Toyota bulletin T-SB-0021-25
What it saysFlash reprogramming allows the Electronic Control Unit (ECU) software to be updated without replacing the ECU. NHTSA’s full summary ↓
Toyota filed this with NHTSA as a service bulletin dated Feb 10, 2025, received Mar 11, 2025, about the engine — 2 documents under this number. It names 60 model years (2021–2025). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationFlash 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.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| T-SB-0021-25 | Service bulletin | Feb 10, 2025 | 11016782 | |
| T-SB-0021-25 | Service bulletin | Feb 10, 2025 | 11015496 |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themand 14 more on this site: 2025 Toyota Tacoma, 2024 Toyota Tacoma, 2025 Toyota Tundra, 2024 Toyota Tundra, 2023 Toyota Tundra, 2022 Toyota Tundra, 2021 Toyota Tundra, 2024 Toyota Venza, 2023 Toyota Venza, 2022 Toyota Venza, 2021 Toyota Venza, 2025 Toyota bZ4X, 2024 Toyota bZ4X, 2023 Toyota bZ4X.
Also filed against model years this site has no page for: 2022 Toyota Redundant 86; 2023 Toyota Redundant 86; 2024 Toyota Redundant 86; 2025 Toyota Redundant 86; 2024 Toyota Redundant Land Cruiser; 2025 Toyota Venza Hybrid.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 54 model years this bulletin names have filed 3,996 complaints with NHTSA since 2015. 898 of them name Engine — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
On the 2023 Toyota Tundra, the 38 owners who gave an odometer reading for Engine reported it at a median of 39,660 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
Upon starting the vehicle on 8/6/2025 i received multiple warnings: advanced ultrasonic detecting and ranging system malfunction, Pre-Collision system malfunction, Parking Brake system malfunction, Check engine ECM malfunction, Vehicle stability control system malfunction Secondary collison brake system malfunction, It now take almost a…
2025 Toyota Tundra · Engine · filed with NHTSA Aug 7, 2025 · ODI 11678976
Intermittently as I press on the brake, the engine loses power, engine feels like it is going to die and the charge meter on the dash display drops to no charge. Right before the engine dies the engine regains charge on the dash display charge meter and the engine returns to normal. So far the engine has never totally died on me yet
2024 Toyota Crown · Engine · filed with NHTSA Oct 28, 2025 · ODI 11696024
It was around 7pm. It was raining & wipers were on. Auto stop/start setting is on. I was at a stop light waiting to turn left. The light turns green and I try to go, but the engine stalled. I was unable to move forward into the lane, and turn the wheel. A sign on the dashboard showed up saying "engine stopped, steering power low".
2022 Toyota Corolla Cross · Engine · filed with NHTSA May 29, 2025 · ODI 11663820
In depth: 2023 Toyota Corolla Cross engine problems → · 2024 Toyota Tundra engine problems → · 2023 Toyota Tundra engine problems → · 2022 Toyota Tundra engine problems →
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the engine
Source: same model, same component group83 other manufacturer communications filed against these Toyota models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Toyota list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| T-SB-0110-20 OBSOLETE | Service bulletin | Aug 20, 2026 | OBSOLETE NOTICE August 20, 2026: This bulletin is now obsolete. Please see T-SB-0051-26. |
| T-SB-0051-26 | Service bulletin | Aug 20, 2026 | This bulletin includes basic procedures for performing a rescue charge at battery on high voltage (HV) Ni-MH and Li-ion batteries. |
| 26TC03 | Service campaign | Aug 17, 2026 | In wet conditions, water contacting the radiator in the subject vehicles after idling for an extended period can create steam that can cause… |
| 24TE04 | Warranty extension | Aug 11, 2026 | This Customer Support Program provides coverage as it applies to Flow Shut-off Valve Coolant Leak on Certain 2019-2021 Avalon & Avalon HV, 2… |
| T-TT-0806-26 | Service bulletin | Jul 22, 2026 | State of Health (SOH): An estimate of battery health that is updated as the vehicle learns from operating and charging conditions over time.… |
| 26TE03 | Warranty extension | May 7, 2026 | Although the Mirai Electric Heater Assemblies are covered by Toyota’s New Vehicle Limited Warranty for 3 years or 36,000 miles… |
| T-TT-0801-26 | Service bulletin | Apr 16, 2026 | Some Customers for the listed vehicles may have complaint of the following: unable to charge the vehicle using the supplied level 1 or 2 cha… |
| T-SB-0023-26 | Service bulletin | Apr 1, 2026 | Some customers may experience a rough running engine with a MIL ON P140018 DTC. Upon further inspection, a loose C90/C27 connector pin at th… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Toyota, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Toyota T-SB-0021-25 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the T-SB-0021-25 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every Toyota warranty extension on file lists the ones Toyota has filed.
Which vehicles does T-SB-0021-25 cover?
The manufacturer filed it against 60 model years: 2025 Toyota 4Runner, 2025 Toyota Corolla, 2024 Toyota Corolla, 2023 Toyota Corolla, 2025 Toyota Corolla Cross, 2024 Toyota Corolla Cross and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.