Mazda MAZDA3 2019–2020 — technical service bulletin
Bulletin 09-007-21-3751 · NHTSA communication 10190962 · issued Apr 15, 2021
Technical service bulletin
communication type
Structure
component
2019–2020
model years
2
vehicle entries
Official summary
Some vehicles may exhibit that the glass run channel of the front door interferes with the rear door garnish. Since the front door glass run channel is not fixed to the door strongly enough for the following situations, cycles of door operation may result in interference and lead to damage on the seal rubber at the rear door. When the front door glass is closed, the glass run channel may be forced to move to the B pillar side. In very hot climates, the glass run channel may expand to the B pillar side.
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.