Toyota bulletin 23TC01a
What it saysRL: The subject vehicles are equipped with Toyota Safety Sense (TSS) which consists of several driving assist features, including pre-collision braking, lane departure warning, and more. NHTSA’s full summary ↓
Toyota filed this with NHTSA as a service bulletin dated Aug 31, 2023, received Oct 2, 2023, about the forward collision avoidance. It names 3 model years (2023). 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 communicationRL: The subject vehicles are equipped with Toyota Safety Sense (TSS) which consists of several driving assist features, including pre-collision braking, lane departure warning, and more. Due to the programming of the software within the forward recognition camera, there is a possibility that under certain conditions, TSS functions could become inoperative for approximately 4 seconds before rebooting and becoming operational again.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23TC01a | Service bulletin | Aug 31, 2023 | 10243080 | 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.
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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 285 complaints with NHTSA since 2015. 99 of them name Electrical System, Forward Collision Avoidance — 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.
UNKNOWN , 11/26/2024 car in garage would not start, car was tow to Toyota and Toyota replaced the battery. then on 02/06/2025 vehicle was in garage and would not start and vehicle was tow again to Toyota dealer. Where dealer replaced 12 volt battery at 5,283 miles. And told us to put a battery charger on the battery
2023 Toyota bZ4X · Electrical System · filed with NHTSA Jun 10, 2025 · ODI 11666165
I am writing to file a complaint regarding my 2023 Toyota GR Corolla Circuit Edition. The issue pertains to the ECU programming, which was not properly calibrated for the wheels that came with this model. Instead, the weight and dimensions from the Morizo Edition were utilized.
2023 Toyota Corolla · Forward Collision Avoidance · filed with NHTSA Jan 7, 2025 · ODI 11634755
It was the first day driving my brand new 2023 Corolla Cross XLE AWD to work in downtown Washington, DC. I pulled up to stoplight and the auto start/stop turned off the engine like normal.
2023 Toyota Corolla Cross · Electrical System · filed with NHTSA Mar 28, 2023 · ODI 11514155
In depth: 2023 Toyota Corolla Cross electrical 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 forward collision avoidance
Source: same model, same component group1 other manufacturer communication filed against these Toyota models under the same component group (forward collision avoidance), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 25TC03 | Service campaign | Jul 11, 2025 | Included vehicles are equipped with Toyota Safety Sense (TSS) 3.0, which includes the Pre-Collision System (PCS), which uses the forward rec… |
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 23TC01a 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 23TC01a 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 23TC01a cover?
The manufacturer filed it against 3 model years: 2023 Toyota Corolla, 2023 Toyota Corolla Cross, 2023 Toyota bZ4X. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.