TCU 4G Telematics Malfunction Error in Dash Fix.
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This TCU hardware device CAN NOT be removed from one car to another as the are VIN LOCKED to THE ORIGINAL CAR OFF THE PRODUCTION LINE, CAN NOT be reprogrammed either to work in another Car or Country.
CX-50 TCU update files can not be used in any other Mazda Models.
Mazda North America has released a TCU Software Update to Version 10038 for Mazda CX-50 to for MyMazda App communication issues.
PRIVATE Message Me ONLY Click HERE!
TCU means..
Telematics Communication Unit
The TCU is a small hardware unit under dash which DATA connects your MyMazda App (your phone) to the car for remote features and with Mazda Servers.
A new release TCU Driver Update Version10003 10004 10038 is specific for and only for Mazda CX-50.
While your Mazda Dealer should update this software when your car is in for scheduled Service it is not in most occasions OTA (Over The Air) not done either. Can be a catch 22 as owner must complain of an issue before most car Dealers touch anything computerized.
My advice if you are basic PC savvy, you should update your TCU and not wait for your Dealer to update.
Seriously it is Not difficult to do.
Included in this thread is a .Pdf called "TCU Update Procedure", this is Genuine Mazda Dealer instruction as is the TCU update file 10038.
Also a .Pdf on the Mazda Dealer notification or TSB.
If you want to update your CX-50s TCU Software yourself then you must download a small file (only abo
ut 10Mb) from a link I will provide you also with full easy instructions, however you must FORUM 'message' me by clicking on my Avatar and then "Message" or "Start conversation", and then ask for link to download and I will privately send you a download link of genuine TCU Driver for CX-50.
Yes as a Mazda man I strongly suggest you update your TCU as this interacts with MyMazda App and car communication with Mazda and your Telco provider for Data connection.
You can not do any harm as Mazda systems now will now only permit Genuine Mazda Updates.
I provide Mazda Owners with official help as a retired Mazda worker and also multiple Mazda Owner I only do what is right by the brand and you.
IF you want your Dealer to do the TCU Update you must complain of a particular issue like " "MyMazda App on my phone does not work as I can not unlock cars doors via my phone"
Added Below is a new .Pdf of 'Mazda OTA Update Instructions', however you must have at the minimum Mazda Connect version 11022 and TCU Driver 10038 already installed and working in CX-50, you then use this .Pdf Mazda OTA Update Instructions.
Note: All TCU Devices are a hardware Module inside car, these Modules once Activate (MyMazda App, etc) and in use CAN NOT be removed and installed in any another Mazda as they are VIN Locked to the original (your) car.
Just Like OEM Navigation SD-Card (if equipped) is VIN Locked.
****
TELEMATICS COMMUNICATION UNIT REMOVAL CX-50 INSTRUCTIONS in .Pdf Below
![Image]()
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Mazda Part No. DN4J-67-CM2 Battery TCU Back-up (3), Battery Cover (1), (2) Power Socket into TCU PCB.
Mazda TCU Back-up Batteries last 5 years then must be Renewed.
![Image]()
NEVER DELETE or UNINSTALL YOUR "MY MAZDA APP" FROM YOUR PHONE to FIX a Problem, IF YOU DO YOU WILL HAVE TO GET A MAZDA DEALER TO RE-REGISTER and RE-ACTIVATE YOUR PHONE, No Other Way to do this.
See the 43page .PDF Below about "MyMazdaApp CONNECTED VEHICLE ERROR CODE DESCRIPTION and RECOVERY Information" attached.
This TSB is from Mazda USA to NA Dealer Network and concerns all the Trouble Codes and how to rectify, access to MDARS and other model information is a requirement when having MYMAZDAAPP issues in North America.
Some Limited information applies to Mazda models in Europe and UK which use the MyMazdaApp. As an outdated TCU Driver can also create App user issues I decided to include TSB in this thread only, see page 42 of TSB.
This TCU hardware device CAN NOT be removed from one car to another as the are VIN LOCKED to THE ORIGINAL CAR OFF THE PRODUCTION LINE, CAN NOT be reprogrammed either to work in another Car or Country.
CX-50 TCU update files can not be used in any other Mazda Models.
Mazda North America has released a TCU Software Update to Version 10038 for Mazda CX-50 to for MyMazda App communication issues.
PRIVATE Message Me ONLY Click HERE!
TCU means..
Telematics Communication Unit
The TCU is a small hardware unit under dash which DATA connects your MyMazda App (your phone) to the car for remote features and with Mazda Servers.
A new release TCU Driver Update Version
While your Mazda Dealer should update this software when your car is in for scheduled Service it is not in most occasions OTA (Over The Air) not done either. Can be a catch 22 as owner must complain of an issue before most car Dealers touch anything computerized.
My advice if you are basic PC savvy, you should update your TCU and not wait for your Dealer to update.
Seriously it is Not difficult to do.
Included in this thread is a .Pdf called "TCU Update Procedure", this is Genuine Mazda Dealer instruction as is the TCU update file 10038.
Also a .Pdf on the Mazda Dealer notification or TSB.
If you want to update your CX-50s TCU Software yourself then you must download a small file (only abo
ut 10Mb) from a link I will provide you also with full easy instructions, however you must FORUM 'message' me by clicking on my Avatar and then "Message" or "Start conversation", and then ask for link to download and I will privately send you a download link of genuine TCU Driver for CX-50.
Yes as a Mazda man I strongly suggest you update your TCU as this interacts with MyMazda App and car communication with Mazda and your Telco provider for Data connection.
You can not do any harm as Mazda systems now will now only permit Genuine Mazda Updates.
I provide Mazda Owners with official help as a retired Mazda worker and also multiple Mazda Owner I only do what is right by the brand and you.
IF you want your Dealer to do the TCU Update you must complain of a particular issue like " "MyMazda App on my phone does not work as I can not unlock cars doors via my phone"
Added Below is a new .Pdf of 'Mazda OTA Update Instructions', however you must have at the minimum Mazda Connect version 11022 and TCU Driver 10038 already installed and working in CX-50, you then use this .Pdf Mazda OTA Update Instructions.
Note: All TCU Devices are a hardware Module inside car, these Modules once Activate (MyMazda App, etc) and in use CAN NOT be removed and installed in any another Mazda as they are VIN Locked to the original (your) car.
Just Like OEM Navigation SD-Card (if equipped) is VIN Locked.
****
TELEMATICS COMMUNICATION UNIT REMOVAL CX-50 INSTRUCTIONS in .Pdf Below
*
Mazda Part No. DN4J-67-CM2 Battery TCU Back-up (3), Battery Cover (1), (2) Power Socket into TCU PCB.
Mazda TCU Back-up Batteries last 5 years then must be Renewed.
NEVER DELETE or UNINSTALL YOUR "MY MAZDA APP" FROM YOUR PHONE to FIX a Problem, IF YOU DO YOU WILL HAVE TO GET A MAZDA DEALER TO RE-REGISTER and RE-ACTIVATE YOUR PHONE, No Other Way to do this.
See the 43page .PDF Below about "MyMazdaApp CONNECTED VEHICLE ERROR CODE DESCRIPTION and RECOVERY Information" attached.
This TSB is from Mazda USA to NA Dealer Network and concerns all the Trouble Codes and how to rectify, access to MDARS and other model information is a requirement when having MYMAZDAAPP issues in North America.
Some Limited information applies to Mazda models in Europe and UK which use the MyMazdaApp. As an outdated TCU Driver can also create App user issues I decided to include TSB in this thread only, see page 42 of TSB.
