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April 10, 2020 Service bulletin

When the Telematics Communication Unit (TCU) has been replaced or reprogrammed and the software is updated...

Mazda technical service bulletin 09-013-20-3663 for 2019 Mazda MAZDA3.

Bulletin number
09-013-20-3663
Component
Electrical system
Summary
When the Telematics Communication Unit (TCU) has been replaced or reprogrammed and the software is updated to ones shown below, DTC U2050:55-TCU (Activation of remote control not implemented) may be stored in memory with the message "In-Vehicle Network Malfunction" displayed in the multi-information display. - Japan built vehicles: BDGF-67CK2-B or later suffix. - Mexico built vehicles: BDTS-67CK2-A or later suffix. NOTE: The Description for DTC U2050:55-TCU will be added to MGSS. This is caused by a communication error between the TCU, the Connectivity Master Unit (CMU), and the Body Control Module (BCM) when the control software in them are not of the version being ready for activation of connected service. To correct this concern, the control software of the TCU, CMU and BCM have been modified. When you encounter this concern, reprogram (update) the BCM and the CMU to the latest version.

Owners of these vehicles have filed 11 complaints in the electrical category.

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