Toyota bulletin TSB005923
What it saysTSB: Some drivers of 2020 ? 2022 model year Highlander Hybrid vehicles may be sensitive to the momentary transition from regenerative braking to hydraulic braking under certain driving conditions, such as while driving… NHTSA’s full summary ↓
Toyota filed this with NHTSA as a service bulletin dated Aug 29, 2023, received Oct 16, 2023, about the service brakes. It names 3 model years (2020–2022). 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 communicationTSB: Some drivers of 2020 ? 2022 model year Highlander Hybrid vehicles may be sensitive to the momentary transition from regenerative braking to hydraulic braking under certain driving conditions, such as while driving downhill, or turning with light brake pedal application. The brake actuator control module can be updated to improve brake feeling for this condition. Follow the Repair Procedure in this bulletin to address this condition.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| TSB005923 | Service bulletin | Aug 29, 2023 | 10244133 | 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 themA 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 3 model years this bulletin names have filed 1,154 complaints with NHTSA since 2015. 272 of them name Service Brakes, Air Bags — 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.
The contact owns a 2021 Toyota Highlander Hybrid. The contact received notification of NHTSA Campaign Number: 23V865000 (AIR BAGS); 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.
2021 Toyota Highlander · Air Bags · filed with NHTSA Jun 24, 2025 · ODI 11669012
The contact owns a 2021 Toyota Highlander Hybrid. The contact stated that upon starting the vehicle, the instrument panel lights were flashing. The vehicle then independently turned off and restarted repeatedly. The vehicle was towed to the dealer, where it was determined that the battery level was low and needed to be replaced.
2021 Toyota Highlander · Electrical System · filed with NHTSA Feb 26, 2026 · ODI 11720641
After driving on an interstate and having my foot on the brake - the car jumps forward and accelerates. It has done this for a couple years, and it continues to happen more frequently. Sometimes it just jumps forward when you are driving through town and go to slow down. This seems like a safety issue
2020 Toyota Highlander · Service Brakes · filed with NHTSA Jun 24, 2025 · ODI 11668825
In depth: 2021 Toyota Highlander airbag 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 service brakes
Source: same model, same component group4 other manufacturer communications filed against the Toyota Highlander under the same component group (service brakes), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 24TE05 | Warranty extension | Jan 30, 2025 | Although the Brake Booster and Brake Booster Pump Assemblies are covered by Toyota’s New Vehicle Limited Warranty for 3 years or 36,000 mile… |
| T-SB-0014-25 | Service bulletin | Jan 29, 2025 | Some 2017 – 2019 model year Highlander Hybrid vehicles may exhibit a condition in which the brake, ABS, and/or TRAC warning lights are on an… |
| 24TE01 | Service campaign | Nov 4, 2024 | This Customer Support Program provides coverage as it applies to Brake Booster and Brake Booster Pump Assemblies on Certain 2014-2016 Model… |
| TSB010421 | Service bulletin | Feb 15, 2024 | TSB: Some 2018 ? 2024 model year Toyota vehicles equipped with an A25A-FKS, A25A-FXS, M20A-FKS, or M20A-FXS engine may exhibit one or more o… |
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 TSB005923 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 TSB005923 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 TSB005923 cover?
The manufacturer filed it against 3 model years: 2022 Toyota Highlander, 2021 Toyota Highlander, 2020 Toyota Highlander. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.