# Service bulletin T\-TT\-0670\-21

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10203551
- Published by NHTSA: 2021\-11\-15
- Manufacturer's number: T\-TT\-0670\-21
- Manufacturer's date: 2021\-10\-14
- NHTSA component: POWER TRAIN

## NHTSA's summary

TT: For some 2021 Tundra and Sequoia vehicles, there may appear to be an ATF leak from the bellhousing area of the transmission. This condition is specifically focused on new vehicles and is typically found during the PDS inspection.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10203551-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10203551-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Vehicles listed

- 2021 TOYOTA SEQUOIA
- 2021 TOYOTA TUNDRA

## Other bulletins for the same vehicles and component

- [T\-SB\-0087\-21](/bulletins/10203529.md), 2021-11-15, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. 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.

JSON: [/v1/bulletins/10203551](/v1/bulletins/10203551)

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