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Service bulletin T-TT-0801-26

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 id11032478
Published by NHTSA2026-05-08
Manufacturer's numberT-TT-0801-26
Manufacturer's date2026-04-16
Campaign id or software versionT-TT-0801-26
NHTSA componentENGINE

NHTSA's summary

Some Customers for the above vehicles may have complaint of the following: unable to charge the vehicle using the supplied level 1 or 2 charger. Additionally, most will indicate one or more of the LEDs on the charger will illuminate at the time of no charge. Charging at other stations is still possible.

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

Engine

Vehicles listed
TOYOTA BZ2026
TOYOTA BZ4X2024, 2025
TOYOTA PRIUS PLUG-IN HYBRID2026 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA RAV4 PLUG-IN HYBRID2026 (the catalog's model; the bulletin names a series or trim of it)

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

Recalls for the same vehicles and component
26V6590002026-10-07. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
T-TT-0806-262026-08-12. Service bulletin. State of Health (SOH): An estimate of battery health that is updated as the vehicle learns from operating and charging conditions over time. Distance Since Last Update: Indicates the distance accumulated since the last SOH calculation. A default mileage value of 40,727 at SOH 100% may be displayed until sufficient vehicle learning is completed. Once SOH value updates from 100%, the Distance Since Last Update value will re-set to 0 miles. Both SOH and Distance Since Last Update values will continue to update as the vehicle continues to learn.
T-SB-0040-262026-08-12. Service bulletin. Some 2026 model year bZ, bZ Woodland, and C-HR BEV vehicles may exhibit the Diagnostic Trouble Code (DTC) U255221F associated with the level 3 DC fast charging. Under certain conditions, charging may either operate normally or experience failure, with a charging malfunction message displayed on the Multi-Information Display (MID). This condition is attributed to a control logic issue and potential voltage drop affecting Plug-In Charge Control Computer Assembly functionality. The control logic has been modified to reduce the possibility of this condition.
T-TT-0801-262026-04-08. Service bulletin. Some Customers for the listed vehicles may have complaint of the following: unable to charge the vehicle using the supplied level 1 or 2 charger. Additionally, most will indicate one or more of the LEDs on the charger will illuminate at the time of no charge. Charging at other stations is still possible.
T-TT-0784-25 Rev12025-07-10. Service bulletin. 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.
T-TT-0784-252025-07-10. Service bulletin. 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.
T-SB-0021-252025-04-08. Service bulletin. Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as field-fix procedures described in individual Service Bulletins. This bulletin details the Global Techstream+ (GTS+) ECU flash reprogramming procedures and outlines use of the Technical Information System (TIS) and the Calibration Update Wizard+ (CUW+). To ensure the correct ECU software is installed, ECUs will require a Security Signature before the ECU will initialize the flash reprogramming sequence. This bulletin also details the process for acquiring a Security Signature from TIS during the GTS+ ECU flash reprogramming process.
T-SB-0107-20 Rev22025-03-25. Service bulletin. OBSOLETE NOTICE February 11, 2025: This bulletin is now obsolete. Please see T-SB-0021-25.
T-SB-0025-252025-03-24. Service bulletin. Some 2024 model year bZ4X vehicles may exhibit a condition where the charging limit setting defaults to full after every key cycle, removing the upper limit set by the customer. The electric converter unit assembly software logic has been modified to address this condition.
T-SB-0021-252025-03-11. Service bulletin. Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as field-fix procedures described in individual Service Bulletins. This bulletin details the Global Techstream+ (GTS+) ECU flash reprogramming procedures and outlines use of the Technical Information System (TIS) and the Calibration Update Wizard+ (CUW+). To ensure the correct ECU software is installed, ECUs will require a Security Signature before the ECU will initialize the flash reprogramming sequence. This bulletin also details the process for acquiring a Security Signature from TIS during the GTS+ ECU flash reprogramming process.
T-TT-0770-242025-01-09. Service bulletin. Customers or Technicians may want to view the user manual or the troubleshooting guide for the Toyota EV Charger (Part Number PTQ64-00240). Basic operation and diagnostic troubleshooting information is not found in the vehicle’s Owner’s Manual or the Repair Manual.