Toyota bulletin T-SB-0120-20
What it saysSome 2021 – 2024 model year Toyota vehicles may require the download and installation of vehicle specific software or configuration software when the Electronic Control Unit (ECU) is replaced. NHTSA’s full summary ↓
Toyota filed this with NHTSA as a service bulletin dated Apr 15, 2024, received Jan 25, 2021, about the engine — 4 documents under this number: T-SB-0120-20 Rev2 (2 filings), T-SB-0120-20 Rev and 1 more. It names 26 model years (2021–2024). 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 communicationSome 2021 – 2024 model year Toyota vehicles may require the download and installation of vehicle specific software or configuration software when the Electronic Control Unit (ECU) is replaced. GTS+ software has been modified to indicate when configuration software is required. A new Configure column has been added to the GTS+ Health Check Results screen to show when configuration software is available for a specific ECU. REVISION NOTICE April 18, 2024 Rev2: •Applicability has been updated to include 2024 model year Tundra, Tundra Hybrid, Venza Hybrid, bZ4X, Corolla, Corolla Cross, Corolla Cross Hybrid, Corolla Hybrid, Crown, GR Corolla, Corolla Hatchback, Prius, Prius Prime, Sequoia Hybrid, Highlander, Grand Highlander, Grand Highlander Hybrid, Land Cruiser, Tacoma, Tacoma Hybrid, and Mirai vehicles and 2023 model year Corolla Hatchback and Prius Prime vehicles. •The Introduction section has been updated. •The Operation Procedure section has been removed. •The Standard ECU Configuration Procedure and ECU Configuration Value Writing Procedure sections have been added.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| T-SB-0120-20 Rev2 | Service bulletin | Apr 15, 2024 | 11003640 | |
| T-SB-0120-20 Rev2 | Service bulletin | Apr 15, 2024 | 11003585 | |
| T-SB-0120-20 Rev | Service bulletin | Mar 15, 2023 | 10234325 | not found |
| T-SB-0120-20 | Service bulletin | Dec 11, 2020 | 10185777 | not found |
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 themAlso filed against model years this site has no page for: 2024 Toyota Redundant Land Cruiser.
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 25 model years this bulletin names have filed 2,544 complaints with NHTSA since 2015. 1,149 of them name Engine, Electrical System, Steering — 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.
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
The contact owns a 2024 Toyota Venza. The contact received notification of NHTSA Campaign Number: 25V595000 (ELECTRICAL SYSTEM). However, the part to do the recall repair was not yet available. The contact stated that while driving at an undisclosed speed, the screen displayed a black screen while the vehicle was in drive(D).
2024 Toyota Venza · Electrical System · filed with NHTSA Jan 20, 2026 · ODI 11712196
The contact owns a 2024 Toyota Grand Highlander Hybrid. The contact stated while accelerating from a complete stop, the vehicle failed to respond within 2-3 seconds and was nearly T-boned by another vehicle. The contact stated that the failure had been recurring intermittently while accelerating from a complete stop.
2024 Toyota Grand Highlander · Engine · filed with NHTSA Jun 18, 2025 · ODI 11667636
In depth: 2023 Toyota Corolla Cross engine problems → · 2023 Toyota Corolla Cross electrical problems → · 2024 Toyota Tundra engine problems → · 2023 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 group65 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. |
| 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… |
| 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-0104-21 OBSOLETE | Service bulletin | Feb 27, 2026 | OBSOLETE NOTICE February 27, 2026: This bulletin is no longer applicable and is now obsolete. |
| T-SB-0119-15 REV2 | Service bulletin | Feb 13, 2026 | OBSOLETE NOTICE February 13, 2026: This bulletin is now obsolete. Please see T-SB-0009-26. |
| T-SB-0009-26 | Service bulletin | Feb 13, 2026 | This bulletin includes basic procedures for performing a rescue charge on Ni-MH high voltage (HV) batteries. This bulletin should be used in… |
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-0120-20 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-0120-20 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-0120-20 cover?
The manufacturer filed it against 26 model years: 2024 Toyota Corolla, 2023 Toyota Corolla, 2024 Toyota Corolla Cross, 2023 Toyota Corolla Cross, 2024 Toyota Crown, 2023 Toyota Crown and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.