NHTSA ID Number: 11034444
Manufacturer Communication Number: SA-040-26
TSB/Document Date: 2026-07-03
Summary
This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-009/25 08/22/25 and 02/18/25 DESCRIPTION Some customers may experience a Connected Vehicle failure. The MyMazda App may display an Error Code. This document provides Error Code description and recovery information to assist with repairs. Index System Outline • MYMAZDA App Connected Vehicle (CV) Error Codes • Vehicle Confirmation Instructions • Troubleshooting Instructions • Resources
BULLETIN NOTES
This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red.
Previous SAs:
Date(s) Issued:
SA-009/25
08/22/25 and 02/18/25
SA-064/24
09/23/24
APPLICABLE MODEL(S)/VINS
2019-2026 Mazda3
2021-2023 CX-9
2024-2026 CX-90 (All)
2020-2026 CX-30
2022-2023 MX-30
2024-2026 MX-5
2021-2026 CX-5
2023-2026 CX-50 (All)
2025-2026 CX-70 (All)
DESCRIPTION
Some customers may experience a Connected Vehicle failure. The MyMazda App may display an Error Code. This
document provides Error Code description and recovery information to assist with repairs.
Index
•
•
•
•
•
System Outline
MYMAZDA App Connected Vehicle (CV) Error Codes
Vehicle Confirmation Instructions
Troubleshooting Instructions
Resources
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System Outline
System Structure Outline
A - MyMazda App
• User interface about operation / information
Main Function
(1) - Data
• Communication through customer network
B - System Center
• User / Contract information management system operation
C - Local Carrier
• Communication network provider
• Data, SMS and Voice
D - Vehicle
• System operation based on order by Telecommunication Module (TCU)
• TCU with SIM, works like smartphone
E - Service Provider (Canada)
• Additional service provider
Workflow Outline
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>Remote control function
(engine start, door lock, EV A/C,
location confirmation, ...)
A - MyMazda App
(1) - Request
(2) - Operation result
B - System Center
C - Local Carrier
D - Vehicle Operation
E - Service Provider (Canada)
>Notification function
(door unlock, EV charging status,
burglar-alarm, ...)
A - MyMazda App
(1) - Detected information
B - System Center
C - Local Carrier
D - Vehicle Detection
E - Service Provider (Canada)
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Private e-call
Canada only
>Connection to 3rd party service
(Private e-call, ...)
A - MyMazda App
(1) - Call
(2) - Response
B - System Center
C - Local Carrier
D - Vehicle Operation
E - Service Provider (Canada)
MYMAZDA App Connected Vehicle (CV) Error Codes
Index
Error Codes
200***
400S04
400S15
401C00
400C00
400S05
400S16
403C00
400C01
400S06
400S17
409C00
400C02
400S07
400S18
500C00
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400C03
400S08
400S19
500C01
400C04
400S09
400S20
500C02
400C05
400S10
400S21
500C03
400C06
400S11
400S22
500C06
400S00
400S12
400S23
500C07
400S01
400S13
400S24
E401005
400S03
400S14
400S25
E900500
Error Messages
Internal Usher SDK error
Multiple devices detected
Enrollment in Progress
Vehicle Confirmation Instructions
Troubleshooting Instructions
Error Code Troubleshooting
200***
Description
The request was completed successfully [200***]
Customer
No action needed
Dealer
No action needed
400C00
Description
This occurs when the customer's input information contains an invalid value or a required value does
not exist.
MyMazda App
Message
Please check the input and try again. [400C00]
Process Flow
Confirmation/
Recovery
Customer
Confirm input data (ex. input alphabet into the area which is
required number)
Check that there are no blanks in required input fields.
Dealer
If there are no abnormalities in the input values, there may be a
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problem with the system center -> Go to " Troubleshooting
Instructions".
400C01
Description
It occurs when customer's input contains invalid value or there is blank at required items.
Please check the input and try again. (400C01)
MyMazda App
Message
Process Flow
Confirmation/
Recovery
400C02
Description
MyMazda App
Message
Customer
Wait several minutes and try again.
Review the input data and try again.
Dealer
If the error continues to occur, there may be a problem with the system
center -> Go to " Troubleshooting Instructions".
It occurs when the request (date information) is incorrect.
Please check the date input and try again. [400C02]
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Process Flow
Confirmation/
Recovery
400C03
Description
MyMazda App
Message
Customer
Review the input data and try again.
Dealer
If the error continues to occur, there may be a problem with the system
center -> Go to " Troubleshooting Instructions".
This occurs when the customer's input information contains invalid values.
Please check the input and try again. [400C03]
Process Flow
Confirmation/
Recovery
Customer
Review the input data and try again.
Wait about 5 minutes and try the operation again.
Dealer
If the error continues to occur, there may be a problem with the system
center -> Go to " Troubleshooting Instructions".
400C04
This occurs when there is no data matching the conditions in the process of checking the vehicle
status using services such as Remote Control or Vehicle Status.
Main factors;
Description
MyMazda App
• When adding VIN or searching from MCVV, a VIN that was not registered at the center was
specified due to a VIN input error.
• Files are not uploaded from the onboard device (time lag in ofn files, etc.).
Please check the input and try again. [400C04]
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Message
Process Flow
Wait about 5 minutes and try the operation again.
Turn on IG-on, check the reception strength icon at the bottom
right of the center display.
Confirmation/
Recovery
Customer
If the reception is poor, the function cannot be executed.
Dealer
400C05
Description
MyMazda App
Message
Go to Vehicle Confirmation Instructions.
Occurs when there is no data matching the conditions during processing (ex. inbox update process)
Please check the input and try again. [400C05]
Process Flow
Confirmation/
Recovery
400C06
Description
Customer
Review the input data and try again.
Dealer
If there are no abnormalities in the input values, there may be a problem
with the system center -> Go to " Troubleshooting Instructions".
Occurs due to a processing error at the system center (call processing error).
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Please check the input and try again. (400C06)
MyMazda App
Message
Process Flow
Confirmation/
Recovery
Customer
Review the input data and try again.
Wait about 5 minutes and try the operation again.
Dealer
If there are no abnormalities in the input values, there may be a problem
with the system center -> Go to " Troubleshooting Instructions".
400S00
Description
This occurs because "Cancel" was selected in response to a push notification for an approval
request.
MyMazda App
Message
Please wait for a while and try again. If the error error continues, please contact the call center.
[400S00]
Process Flow
Confirmation/
Recovery
Customer
Retry the operation again.
Dealer
This is a system error and may or may not be resolved by repeated retries.
If the error continues to occur, there may be a problem with the system
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center -> Go to " Troubleshooting Instructions".
400S01
Description
Occurs when the next remote operation is performed before the previous remote operation request has
completed.
In addition, it occurs in the following cases;
All steps were not completed when replacing the TCU, and keys could not be exchanged.
Remote operation is in progress. Please wait for a while and try again. (400S01)
MyMazda App
Message
Only one remote request can be completed per 60-second period.
Cause
Multiple execution of remote control.
Process Flow
Confirmation/
Recovery
Customer
Wait for a response to the previous request, or wait 5 minutes and try
again.
Make sure that the vehicle keys are not left inside the vehicle. → If it
remains, it cannot be executed.
Check to see if any operations, such as opening a door, are being
performed between the time the operation is performed and the
response is received from the vehicle. → Cannot be executed if there
is an operation.
Turn on IG-on, check the reception strength icon at the bottom right of
the center display.
If the reception is poor, the function cannot be executed.
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Dealer
Follow the Vehicle Confirmation Instructions.
400S03
Description
This occurs when the data in question does not exist, has already been deleted, or the input data is
incorrect when deleting a user.
MyMazda App
Message
Target data is not available. This data has already been deleted or is incorrect. [400S03]
Cause
Because there are cases where conditions are not met, and where even if conditions are met, it may
be deleted depending on the timing of processing.
Process Flow
Confirmation/
Recovery
Customer
Review the input data and try again.
Dealer
If the error continues to occur, there may be a problem with the system
center -> Go to " Troubleshooting Instructions".
400S04
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TSB/Document ID: SA-040-26
Replacement Service Bulletin Number:
MFR Communication Date: 2026-06-16
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem: Connected Vehicle
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