Mazda CX-3 2017–2021 — technical service bulletin
Bulletin SA-007-23b · NHTSA communication 10233561 · issued Mar 27, 2023
Technical service bulletin
communication type
Power Train
component
2017–2021
model years
5
vehicle entries
Official summary
The rear differential case could develop a crack in the case, as shown below. NOTE: This could affect new vehicles just delivered to the dealer as well as customer vehicles. This concern is caused when the sliding bearing (1) in the coupling (2) is seized and causes the coupling component to fit loosely. The pinion shaft head (3) then contacts the differential case and causes a crack.
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.