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Service bulletin T-TT-0591-20

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10171593
Published by NHTSA2020-02-24
Manufacturer's numberT-TT-0591-20
Manufacturer's date2020-01-06
NHTSA componentPARKING BRAKE; POWER TRAIN; SEAT BELTS

NHTSA's summary

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.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Brakes, Seat belts, Transmission and driveline, Parking brake

Vehicles listed
TOYOTA SUPRA2020

Listing a model year does not mean every vehicle of it is concerned: the document says which.