Mazda MAZDA3 2019 — technical service bulletin
Bulletin SA-037-21 · NHTSA communication 10194774 · issued May 24, 2021
Technical service bulletin
communication type
Service Brakes
component
2019
model years
1
vehicle entries
Official summary
Some customers may experience an instrument cluster warning message "Safety and Driver Support Systems Partially Disabled" and DTC U0401:68 [VEHICLE CONTROL MODULE (US)] (Error signal received from PCM, DSC HU/CM, instrument cluster, or body control module (BCM)) stored. This may be caused by the customer riding the brake pedal.
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.