# Service bulletin T\-TT\-0639\-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: 10188911
- Published by NHTSA: 2021\-03\-15
- Manufacturer's number: T\-TT\-0639\-21
- Manufacturer's date: 2021\-02\-02
- NHTSA component: POWER TRAIN

## NHTSA's summary

TT: Customers may state they have a fluid leak from under the vehicle or technicians may notice a leak while performing other work.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10188911-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10188911-9999.pdf)

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

## Components

Transmission and driveline

## Vehicles listed

- 2020 to 2021 TOYOTA SUPRA

## Other bulletins for the same vehicles and component

- [T\-TT\-0591\-20](/bulletins/10171593.md), 2020-02-24, Service bulletin: PARKING BRAKE; POWER TRAIN; SEAT BELTS. TT: A message to replace the battery may indicate on the dash. This message can display when the voltage drops too low and is to assure the customer receives the vehicle with a fully charged battery. Due to the high amp draw when the vehicle is not shut down, this vehicle depletes the battery charge much quicker than other Toyota vehicles, so dealers must use care to maintain battery charge on their lot. Care should be made to use the key fob to lock the vehicle upon every exit of the vehicle. If you are going to remain in the vehicle, press and hold the power button on the radio.
- [T\-SB\-0151\-19](/bulletins/10167972.md), 2019-11-18, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. TSB: Flash reprogramming allows the Electric Control Unit \(ECU\) software to be updated without replacing the ECU. Flash calibration updates for the Supra are released as field\-fix procedures described in individual service bulletins. This bulletin details the ECU flash reprogramming process and outlines use of the Toyota\-ISTA Diagnostic Software. BEFORE beginning any reprogramming, ensure that the latest version of Toyota\-ISTA is downloaded and installed from TIS. NOTE ECU is a Toyota term used to describe integrated computerized devices responsible for managing the operation of a system or subsystem. For the purposes of this bulletin, the term ?ECU? is used as a generic label for the following SAE J1930 standard references: ? Powertrain Control Module \(PCM\) ? Engine Control Module \(ECM\) ? Transmission Control Module \(TCM\) ? Any other Toyota specific control unit

JSON: [/v1/bulletins/10188911](/v1/bulletins/10188911)

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