# Service bulletin T\-TT\-0521\-19

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: 10153246
- Published by NHTSA: 2019\-02\-19
- Manufacturer's number: T\-TT\-0521\-19
- Manufacturer's date: 2019\-01\-16
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

TT: The current engine active test ?Control the Injection Mode? is not operating as desired when controlling the direct injectors manually on 2GR\-FKS engines. When direct injection is started and then stopped using the active test, current ECU logic does not turn off the direct injectors and can cause DTCs P017200, P017500 and P0160300. To avoid this condition, technicians should raise engine RPM when changing back and forth between the Direct Injection and Port Injection active tests. Use the recommended procedure below to avoid this concern while testing injection mode of FKS equipped vehicles. NOTE: If the active test is used multiple times without using this procedure to raise engine RPM, it may be necessary to reset learning values for fuel trim and Air to Fuel ratio before returning vehicle to customer.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2019/MC-10153246-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2019/MC-10153246-9999.pdf)

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

## Components

Engine

## Trouble codes named

P0172, P0175

## Vehicles listed

- 2019 to 2020 TOYOTA AVALON
- 2018 to 2020 TOYOTA CAMRY
- 2019 TOYOTA COROLLA
- 2020 TOYOTA COROLLA HATCHBACK
- 2017 to 2020 TOYOTA HIGHLANDER
- 2020 TOYOTA RAV4
- 2017 to 2020 TOYOTA SIENNA
- 2016 to 2020 TOYOTA TACOMA

## Recalls for the same vehicles and component

- [20V162000](/recalls/nhtsa/20V162000.md), 2020-03-19: ENGINE; FUEL SYSTEM, GASOLINE:DELIVERY
- [2020039](/recalls/tc/2020039.md), 2020-02-06: Engine
- [20V064000](/recalls/nhtsa/20V064000.md), 2020-02-06: ENGINE AND ENGINE COOLING
- [2018148](/recalls/tc/2018148.md), 2018-03-28: Engine
- [18V200000](/recalls/nhtsa/18V200000.md), 2018-03-28: ENGINE AND ENGINE COOLING:ENGINE
- [17V356000](/recalls/nhtsa/17V356000.md), 2017-06-01: ENGINE

## Other bulletins for the same vehicles and component

- [T\-SB\-0110\-20 Rev2](/bulletins/11037202.md), 2026-09-09, Service bulletin: ENGINE. OBSOLETE NOTICE August 20, 2026: This bulletin is now obsolete. Please see T\-SB\-0051\-26.
- [T\-SB\-0051\-26](/bulletins/11037201.md), 2026-09-09, Service bulletin: ENGINE. This bulletin includes basic procedures for performing a rescue charge at battery on high voltage \(HV\) Ni\-MH and Li\-ion batteries.
- [24TE04](/bulletins/11037186.md), 2026-09-09, Warranty extension: ENGINE. Although the flow shut\-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles \(whichever comes first\), we at Toyota care about the customers’ ownership experience. Toyota is providing coverage for repairs related to Flow Shut\-off Valve Coolant Leak.
- [T\-SB\-0104\-21 Rev2](/bulletins/11029896.md), 2026-03-07, Service bulletin: ENGINE. OBSOLETE NOTICE February 27, 2026: This bulletin is no longer applicable and is now obsolete.
- [T\-SB\-0009\-26](/bulletins/11029893.md), 2026-03-07, Service bulletin: ENGINE. This bulletin includes basic procedures for performing a rescue charge on Ni\-MH high voltage \(HV\) batteries. This bulletin should be used in conjunction with the applicable model and model year Repair Manual while performing a rescue charge. The GRX\-5100 should be used wherever the Repair Manual references the Toyota Hybrid System \(THS\) charger.
- [T\-SB\-0119\-15 Rev2](/bulletins/11029892.md), 2026-03-07, Service bulletin: ENGINE. OBSOLETE NOTICE February 13, 2026: This bulletin is now obsolete. Please see T\-SB\-0009\-26.
- [22TC07](/bulletins/11026313.md), 2025-12-05, Other: ENGINE. Owner Renotification Letter Due to certain programing in the engine ECU, under certain conditions, the vehicle may stall at low speeds when accelerating from a stop. If this low\-speed vehicle stall occurs, steering and braking are not impacted, and the vehicle can be restarted immediately.
- [22TC07](/bulletins/11026312.md), 2025-12-05, Other: ENGINE. Owner Renotification Letter Due to certain programing in the engine ECU, under certain conditions, the vehicle may stall at low speeds when accelerating from a stop. If this low\-speed vehicle stall occurs, steering and braking are not impacted, and the vehicle can be restarted immediately.
- [T\-SB\-0088\-23 Rev2](/bulletins/11022961.md), 2025-09-09, Service bulletin: ENGINE. OBSOLETE NOTICE August 19, 2025: This bulletin is now obsolete. Please see T\-SB\-0059\-25.
- [T\-SB\-0059\-25](/bulletins/11022958.md), 2025-09-09, Service bulletin: ENGINE. Some 2020 – 2025 model year Corolla vehicles may exhibit a vibration or rattle noise from the right\-hand engine mounting insulator sub\-assembly. This condition will usually go away when the engine’s Revolutions Per Minute \(RPM\) are above idle. This condition is typically found on vehicles in warm climates/weather. No Diagnostic Trouble Codes \(DTCs\) are associated with this condition. This condition does not affect the operation of the vehicle.

JSON: [/v1/bulletins/10153246](/v1/bulletins/10153246)

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