Toyota bulletin T-SB-0111-20
What it saysWhen certain vehicle ECUs are replaced, the ECU Security Key must be written in order for that ECU to communicate on the vehicle network. NHTSA’s full summary ↓
Toyota filed this with NHTSA as a service bulletin dated Apr 11, 2024, received Dec 21, 2020, about the electrical system — 3 documents under this number: T-SB-0111-20 Rev2 (2 filings) and 1 more. It names 41 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 communicationWhen certain vehicle ECUs are replaced, the ECU Security Key must be written in order for that ECU to communicate on the vehicle network. The GTS+ Software Health Check Results screen has been enhanced to help identify if a replacement ECU requires an ECU Security Key. REVISION NOTICE April 11, 2024 Rev2: •Applicability has been updated to include 2023 – 2024 model year 86, Corolla, Corolla Cross, Corolla Cross Hybrid, Crown, GR Corolla, Mirai, Prius, Prius Prime, RAV4 Prime, Sequoia Hybrid, Sienna Hybrid, Tundra, Tundra Hybrid, Venza Hybrid, and Yaris and 2024 model year bZ4X, Highlander, Highlander Hybrid, Grand Highlander, and Grand Highlander Hybrid vehicles. •The entire bulletin has been updated to represent GTS+ Software. July 08, 2022 Rev1: •Applicability has been updated to include 2022 model year 86, Corolla Cross, Mirai, Tundra, and Tundra Hybrid vehicles and 2023 model year bZ4X vehicles. Any previous printed versions of this bulletin should be discarded.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| T-SB-0111-20 Rev2 | Service bulletin | Apr 11, 2024 | 11003621 | |
| T-SB-0111-20 Rev2 | Service bulletin | Apr 11, 2024 | 11003566 | |
| T-SB-0111-20 | Service bulletin | Nov 6, 2020 | 10184541 | 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.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
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Model years it names
Source: as the manufacturer filed themAlso filed against model years this site has no page for: 2022 Toyota Redundant 86; 2023 Toyota Redundant 86; 2024 Toyota Redundant 86; 2023 Toyota Yaris.
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 37 model years this bulletin names have filed 2,903 complaints with NHTSA since 2015. 1,214 of them name Engine, Electrical System — 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.
I own a 2023 Toyota RAV4 XSE that currently has an active safety recall related to the instrument cluster/speedometer display going blank. My vehicle is experiencing this issue — the speedometer/instrument screen has gone completely blank, preventing me from seeing my speed, warning lights, or critical vehicle information while driving.
2023 Toyota RAV4 Prime · Electrical System · filed with NHTSA Feb 9, 2026 · ODI 11716664
The contact owns a 2021 Toyota Sienna Hybrid. The contact stated that the vehicle was experiencing inaccurate fuel gauge readings. The contact stated while starting the vehicle, the fuel gauge reading displayed that the fuel tank was empty; however, while the contact was attempting to refuel the vehicle at the gas station, she became…
2021 Toyota Sienna · Electrical System · filed with NHTSA Jun 24, 2024 · ODI 11596197
The contact owns a 2024 Toyota Rav4 Prime. The contact received notification of NHTSA Campaign Number: 25V595000 (Electrical System); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair.
2024 Toyota RAV4 Prime · Electrical System · filed with NHTSA Oct 27, 2026 · ODI 11774036
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 electrical system
Source: same model, same component group91 other manufacturer communications filed against these Toyota models under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Toyota list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 26TC01 | Service campaign | Sep 8, 2026 | An electrical connection for the rear window defogger may not have been installed correctly during vehicle assembly. Overtime, this can caus… |
| 26TC02 | Service campaign | Jun 25, 2026 | After calibrating a trailer and using the Trailer Backup Guide feature, subsequent use of this feature may result in a “Trailer not detected… |
| 22TE09 | Warranty extension | May 14, 2026 | Although the HV Floor Under Wire Harness and Rear Traction Motor Cable is covered by Toyota’s New Vehicle Limited Warranty for 3 years or 36… |
| T-SB-0029-26 | Over-the-air update | Apr 24, 2026 | A new head unit software update is available for 2023 – 2024 model year RAV4, RAV4 Hybrid, and RAV4 Prime vehicles equipped with Toyota Mult… |
| T-SB-0021-26 | Service bulletin | Mar 18, 2026 | Some 2020 – 2024 model year Highlander and Highlander Hybrid vehicles may exhibit a condition in which the air conditioner does not cool due… |
| T-SB-0106-22 OBSOLETE | Service bulletin | Jan 30, 2026 | OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T-SB-0001-26. |
| T-SB-0001-26 | Service bulletin | Jan 28, 2026 | Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool… |
| T-SB-0110-24 REV1 | Over-the-air update | Jan 6, 2026 | A head unit software update is available for 2022 – 2023 model year GR86 vehicles equipped with Toyota Multimedia software version 10 or ear… |
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-0111-20 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-0111-20 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-0111-20 cover?
The manufacturer filed it against 41 model years: 2024 Toyota Corolla, 2023 Toyota Corolla, 2024 Toyota Corolla Cross, 2023 Toyota Corolla Cross, 2022 Toyota Corolla Cross, 2024 Toyota Crown and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.