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Service bulletins for the 2021 Toyota Mirai

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.

121 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Bulletins, newest first
T-SB-0064-18 Obs2024-04-15. Service bulletin. ELECTRICAL SYSTEM:IGNITION:ANTI-THEFT:IMMOBILIZER/PROXIMITY:KEY/SENDER. OBSOLETE NOTICE March 11, 2024: This bulletin is now obsolete. Please see T-SB-0013-24.
T-SB-0013-242024-04-15. Service bulletin. ELECTRICAL SYSTEM. TSB: The Immobilizer and Smart Key Reset is a feature that allows the registration of new keys when all master keys are lost. Once the system is reset, all previously registered keys will be erased and can never be reused. Another feature, Add/Remove Key, is also available. Once a key is removed, it can never be reused.
T-PANT-2024-004-2024-04-15. Service bulletin. ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION. This is to advise of various price adjustments that will affect Toyota Genuine Motor Oil and Long Life Coolant, effective March 1, 2024. These products are ordered through the Toyota Complete Maintenance Care (TCMC) website.
TSB0106222024-04-01. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM); UNKNOWN OR OTHER. TSB: Some 2018 ? 2022 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software. The SST is used with applicable vehicles to deliver the update, however, the process for generating license keys differs from previous generations. Before attempting to perform a map update, the expiration date of the dynamic subscription (stored in the head unit), must be checked. If the expiration date has not passed, a license key may be generated without the purchase of an Activation Card Number (ACN). Updating the map without the use of an ACN is considered an Embedded Navigation Update (refer to pg. 10) and performing this update does not extend the subscription to dynamic map services. If the subscription period has expired, or is expiring within the next 90 days, it should be recommended to the customer to purchase an ACN. Utilizing an ACN, will initiate the Dynamic Navigation Update (refer to pg. 4). This Dynamic Navigation Update will perform the embedded navigation update and provide dynamic map services for a period of two years from the date that the Dynamic Navigation Update is performed. ACNs are provided in a pamphlet available through the normal parts ordering system. Follow the process in this bulletin to perform the update.
TSB008523A2023-12-26. Service bulletin. ELECTRICAL SYSTEM:PROPULSION SYSTEM:HYBRID MANAGEMENT; ELECTRICAL SYSTEM. TSB: Some 2016 ? 2023 model year Toyota vehicles may exhibit a hybrid system warning lamp occurring in below-freezing temperatures (below 32°F or 0°C). After performing a Health Check, one or both of the following Diagnostic Trouble Codes (DTCs) may be present: ?P1C8449 ? (High Voltage Power Resource Circuit Short during Ready ON) ?P300449 ? (High Voltage Power Resource Circuit Short during Pre-Charge) Follow the Repair Procedure in this bulletin to address this condition.
TSB0047232023-12-26. Service bulletin. SUSPENSION. TSB: Some 2021 ? 2023 model Mirai vehicles may exhibit a creaking or clicking type noise from the rear suspension member. This condition may occur when braking or when driving over speed bumps and uneven surfaces. Follow the Repair Procedure in this bulletin to address this condition.
TSB0085232023-12-26. Service bulletin. ELECTRICAL SYSTEM. TSB: Some 2016 ? 2023 model year Toyota vehicles may exhibit a hybrid system warning lamp occurring in below-freezing temperatures (below 32°F or 0°C). After performing a Health Check, one or both of the following Diagnostic Trouble Codes (DTCs) may be present: ?P1C8449 ? (High Voltage Power Resource Circuit Short during Ready ON) ?P300449 ? (High Voltage Power Resource Circuit Short during Pre-Charge) Follow the Repair Procedure in this bulletin to address this condition.
TTT0738232023-10-16. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. TT: MIL On with DTCs P1F6C71 and/or P1F6E71
TSB0058232023-10-16. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:REFRIGERANT HOSES AND FITTINGS. TSB: The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. Follow the procedures outlined in this service bulletin to aid in locating, inspecting, and repairing refrigerant leaks
TSB0032202023-10-16. Service bulletin. VEHICLE SPEED CONTROL; AIR BAGS; EQUIPMENT. TSB: Replacement certification labels (the vinyl label installed on the driver door or door post) and VIN plates (the metal plate riveted to dashboard) (see Figure 1) for most 1979 ? 2023 model year vehicles may be available provided the requests meet the criteria listed in this Service Bulletin. Follow the Procurement Procedure in this bulletin to request a replacement certification label or VIN plate.
TTT0737232023-10-16. Service bulletin. COMMUNICATION:MANUFACTURER TELEMATICS; UNKNOWN OR OTHER. TT: A very small percentage of customers experience operational difficulties with some telematics features which they cannot resolve on their own. These resources, in conjunction with the Repair Manual, are for dealership personnel to assist those customers with user issues, user errors, and compatibility issues with other vehicle systems and external applications encountered while operating telematics features. Toyota has developed and provided the following Telematics Diagnostic Guide to assist dealer technicians.
T-SB-0047-232023-08-28. Service bulletin. ENGINE AND ENGINE COOLING; SUSPENSION; ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC); BACK OVER PREVENTION. TSB: Some 2021 ? 2023 model Mirai vehicles may exhibit a creaking or clicking type noise from the rear suspension member. This condition may occur when braking or when driving over speed bumps and uneven surfaces.
T-SB-0107-202023-08-28. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE. TSB: 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-0043-232023-08-28. Service bulletin. SERVICE BRAKES, HYDRAULIC. TSB: Some 2021 ? 2022 model year Mirai vehicles may exhibit a MIL ON condition with one or both of the following Diagnostic Trouble Codes (DTCs) present: ?P1F6C71 ? Air Sealing Valve Actuator Stuck ?P1F6E71 ? Air Pressure Regulating Valve Actuator Stuck
T-SB-0106-222023-01-17. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). TSB: Some 2018 ? 2022 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System, require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software. The SST is used with applicable vehicles to deliver the update, however, the process for generating license keys differs from previous generations. Before attempting to perform a map update, the expiration date of the dynamic subscription (stored in the head unit), must be checked. If the expiration date has not passed, a license key may be generated without the purchase of an activation card number (ACN). Updating the map without the use of an ACN is considered an Embedded Navigation Update (refer to pg. 10) and performing this update does not extend the subscription to dynamic map services. If the subscription period has expired, or is expiring within the next 90 days, it should be recommended to the customer to purchase an ACN. Utilizing an ACN, will initiate the Dynamic Navigation Update (refer to pg. 4). This Dynamic Navigation Update will perform the embedded navigation update and provide dynamic map services for a period of two years from the date that the Dynamic Navigation Update is performed. ACNs are provided in a pamphlet available through the normal parts ordering system
TSB004321Rev22022-10-17. Service bulletin. PARKING BRAKE; EQUIPMENT. TSB: Some 2020 model year vehicles equipped with Audio Plus (version 1021) or Premium Audio (version 1021) or earlier may exhibit one or more of the following conditions: ?Barge in function defaulted to OFF. ?Limited phone book grammar. ?Difficult Hand Free operation. ?Abnormal Electronic Owner?s Manual operation. ?Music does not automatically resume when using Android Auto?. ?Cover art is not displayed. ?Vehicle position is not sent to Destination Assist server. ?System inoperative after using the return button when using voice recognition.
TSB011120Rev12022-10-17. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). TSB: When certain vehicle ECUs are replaced, the ECU security key must be written in order for that ECU to communicate on the vehicle network. The Techstream Software Health Check Results screen has been enhanced to help identify if a replacement ECU requires an ECU security key.
22TD01TI2022-10-17. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. TI: TECHNICAL INSTRUCTIONS LIMITED SERVICE CAMPAIGN 22TD01 SOFTWARE UPDATE FOR EV CONTROL COMPUTER CERTAIN 2021 MODEL YEAR MIRAI VEHICLES
22TD01RL2022-10-17. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. RL: Due to improper programming in the EV Control Computer, under certain conditions, the vehicle may erroneously illuminate the warning message ?FCV system malfunction? in the instrument panel. Note: This message can be displayed for other issues unrelated to this Limited Service Campaign and should not be ignored.
22TD012022-10-17. Service bulletin. LANE DEPARTURE. DP: Due to improper programming in the EV Control Computer, under certain conditions, the vehicle may erroneously illuminate the warning message ?FCV system malfunction? in the instrument panel. Note: This message can be displayed for other issues unrelated to this Limited Service Campaign and should not be ignored.
TSB001221Rev22022-10-17. Service bulletin. STRUCTURE. TSB: Some 2010 ? 2022 model year Toyota vehicles may exhibit paint stains after the removal of Rapgard?. The paint stains may appear to be under the clear coat but are usually under wrinkles in the Rapgard?. The wrinkles may trap water and cause the paint to stain from the trapped moisture, especially on horizontal surfaces such as the hood, roof, and trunk. Follow the Repair Procedure in this bulletin to address this condition
22TD01TI2022-09-15. Service bulletin. EQUIPMENT:ELECTRICAL. TI: TECHNICAL INSTRUCTIONS LIMITED SERVICE CAMPAIGN 22TD01 SOFTWARE UPDATE FOR EV CONTROL COMPUTER CERTAIN 2021 MODEL YEAR MIRAI VEHICLES
22TD01RL2022-09-15. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. RL: Due to improper programming in the EV Control Computer, under certain conditions, the vehicle may erroneously illuminate the warning message ?FCV system malfunction? in the instrument panel. Note: This message can be displayed for other issues unrelated to this Limited Service Campaign and should not be ignored.
22TD012022-09-15. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. DP: Due to improper programming in the EV Control Computer, under certain conditions, the vehicle may erroneously illuminate the warning message ?FCV system malfunction? in the instrument panel. Note: This message can be displayed for other issues unrelated to this Limited Service Campaign and should not be ignored.
TSB001221Rev22022-09-15. Service bulletin. STRUCTURE. TSB: Some 2010 ? 2022 model year Toyota vehicles may exhibit paint stains after the removal of Rapgard?. The paint stains may appear to be under the clear coat but are usually under wrinkles in the Rapgard?. The wrinkles may trap water and cause the paint to stain from the trapped moisture, especially on horizontal surfaces such as the hood, roof, and trunk. Follow the Repair Procedure in this bulletin to address this condition

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.