Toyota Tundra 2019–2021 — technical service bulletin
Bulletin T-SB-0087-21 · NHTSA communication 10203529 · issued Oct 1, 2021
Technical service bulletin
communication type
Power Train
component
2019–2021
model years
3
vehicle entries
Official summary
TSB: Some 2019 ? 2021 model year Tundra vehicles may exhibit a ?High Transmission Fluid Temp? warning message on the instrument cluster Multi-information Display (MID) when towing in tow/haul mode at highway speeds. The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to address this drive mode condition. Follow the Repair Procedure in this bulletin to address this condition.
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.