Service bulletin H0X_Technical In

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)
Type	Service bulletin
NHTSA id	10131683
Published by NHTSA	2018-04-02
Manufacturer's number	H0X_Technical In
Manufacturer's date	2018-01-10
NHTSA component	ELECTRICAL SYSTEM:SOFTWARE

NHTSA's summary

Technical Instructions: EV Control ECU Software Update. Certain 2016-2017 Mirai

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

Electrical system, Software

Vehicles listed
TOYOTA MIRAI	2016, 2017

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

Other bulletins for the same vehicles and component
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T-TT-0392-16 Rev	2018-06-11. Service bulletin. TT: Some customers may experience Bluetooth connection issues after updating the Android Operating System to 5.x.x (Lollipop) or later.
T-TT-0385-16	2018-04-23. Service bulletin. Tech Tip: This Tech Tip is being provided to bring attention to the new location of the Entune/NAV/Map Update and Upgrade USB Directory. Click on the TIS tab, Diagnostics tab, Telematics tab, and the document is now located under the reference documents sections. This change has occurred to help speed up the updating process of this document.
TSB-0012-13 Rev2	2018-04-23. Service bulletin. TSB: Flash reprogramming allows the 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 Techstream ECU flash reprogramming process and outlines use of the Technical Information System (TIS) and the Calibration Update Wizard (CUW). Flash calibration updates can only be applied to the vehicle/ECU combination for which they are intended. ECUs have internal security that will not allow them to be programmed with another ECU?s information.
T-SB-0012-13 Rev	2018-04-02. Service bulletin. TSB: OBSOLETE NOTICE: September 14, 2016: This bulletin is now obsolete. Please see T-SB-0134-16.
H0X_Dealer Daily	2018-04-02. Service bulletin. Dealer Daily Message: Special Service Campaign H0X Certain 2016 ? 2017 Model Year Toyota Mirai EV Control ECU Software Update ? Special Service Campaign H0X Dealer Letter and Technical Instructions now available on TIS.
H0X_Dealer Packa	2018-04-02. Service bulletin. Dealer Package: The subject vehicles are voluntarily equipped with an event data recorder (EDR). The EDR only collects, stores, and allows retrieval of vehicle event data, including crash events. It DOES NOT control the operation of the vehicle or any crash safety systems. Due to a software error, the EDR data for ?Accelerator Pedal, % Full? will show a constant value of ?0,? and will not record another accelerator open position at the time an event is recorded. No other system uses this software output data.
H0X_Region Lette	2018-04-02. Service bulletin. Region Letter: The subject vehicles are voluntarily equipped with an event data recorder (EDR). The EDR only collects, stores, and allows retrieval of vehicle event data, including crash events. It DOES NOT control the operation of the vehicle or any crash safety systems. Due to a software error, the EDR data for ?Accelerator Pedal, % Full? will show a constant value of ?0,? and will not record another accelerator open position at the time an event is recorded. No other system uses this software output data.
H0X_Dealer Email	2018-04-02. Service bulletin. Dealer Email: The subject vehicles are voluntarily equipped with an event data recorder (EDR). The EDR only collects, stores, and allows retrieval of vehicle event data, including crash events. It DOES NOT control the operation of the vehicle or any crash safety systems. Due to a software error, the EDR data for ?Accelerator Pedal, % Full? will show a constant value of ?0,? and will not record another accelerator open position at the time an event is recorded. No other system uses this software output data.
H0X_Region Email	2018-04-02. Service bulletin. Region Email: The subject vehicles are voluntarily equipped with an event data recorder (EDR). The EDR only collects, stores, and allows retrieval of vehicle event data, including crash events. It DOES NOT control the operation of the vehicle or any crash safety systems. Due to a software error, the EDR data for ?Accelerator Pedal, % Full? will show a constant value of ?0,? and will not record another accelerator open position at the time an event is recorded. No other system uses this software output data.