Mazda CX-30 2019–2021 — technical service bulletin
Bulletin 09-020-21-3804 · NHTSA communication 10199716 · issued Jul 7, 2021
Technical service bulletin
communication type
Structure
component
2019–2021
model years
5
vehicle entries
Official summary
Some vehicles may exhibit water leaking into the passenger compartment from the rear door through the bottom of the service hole behind the rear door trim during rain or when washing the vehicle. This is caused by one of the following: Since the material of the seal rubber is not resistant to surfactants, the rubber deteriorates when the vehicle is washed and allows water to penetrate into the seal rubber of the service hole cover. The lower tabs of the service hole cover may not have been completely engaged at the factory. To eliminate this concern, the service-hole cover has been modified. N
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.