Mazda CX-30 2019–2020 — technical service bulletin
Bulletin SA-003/22 · NHTSA communication 10206943 · issued Jan 21, 2022
Technical service bulletin
communication type
Electrical System
component
2019–2020
model years
3
vehicle entries
Official 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, Mazda recommends putting customer in a loaner vehicle at this time. à ¢à  à ¢DO NOT perform BCM software update with MDARS until further notice, including CSP06 and CSP07. à ¢à  à ¢This SA will be updated with the newest repair i
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.