NHTSA ID Number: 11021755
Manufacturer Communication Number: A25-054
TSB/Document Date: 2025-08-08
Summary
Service Bulletin - Customers are experiencing issues with OnStar and HondaLink due to the software within the telematics control unit needing a software update.
Service Bulletin
July 30, 2025
25-054
Version 1
K73 Telematics Control Module Software Updates #1
APPLIES TO
Year
Model
Trim Level
VIN Range
2024
Prologue
ALL
ALL
SYMPTOMS
• Fixes issue where customers are not able to place an OnStar call.
• Customers are not able to send remote commands using the HondaLink application.
POSSIBLE CAUSE
The software within the telematics control unit may require an update.
CORRECTIVE ACTION
Check the software code and, if needed, perform a software update for:
Controller Code: K73
Controller Name: Telematics Control Module
WARRANTY CLAIM INFORMATION
Operation
Number
Description
Flat Rate
Time
0520A0
Inspect software - no update
0.20 hr
0525A5
K73 Telematics control module
reprogramming (includes inspection)
0.50 hr
Defect
Code
Symptom
Code
Template
ID
Failed Part
Number
A25054A
03265
03217
A25054B
85835908
TOOL INFORMATION
Tool Name
Part Number
Quantity
Multiple Diagnostic Interface 2 (MDI2)
07-EL-52100
1
Tech Line Connect (TLC) Software
Application Tool With Honda
Diagnostic Package
N/A
N/A
DCA-8000 Dynamic Diagnostic Charging System
MTRDCA8000PH
1
NOTE: Make sure the latest version of the Tech Line Connect (TLC) Software Application Tool with Diagnostic
Package is installed on your computer.
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.
© 2025 American Honda Motor Co., Inc. – All Rights Reserved
28872
Page 1 of 6
INSPECTION AND REPAIR PROCEDURE
Inspection Procedure
The following steps are for inspection of the K73 Telematic Control Module to determine if an update is required.
1. Connect the MDI 2 to both the PC and the vehicle, then launch the Honda TechLine Connect (TLC) application
from the desktop.
NOTE: Do not power on the vehicle at this time.
2. Use iN credentials to log in.
3. Select Launch TechLine Connect.
4. Select SPS2 from the side menu.
NOTE: SPS2 may automatically launch after selecting connect to vehicle.
5. Verify the VIN is displayed in the TLC drop down menu and matches the top center VIN window prior to using the
Service Programming System 2 (SPS2). If it does not match, type the VIN in the TLC window.
6. Type in Repair Order number under Job Card and select Next.
7. In SPS2 select Vehicle Software Status
NOTE: TLC will automatically compare the software installed on the vehicle against what is available on the
server.
Page 2 of 6
8. Check the vehicle software status. Locate Component Code K73 with the Controller (ECU) Name Telematic
Control Module.
•
•
If the Status column shows “Standalone Update Needed (SPS2)”, Click “Close” to exit the Vehicle Software
Status and proceed to Programming Procedure below.
If the Status column shows “Up-to-date”, an update is not needed. Submit warranty claim for inspection and
continue with normal troubleshooting.
PROGRAMMING PROCEDURE
The following steps are for vehicle preparation and programming the K73 Telematic Control Module.
NOTE: The programming procedure for K73 Telematic Control Module is different from other control modules.
1. Remove the negative terminal cover from the 12-volt battery.
2. Connect the DCA-8000 Dynamic Diagnostic Charging System, or current equivalent, to the 12-volt battery and set
to Reflash Mode.
3. Connect the MDI 2 to both the PC and the vehicle, then launch the Honda TechLine Connect (TLC) application
from the desktop.
NOTE: Do not power on the vehicle at this time.
4. Log in and launch TechLine Connect.
5. Select SPS2 from the side menu.
NOTE: SPS2 may automatically launch after selecting connect to vehicle.
6. Verify the VIN is displayed in the TLC drop down menu and matches the VIN in top center window prior to using
the Service Programming System 2 (SPS2). If it does not match, type the VIN in the TLC window
7. Type in Repair Order number under Job Card and select Next.
Page 3 of 6
8. Select Code K73 Telematic Control Module
9. Under Select Function Sequence ensure PREPARE FOR SOFTWARE UPDATE is selected and click next. This
will prepare the Telematic Control Module for the update process. This process can take approximately 2 minutes.
Page 4 of 6
10. Once PREPARE FOR SOFTWARE UPDATE is completed select SOFTWARE UPDATE and click NEXT to start
the reprogramming procedure.
11. Once the SOFTWARE UPDATE is completed select Programming & Service Activation and click Next. The
Programming & Service Activation should take less than 1 minute.
Page 5 of 6
12. Ensure the Serial Data Authentication Configuration displays Complete.
13. Verify the Control Module updated successfully completed with SUCCESS status and document the Warranty
Claim Code on repair order.
14. When the update is complete, select New in the lower right corner of the screen.
15. Use GDS2 to clear any DTCs that may have set.
NOTE: If a problem occurs while reprogramming, refer to job aid. Honda Updating Control Unit Modules with
TECHLINE CONNECT.
Page 6 of 6
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TSB/Document ID: A25-054
Replacement Service Bulletin Number:
MFR Communication Date: 2025-08-01
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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