Service Bulletin

26-037

May 14, 2026

Version 2

Product Update: 2023–25 Accord TCU OTA Software Update for Data
Sharing
Supersedes Version 1 to revise the information at:
Under both REPAIR PROCEDURE and WARRANTY CLAIM INFORMATON sections, information was added.
APPLIES TO
Year

Model

Trim Level

VIN Range

2023–25

Accord

ALL

Check VIN status in iN for eligibility.

BACKGROUND
Due to a software programming issue of the Telematics Control Unit (TCU, also referred to as TSU), certain functions
may not operate as designed when accessed from the Screen Audio display. This condition results in an error
message displayed on the screen indicating "Setting Update Failure" when customers try to change certain settings.
CUSTOMER NOTIFICATION
Owners of affected vehicles will be sent a notification of this product update.
Do an iN VIN status inquiry to make sure the vehicle is shown as eligible. Some vehicles affected by this campaign
may be in your new or used vehicle inventory. Repair these vehicles before they are sold.
CORRECTIVE ACTION
Update the Telematics software.
WARRANTY CLAIM INFORMATION
Operation
Number

Description

Flat Rate
Time

0105C9

Update TSU software

0.3 hr

C

Do a battery cable
reset

0.2 hr

Defect
Code

Symptom
Code

6NL00

FNI00

Template
ID

Failed Part Number

A26037A
A26037B

8B100-30A-A74

PARTS INFORMATION
None.
TOOL INFORMATION
None.

CUSTOMER INFORMATION: The information in this bulletin is intended for use only by skilled technicians who have the proper tools,
equipment, and training to correctly and safely maintain your vehicle. These procedures should not be attempted by “do-it-yourselfers,” and
you should not assume this bulletin applies to your vehicle, or that your vehicle has the condition described. To determine whether this
information applies, contact an authorized Honda automobile dealer.

© 2026 American Honda Motor Co., Inc. – All Rights Reserved

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SOFTWARE INFORMATION
Before beginning the repair, make sure all diagnostic and reprogramming software are updated as listed.
i-HDS Software Version

1.013.003 or later

HDS Software Version

3.105.036 or later

Honda ECU Reprogramming

4.10.0.0 or later

Year/Model

Trim

Vehicle System

Program ID (or later)

2023-25 Accord

ALL

TCU

8B010-30A-A070

NOTE:
• Make sure the 12-volt battery is fully charged before starting an update.
• Use only approved VCI devices outlined in Service Bulletin 22-100 Updating Control Units/Modules with the ECU
Reprogramming Application.
• Warranty reimbursement for labor is not allowed for routine checking or installation of software updates.
• This update will not require entering a service bulletin number.
REPAIR PROCEDURE
The TCU cannot skip versions when updating. The TCU must be in version 8B010-30A-A060 to apply
version 8B010-30A-A070. All previous software versions for the TCU must be completed in order of
release and prior to updating to the current version.
1. Use Honda ECU Reprogramming to perform a software update on the TCU (also referred to as TSU).
NOTE:
• Depending on the vehicle’s current software level, additional ECU updates may be required that cannot
be de-selected when performing this TCU update. This can require multiple ignition cycles.
•

For more information about updating vehicle systems, refer to service bulletin 22-100, Updating Control
Units/Modules with the ECU Reprogramming Application.

•

If the update progress bar freezes for longer than 30 minutes, perform a battery cable reset. Then, turn
the ignition OFF then ON. Make sure the PC to VCI to vehicle connections are properly connected. Check
the network connection and try again from the beginning.

•

If an error occurs and/or the progress bar freezes for longer than 30 minutes, refer to the Error Code,
Cause and Recovery Action table below.
Error Code

Cause

Recovery Action
Perform a battery cable reset.

111222

An error was returned from the ECU to be updated.

0D1922

An error was returned from the ECU to be updated.

5B21U0

ON status of ignition could not be detected.

5012U0

Communication with the vehicle has been lost.

5055U0

Communication with the vehicle has been lost.

5019U0

Communication with the vehicle has been lost.

Turn the ignition OFF then
ON. Make sure the PC to VCI
to vehicle connections are
properly connected. Check
the Network connection and
try again from the beginning.
Turn the ignition OFF then
ON. Make sure the PC to VCI
to vehicle connections are
properly connected. Check
the Network connection and
try again from the beginning.
Perform a battery cable reset
if the error persists.

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