Toyota Prius 2019–2020 — technical service bulletin
Bulletin T-TT-0605-20 · NHTSA communication 10174893 · issued Apr 7, 2020
Technical service bulletin
communication type
Power Train
component
2019–2020
model years
2
vehicle entries
Official summary
TT: Some 2019-2020 model year Prius vehicles may experience a whine/humming noise at 70-80 mph from the rear of the vehicle. This condition can occur on vehicles with less than 10,000 miles.
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.