Acura bulletin B24-022
What it saysThe AWD warning light is on with one or more AWD DTCs having been set due to water intrusion into the electric oil pump motor connector area corrodes the terminals. NHTSA’s full summary ↓
Acura filed this with NHTSA as a service bulletin dated Feb 19, 2025, received Dec 3, 2024, about the structure — 2 documents under this number. It names 10 model years (2016–2020). 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 AWD warning light is on with one or more AWD DTCs having been set due to water intrusion into the electric oil pump motor connector area corrodes the terminals.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B24-022 | Service bulletin | Feb 19, 2025 | 11015014 | PDF, 405 KB |
| B24-022 | Service bulletin | Nov 22, 2024 | 11011046 | PDF, 402 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 48900-5M0-003 | — | — | |
| 32114-TZ6-A01 | — | 1 | |
| 32114-TZ6-A02 | — | 1 | |
| 32114-TYS-A10 | — | 1 | |
| 48320-5M0-020 | — | 1 | |
| 48320-5M0-A00 | All Models | 1 | eBay Motors → |
| 48900-5M0-013 | Rear Differential Pump Motor | 1 | eBay Motors → |
| 90471-PX4-000 | Drain Plug Washer (18 mm) | 1 | eBay Motors → |
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 2191CN | 2016 MDX: Replace the rear differential pump motor and subharness (includes… | 0.7 hrs |
Read by machine from the document NHTSA serves (6 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.
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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 body for the 2020 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 1,683 complaints with NHTSA since 2015. 725 of them name Engine, 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 2016 Acura MDX, the 54 owners who gave an odometer reading for Engine reported it at a median of 66,701 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
Our Acura MDX has continued to have Auto Idle Stop issues since we purchased the vehicle. Sometimes the vehicle would not restart after being stopped at a traffic light. Most recently, an accident almost occurred when the vehicle stuck behind us at the traffic light tried to go around us while we were trying to get the engine started and…
2020 Acura MDX · Engine · filed with NHTSA May 23, 2023 · ODI 11523509
The car does not restart after it has turned off during an idle stop. This is part of the start/stop system. The stop/start feature will leave you stranded at stoplights due to a failure to restart the car. To restart, you must put the car in Park mode and hit the start/stop button at least twice to turn it off, then turn on the car.
2019 Acura TLX · Engine · filed with NHTSA Nov 23, 2022 · ODI 11494676
The car failed to turn back on after the auto stop fuction turned the engine off. This left me stranded at a green light. After a few seconds the car put itself in neutral and I slowly coasted to the side of the road as I was on a hill. It would not start for around 30 seconds, remained in accessory mode with the engine off.
2018 Acura TLX · Engine · filed with NHTSA Dec 21, 2022 · ODI 11498449
In depth: 2020 Acura MDX engine problems → · 2019 Acura MDX engine problems → · 2018 Acura MDX engine problems → · 2017 Acura MDX 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 structure
Source: same model, same component group31 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 |
|---|---|---|---|
| BTI&01062026901 | Other | Jan 6, 2026 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for 2024-2025 TLXs with a client complaint of a loose, mis-set, deformed… |
| 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… |
| 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 B24-022 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 B24-022 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 B24-022 cover?
The manufacturer filed it against 10 model years: 2020 Acura MDX, 2019 Acura MDX, 2018 Acura MDX, 2017 Acura MDX, 2016 Acura MDX, 2020 Acura TLX and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.