Toyota 4RUNNER 2021–2024 — technical service bulletin
Bulletin T-SB-0075-23 · NHTSA communication 10245450 · issued Oct 5, 2023
Technical service bulletin
communication type
Engine and Engine Cooling
component
2021–2024
model years
4
vehicle entries
Official summary
TSB: Some 2021 ? 2024 model year 4Runner vehicles may exhibit a cyclic growl/groan noise from the front of the vehicle while driving in 2WD at around 30 ? 50 mph (48 ? 80 kph). The noise subsides when the vehicle is put into 4WD. This condition may be more prominent in colder temperatures. Follow the Repair Procedure in this bulletin to address this condition.
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.