# Service bulletin T\-TT\-0784\-25

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: 11020658
- Published by NHTSA: 2025\-07\-10
- Manufacturer's number: T\-TT\-0784\-25
- Manufacturer's date: 2025\-06\-13
- Campaign id or software version: T\-TT\-0784\-25
- NHTSA component: ENGINE

## NHTSA's summary

Some ECUs can set a DTC that is common with other ECUs. This can lead to accidental use of the wrong repair manual when diagnosing these type of DTCs.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11020658-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11020658-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2019 to 2022 TOYOTA AVALON HYBRID
- 2023 to 2025 TOYOTA BZ4X
- 2019 to 2025 TOYOTA CAMRY HYBRID
- 2023 to 2025 TOYOTA COROLLA CROSS HYBRID
- 2023 to 2025 TOYOTA COROLLA HYBRID
- 2019 to 2025 TOYOTA PRIUS
- 2017 to 2024 TOYOTA PRIUS PRIME
- 2020 to 2025 TOYOTA RAV4 HYBRID
- 2021 to 2024 TOYOTA RAV4 PRIME
- 2021 to 2024 TOYOTA VENZA HYBRID

## Recalls for the same vehicles and component

- [21V734000](/recalls/nhtsa/21V734000.md), 2021-09-22: HYBRID PROPULSION SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE
- [2020039](/recalls/tc/2020039.md), 2020-02-06: Engine
- [20V064000](/recalls/nhtsa/20V064000.md), 2020-02-06: ENGINE AND ENGINE COOLING

## Other bulletins for the same vehicles and component

- [T\-SB\-0034\-26 Rev1](/bulletins/11038383.md), 2026-10-08, Service bulletin: ENGINE. Some 2025 – 2026 model year Camry HV vehicles may exhibit a MIL ON condition with Diagnostic Trouble Code \(DTC\) P0A1B94 \(Drive Motor A Control Module Unexpected Operation\) stored. The logic in the Motor Generator Control ECU has been modified to address this condition.
- [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.
- [26TC03](/bulletins/11037196.md), 2026-09-09, Service campaign: ENGINE. TECHNICAL INSTRUCTIONS FOR EMISSION NONCOMPLIANCE RECALL 26TC03 Certain 2022 – 2025 Model Year RAV4 Incorrect Mass Air Flow Sensor Reading
- [26TC03](/bulletins/11037195.md), 2026-09-09, Service campaign: ENGINE. In wet conditions, water contacting the radiator in the subject vehicles after idling for an extended period can create steam that can cause an incorrect engine sensor reading. This can lead to a warning light, a rough\-running engine, or a potential engine stall while idling or operating at low speeds.
- [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.
- [26TC03](/bulletins/11036128.md), 2026-08-12, Service bulletin: ENGINE. TECHNICAL INSTRUCTIONS FOR EMISSION NONCOMPLIANCE RECALL 26TC03 Certain 2022 – 2025 Model Year RAV4 Incorrect Mass Air Flow Sensor Reading
- [26TC03](/bulletins/11036123.md), 2026-08-12, Service bulletin: ENGINE. TECHNICAL INSTRUCTIONS FOR EMISSION NONCOMPLIANCE RECALL 26TC03 Certain 2022 – 2025 Model Year RAV4 Incorrect Mass Air Flow Sensor Reading
- [26TC03](/bulletins/11036122.md), 2026-08-12, Service campaign: ENGINE. In wet conditions, water contacting the radiator in the subject vehicles after idling for an extended period can create steam that can cause an incorrect engine sensor reading. This can lead to a warning light, a rough\-running engine, or a potential engine stall while idling or operating at low speeds.
- [T\-SB\-0034\-26](/bulletins/11034827.md), 2026-07-08, Service bulletin: ENGINE. Some 2025 — 2026 model year Camry HV vehicles may exhibit a MIL on condition with DTC P0A1B94\(Drive Motor "A" Control Module Unexpected Operation\) stored. The logic in the MG ECU has been modified to address this condition.

JSON: [/v1/bulletins/11020658](/v1/bulletins/11020658)

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