Acura bulletin B23-013
What it saysThe client may notice a loss of auto function, or no function, of the sunroof glass/sunshade due to a Motor-Control Unit error code in the clock frequency check falsely detecting a failure. NHTSA’s full summary ↓
Acura filed this with NHTSA as a service bulletin dated Jul 17, 2023, received Jun 2, 2023, about the structure — 3 documents under this number. It names 10 model years (2019–2023). 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 communicationService Bulletin - The client may notice a loss of auto function, or no function, of the sunroof glass/sunshade due to a Motor-Control Unit error code in the clock frequency check falsely detecting a failure.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B23-013 | Service bulletin | Jul 17, 2023 | 10239706 | PDF, 122 KB |
| B23-013 | Service bulletin | Jul 17, 2023 | 10239510 | PDF, 122 KB |
| B23-013 | Service bulletin | May 23, 2023 | 10237173 | PDF, 112 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 70450-TJB-A52 | RDX Sunroof/Sunshade Motor Assembly | 2 | eBay Motors → |
| 91561-TA5-A11 | RDX RR. Pillar Garnish Clip | 2 | eBay Motors → |
| 70450-TYA-A51 | MDX Sunroof/Sunshade Motor Assembly | 2 | eBay Motors → |
| 70450-TJB-A51 | F For Sunshade | — | eBay Motors → |
| 70450-TYA-A02 | F For Sunshade | — | eBay Motors → |
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 729140 | Replace Moonroof motor | 2 hrs |
Read by machine from the document NHTSA serves (2 pages), read Oct 4, 2026. A part number is shown only where it matches Acura’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 sun/moon roof assembly for the 2023 MDX →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 10 model years this bulletin names have filed 1,630 complaints with NHTSA since 2015. 462 of them name Visibility/Wiper, Electrical System, Structure — 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 2019 Acura RDX, the 18 owners who gave an odometer reading for Visibility/Wiper reported it at a median of 63,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
while on vacation, upon entering the parked vehicle, the rear hatch window spontaneously shattered. No local place was open (Sunday) and the wait for a new window was days out so I had to drive two hours home with a makeshift windshield made from a tarp and duct tape. This is an obvious hazard as I could not see out the back window.
2022 Acura RDX · Visibility/Wiper · filed with NHTSA Mar 30, 2026 · ODI 11728077
The front bumper of the car is becoming unattached. There is a space underneath the headlights. The panel gap between the fender and front bumper has grown at the top, indicating the bumper is slipping from the top down. The problem appears to be getting worse. The plastic underneath the bumper is now becoming detached.
2022 Acura MDX · Structure · filed with NHTSA Jul 9, 2023 · ODI 11531192
The contact owns a 2023 Acura MDX. The contact stated that while driving 40 MPH, on a rough road, the "Brake" warning light illuminated, then several warning lights illuminated. In addition, the contact stated the vehicle went into LIMP Mode and failed to accelerate as intended while depressing the accelerator pedal.
2023 Acura MDX · Electrical System · filed with NHTSA Jun 24, 2025 · ODI 11668974
In depth: 2020 Acura RDX visibility and wiper problems → · 2019 Acura RDX visibility and wiper 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 structure
Source: same model, same component group23 other manufacturer communications filed against these Acura models under the same component group (structure), newest first. The eight newest are listed; the rest are on the Acura list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| B23-004 | Service bulletin | Oct 17, 2025 | Service Bulletin - A pop noise from the rear roof area occurs when turning into driveways, bumps, or on an incline. It was determined that… |
| BTI&05092025901 | Other | May 10, 2025 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2019-2025 RDXs and 2022-2025 MDXs with a client complaint of… |
| BTI&04252025901 | Other | Apr 25, 2025 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2019-2025 RDXs and 2022-2025 MDXs with a client complaint of… |
| B24-022 | Service bulletin | Feb 19, 2025 | Service Bulletin - The AWD warning light is on with one or more AWD DTCs having been set due to water intrusion into the electric oil pump m… |
| BTI&08152024901 | Other | Aug 16, 2024 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2022-2024 MDXs with a client complaint of the moonroof seal b… |
| BTI&07312024901 | Other | Jul 31, 2024 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2022-2024 MDXs with a client complaint of the moonroof seal b… |
| BTI&07152024901 | Other | Jul 16, 2024 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2022-2024 MDXs with a client complaint of the moonroof seal b… |
| BTI&07102024901 | Other | Jul 11, 2024 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2022-2024 MDXs with a client complaint of the moonroof seal b… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Acura, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Acura B23-013 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 B23-013 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 B23-013 cover?
The manufacturer filed it against 10 model years: 2023 Acura MDX, 2022 Acura MDX, 2021 Acura MDX, 2020 Acura MDX, 2019 Acura MDX, 2023 Acura RDX and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.