Toyota Avalon 2018–2020 — technical service bulletin
Bulletin T-TT-0580-19 · NHTSA communication 10169406 · issued Nov 4, 2019
Technical service bulletin
communication type
Power Train
component
2018–2020
model years
12
vehicle entries
Official summary
TT: Some 2018-2020 model year UA80/UB80 transmission equipped models may experience a leak from the Transmission Side Cover. This issue is currently under investigation. Vehicles are being sought regardless of months in service or mileage. Only seeking vehicles with leaking transmissions with no other signs of damage to the side cover.
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.