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
Dealer
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
center -> Go to " Troubleshooting Instructions".
E401005
Description
Due to the app’s specifications, if there is a 2+ hour difference or lag with the actual/correct time, an
error could occur.
Please check the time / time zone settings. (E401005)
MyMazda App
Message
Customer
Customer to check and verify their Date & Time settings on their phone
(note: most phones will have
the correct time automated based on their time zone).
iPhone Example
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E900500
Description
In case KINTARO cannot get a response from a system outside KINTARO.
KINTARO is working well, and the network fault may be fixed after some minutes
MyMazda App Message
It is taking longer than normal to respond. Please try again later. [E900500]
Error Messages
Internal User SDK error
Customer inadvertently texted “Stop” to 1-949 518-0058
(Twilio SMS)
Description
MyMazda App - Internal Usher SDK error.
MyMazda App Message
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1. Text “Start” to 1-949 518-0058 (Twilio SMS)
2. Retry to create a MyMazda account.
Note: USA and Canada only
Customer
Multiple devices detected
Usually occurs if the same login credentials were used on different devices.
Description
Example, iPhone and Android.
Notification Center
Multiple devices detected
Our records indicate that your MyMazda account is being accessed across multiple devices.
MyMazda App Message
Customer
No action needed
Enrollment in Progress
Description
Enrollment in Progress
Another Connected Services enrollment request is currently in process already. Please try
again later.
MyMazda App
Message
Dealer
CV cancelation has failed. Update TCU to the latest software.
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Vehicle Confirmation Instructions
Step![]()
Inspection Items
1
2
Is the concern related to a remote
control function?
Yes
proceed to step2
No
proceed to step3
proceed to the next step![]()
No
Check the remote![]()
operation condition again
and confirm if it works
properly (example: key
left in vehicle during
remote
start function).
Yes
proceed to the next step![]()
No
Select Enable and retry.
Using M-MDS, are there any DTC's stored?
DTC INSPECTION
Yes
Go to normal MGSS
DTC troubleshooting
No
proceed to the next step![]()
Is the TCU and CMU at the latest software version?
Yes
proceed to the next step![]()
No
Update software to the
latest version, then
recheck concern.
Check whether the vehicle requirements for remote
operation are met (
example: key left in vehicle during remote
start function).
Does the customer's smartphone MyMazda App have a failure message
at the time of occurrence?
3
5
Action
Yes
Check MAZDA
CONNECT settings.
Confirm Connected Services in System Settings is Enabled.
4
Result
• CMU Software Update
• TCU Software Update
Good
Reception
proceed to the next step![]()
Does the CV reception strength icon show good or weak reception?
6
Does the CV reception strength icon show no contract?
Weak
Reception Move vehicle outside
with a clear view of the
sky and then retry.
No
Contract
7
Check Remote
Service Flag Information
1101
Disconnect/Reconnect
the 12V battery, retry
registering the vehicle
from the MyMazda app,
and repeat from Step
1.
If the retry result is NG,
proceed to the next step
.
proceed to the next step![]()
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DIAGNOSTIC ASSIST FUNCTION [CMU] -> Telematics communication
system linked information verification -> Flag Information
Is the remote
service flag 1101 or 0000?
0000
Go to Mazda
Connected Vehicle Viewer (MCVV) and check
communication line status.
Example of Open Completed
8
Example of Closed Completed
If a MyMazda App error code is displayed, go to the "MYMAZDA App
Connected Vehicle (CV) Error Codes" table and perform Confirmation/
Recovery.
Check the harness (including connectors / terminals) between TEL
antenna No. 1 and TCU.
9
10
11
Disconnect/Reconnect
the 12V battery, retry
registering the vehicle
from the MyMazda app,
and repeat from Step
1.
If the retry result is NG,
proceed to the next step
.
Open
proceed to the next step![]()
Completed
Disconnect/Reconnect
the 12V battery, retry
registering the vehicle
Closed
from the MyMazda app,
Completed
and repeat from Step
1.
If the retry result is NG,
proceed to the next step
.
Yes
proceed to the next step![]()
No
Repair or replace the
defective part and verify
repair.
Check the harness (including connectors / terminals) between TEL
antenna No. 2 and TCU.
• Check the relevant circuit. (Reference: Circuit inspection) (Reference:
Connector
inspection)
• Is the circuit normal?
Yes
proceed to the next step![]()
No
Repair or replace the
defective part and verify
repair.
Check for SIM abnormality
Move the vehicle outside with a clear view of the sky.
Check M-MDS PID values
Yes
Replace the TCU.
No
proceed to the next step![]()
Yes
Replace anntena no.1.
No
proceed to the next step![]()
• Check the relevant circuit. (Reference: Circuit inspection)
(Reference: Connector
inspection)
• Is the circuit normal?
•
•
TEL1_ANT_6LVL
TEL2_ANT_6LVL
Are both values 0 (0 means out of service)?
*Note: Depending on the vehicle, ***6 LVL or ***3 LVL may be
displayed."
12
Check anntena no.1.
Move the vehicle outside with a clear view of the sky.
Check M-MDS PID value
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•
TEL1_ANT_6LVL
Does TEL1_ANT_6LVL indicate 0?"
Check anntena no.2.
Move the vehicle outside with a clear view of the sky.
Check M-MDS PID value
13
•
TEL2_ANT_6LVL
Yes
Replace anntena no.2.
No
"proceed to the next step![]()
(in case of both anntena
value is not equal to 0)"
Yes
Repair Complete.
No
Go to MGSS
MALFUNCTION
DIAGNOSIS FLOW
[CONTROLLER AREA
NETWORK (CAN)]
If CAN communication
has no problem, repeat
from step1 again.
If the problem is not
resolved, contact Hotline
for technical support.
Does TEL2_ANT_6LVL indicate 0?"
Verify
Repair
• Install/connect parts that were removed / disconnected during
fault diagnosis.
• Has the problem been resolved?
Troubleshooting Instructions
Step![]()
Inspection
Result
Action
Go to next step![]()
Good
reception
1.
Check CV reception strength icon
Weak
reception
Move vehicle
outside with a clear
view of the sky and
then retry
CV enrollment
needed.
Go to Online
No Contract Enrollment
2.
Perform CMU/TCU Communication Connectivity Test.
Go to MGSS -> Diagnostic Assist Function -> Service Information -> TCU
Linked Information.
Perform:
OK
Go to next step![]()
NG
Go to Step
5.
• CMU Communication Connectivity Test (CMU, TCU Connection)
• TCU Communication Connectivity Test (TCU, Carrier
Connection)
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Is the TCU software at the latest software version?
(2019 Mazda3, Confirm CMU software is at the latest version)
Go to MGSS Diagnostic Assist Function -> Service Information -> TCU Linked
Information -> TCU Software Version
3.
Yes
Go to next step
.
No
Update TCU
software
Go to MGSS -> Infotainment/TCU -> Telematics Communication Unit (TCU)
Updates and confirm at latest software version.
Check TCU CV Contract Status
a. Go to MCVV -> Select "Vehicle Communication Line Status Reference"
b. Enter VIN and then select "Search"
c. Is the Status Detail "Open Completed" or "Closed Completed"?
Example of Open Completed
4.
Example of Closed Completed
Open
Go to next step![]()
Completed
CV enrollment
Closed
needed
Completed Go to Online
Enrollment
5.
If possible, complete the Dealer Connected Vehicle Questionnaire
Go to MGSS -> Mazda
Connect Questionnaires -> Dealer Connected Vehicle Questionnaire
6.
If the problem is not resolved, contact Hotline for technical support.
Resources
MAZDA
CONNECTED SERVICES
Connected Vehicle Online Enrollment Information
1. Installing the MyMazda APP
2. Registering Your User Information
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3. Registering Vehicle Information
4. Registering Connected Service
WARRANTY INFORMATION
NOTE:
•
•
•
•
This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.
This repair will be covered under Mazda
’s New Vehicle Limited Warranty term.
Additional diagnostic time cannot be claimed for this repair.
Actual time beyond 0.9 hours will require DSA or Preauthorization for non DSA dealers. Actual time over 3 hours
for DSA dealers will require Preauthorization.
Dealer Confirmation/Recovery
Warranty Type
A
Symptom Code
64
Damage Code
99
Part Number Main Cause
Quantity
Operation Number / Labor Hours:
5555-24-003A
0
YY844XRT
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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
Previous TSB | Next TSB |
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