Honda bulletin A21-068
What it saysThe ACC system error message comes on while driving when outside temperatures are low/near freezing due to snow and ice getting stuck to the front of the millimeter wave radar. NHTSA’s full summary ↓
Honda filed this with NHTSA as a service bulletin dated Oct 25, 2023, received Sep 2, 2021, about the vehicle speed control — 2 documents under this number. It names 14 model years (2017–2021). 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 communicationService Bulletin - The ACC system error message comes on while driving when outside temperatures are low/near freezing due to snow and ice getting stuck to the front of the millimeter wave radar. This can cause DTC P2583-76 (Temporary stop of Integrated Driver Support System [Misalignment Millimeter Wave Radar]) to be stored.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| A21-068 | Service bulletin | Oct 25, 2023 | 10244663 | PDF, 103 KB |
| A21-068 | Service bulletin | Aug 31, 2021 | 10200833 | PDF, 99 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 36803-TLA-A03 | — | — |
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 7805J1 | Diagnose and inspect millimeter wave radar. Includes DTC clear | 0.3 hrs |
| A21068A | 36803-TLA-A03 7385A2 Update the millimeter wave radar software | 0.2 hrs |
| 7385A2 | Update the millimeter wave radar software | 0.2 hrs |
Read by machine from the document NHTSA serves (3 pages), read Oct 4, 2026. A part number is shown only where it matches Honda’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
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.
Find the vehicle speed control for the 2020 Accord →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
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 14 model years this bulletin names have filed 10,656 complaints with NHTSA since 2015. 3,821 of them name Forward Collision Avoidance, 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 2017 Honda CR-V, the 209 owners who gave an odometer reading for Electrical System reported it at a median of 20,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
On several occasions and almost never under similar circumstances, my entire Brake System suddenly shows there is a problem and flashes warnings on my dashboard - parking brake, power steering, vehicle stability assist, hill start assist, adaptive cruise control, collision mitigation, road departure systems - each systems shows there is…
2020 Honda Accord · Forward Collision Avoidance · filed with NHTSA May 10, 2024 · ODI 11588179
While my wife was driving my car on a busy road. The servo brake control unit/ pedal simulator broke making it near impossible to stop the car. She had to crash the car into a parking block. And Honda import/export is uncooperative and dismissive of the fact that my wife and daughters lives were jeopardized due to the part malfunctioning
2021 Honda Insight · Electrical System · filed with NHTSA Oct 31, 2025 · ODI 11696866
Started the car and was immediately received 4 messages: "lkas: lane keeping assist system problem. See your dealer.". "road departure mitigation system problem. See your dealer.", "blind spot information system problem. See your dealer.", "auto high_beam problem. Manual controls available. See your dealer.". Turn signals did not work.
2018 Honda Accord · Electrical System · filed with NHTSA Aug 1, 2019 · ODI 11241119
In depth: 2020 Honda Accord automatic emergency braking problems → · 2020 Honda Accord electrical problems → · 2019 Honda Accord automatic emergency braking problems → · 2019 Honda Accord 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.
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Honda, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Honda A21-068 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 A21-068 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 Honda warranty extension on file lists the ones Honda has filed.
Which vehicles does A21-068 cover?
The manufacturer filed it against 14 model years: 2020 Honda Accord, 2019 Honda Accord, 2018 Honda Accord, 2019 Honda CR-V, 2018 Honda CR-V, 2017 Honda CR-V and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.