherwise, this issue can be
resolved without the assistance of TCSC via the below workaround:
1. Clear cache.
2. Rename SPS folder in C drive and save on computer.
example: This PC > OSDisk (C:) > Users > (GM ID (six digits)) > sps
3. Relaunch TLC in admin mode.
4. Connect wired MDI.
Note: If steps 1 through 4 don’t work, try a different setup if available (computer/MDI/cable).

Page 4

March, 2025

Bulletin No.: 24-NA-098

Version

2

Modified

Released June 06, 2024 – PI0592I has now become Global Service Bulletin Number 24NA-098. This update adds the 2025 Model Year, Australia/New Zealand to Involved
Region or Country section, second Important statement, and additional SPS Error Codes
with Resolution.
Revised March 21, 2025- Revised to update the correction.

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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