# U0300 on the 2022 Mazda MX\-30

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name U0300

- [10209751](https://open.wenmarpro.com/bulletins/10209751), 2022-04-06: 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.
- [10209748](https://open.wenmarpro.com/bulletins/10209748), 2022-04-06: 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.
- [10208561](https://open.wenmarpro.com/bulletins/10208561), 2022-03-04: CX\-30. Mazda3: 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. Customers having this concern should have their vehicle repaired using the following repair procedure. 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.