Toyota 4RUNNER 2015–2019 — technical service bulletin
Bulletin T-TT-0514-18 · NHTSA communication 10153202 · issued Dec 6, 2018
Technical service bulletin
communication type
Power Train
component
2015–2019
model years
5
vehicle entries
Official summary
TT: Intermittent high-pitched whine noise is heard when driving 45-70MPH.
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.