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Service bulletins for the 2019 Mazda Mazda3

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

827 on file from NHTSA, as of 2026-10-19.

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Only bulletins with component: Body control module are shown. Show all

Bulletins, newest first
SA-003-22c2022-04-06. Service bulletin. ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM; ELECTRICAL SYSTEM:ADAS:HUD:SOFTWARE. Mazda3 and CX-30: Prior to February 8, 2022, some vehicles may store DTC U0300:57 (Body control module (BCM) internal malfunction) and cannot be erased after a BCM replacement or MDARS BCM software update (NOT with BCM update for SSPC5 or 4621B using MDRT). This is caused by a BCM-VCM software error. MX-30: Some MX-30 vehicles may store DTC U0300:57 (Body control module (BCM) internal malfunction) and cannot be erased after a BCM replacement or MDARS BCM software update. This is caused by a BCM-VCM software error. Mazda is aware of the issue and is working on a resolution. If there is an issue with this concern, Mazda recommends putting customer in a loaner vehicle at this time. •DO NOT perform BCM software update with MDARS until further notice. •This SA will be updated with the newest repair information as it becomes available.
SA-003/222022-02-04. Service bulletin. ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:BODY CONTROL MODULE:SOFTWARE; EQUIPMENT. Some vehicles may store DTC U0300:57 (Body control module (BCM) internal malfunction) after a BCM replacement or MDARS BCM software update (NOT with BCM update for SSPC5 or 4621B using MDRT) and the DTC cannot be erased. This is caused by a BCM-VCM software error. Mazda is aware of the issue and is working on a resolution. If there is an issue with this concern, Mazda recommends putting customer in a loaner vehicle at this time. •DO NOT perform BCM software update with MDARS until further notice, including CSP06 and CSP07. •This SA will be updated with the newest repair information as it becomes available.
09-013-20-3663c2020-12-03. Service bulletin. ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:SOFTWARE. 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. 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.
09-013-20-3663b2020-11-04. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM. 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.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.