Toyota Avalon 2018–2020 — technical service bulletin
Bulletin T-TT-0580-19_Rev · NHTSA communication 10171406 · issued Jan 27, 2020
Technical service bulletin
communication type
Power Train
component
2018–2020
model years
12
vehicle entries
Official summary
TT: Currently under investigation. Please contact TAS if you have a vehicle that exhibits a leak from the Transmission Side Cover with no signs of damage or other conditions unrelated to regardless of miles or months in service. If it?s a Sunday or holiday continue with diagnosis and repair, save all parts and details, contact TAS on the next available work day and review details with TAS engineer.
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.