Some vehicles may store DTC U0300:57 (Body control module (BCM) internal malfunction) after a BCM...
Mazda technical service bulletin SA-003-22a for 2019-2021 Mazda MAZDA3 and 2020-2021 Mazda CX-30.
- Bulletin number
- SA-003-22a
- Component
- Electrical system
- Summary
- 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, contact Hotline for newest repair information. 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.
Owners of these vehicles have filed 40 complaints in the electrical category.
Vehicles covered
- Mazda MAZDA3 2019-2021 201920202021
- Mazda CX-30 2020-2021 20202021
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