Toyota 4RUNNER 2020–2021 — technical service bulletin
Bulletin T-TT-0599-20 Rev · NHTSA communication 10190459 · issued Mar 16, 2020
Technical service bulletin
communication type
Electrical System
component
2020–2021
model years
25
vehicle entries
Official summary
TT: Vehicle control apps might not operate as expected at times due to preconditions (normal operating parameters) not being established, vehicle settings and/or network/cellular coverage concerns.
Vehicles covered
- 2020 Toyota 4RUNNER
- 2021 Toyota 4RUNNER
- 2021 Toyota Avalon
- 2020 Toyota Camry
- 2021 Toyota Camry
- 2020 Toyota C-HR
- 2021 Toyota C-HR
- 2021 Toyota Corolla
- 2020 Toyota Corolla Hatchback
- 2021 Toyota Corolla Hatchback
- 2020 Toyota Highlander
- 2021 Toyota Highlander
- 2021 Toyota Prius
- 2021 Toyota Prius Prime
- 2020 Toyota RAV4
- 2021 Toyota RAV4
- 2021 Toyota RAV4 Prime
- 2020 Toyota Sequoia
- 2021 Toyota Sequoia
- 2021 Toyota Sienna Hybrid
- 2020 Toyota Tacoma
- 2021 Toyota Tacoma
- 2020 Toyota Tundra
- 2021 Toyota Tundra
- 2021 Toyota Venza Hybrid
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.