Acura Ilx, model years 2016 to 2020. Filed by Honda (American Honda Motor Co.) and reported to NHTSA on 11 December 2025. 70,658 vehicles potentially affected.
What the notice says Honda (American Honda Motor Co.) is recalling certain 2016-2020 Acura ILX vehicles. Contaminated brake fluid may cause a seal inside the brake master cylinder to deform, which can cause an internal brake fluid leak and reduce brake function.
Is your vehicle included? Check with your VIN at NHTSA, or ask a dealer. This page is an independent copy of the notice, kept so you can see what changed after it was published. It is not the authority, and the authority’s own text is the one to act on.
Honda's own number for this recall: RN5. That is the number on the owner letter and on the dealer paperwork. 25V859 is the number NHTSA gave the same campaign, and the number this page is filed under. They are one recall, written two ways.
What owners ask about this recall
- Which vehicles does recall 25V859 cover?
- Acura Ilx, model years 2016-2020.
- What is wrong with them?
- Honda (American Honda Motor Co.) is recalling certain 2016-2020 Acura ILX vehicles. Contaminated brake fluid may cause a seal inside the brake master cylinder to deform, which can cause an internal brake fluid leak and reduce brake function.
- What can happen if it is not put right?
- Reduced brake function can extend the distance required to stop, increasing the risk of a crash or injury.
- Is there a fix yet?
- Yes, and it is free. Dealers will replace the brake master cylinder, free of charge. Owner letters were mailed May 4, 2026. Owners may contact Honda's customer service at 1-888-234-2138. Honda's number for this recall is RN5.
- What should I do now?
- Check your own vehicle by its VIN with NHTSA, which is the record to act on. Honda calls this recall RN5, which is the number on the owner letter and the dealer paperwork.
Answered from the register this site holds. NHTSA is the record to act on.
What the authority says can happen if this is not fixed: “Reduced brake function can extend the distance required to stop, increasing the risk of a crash or injury.”
affected
in the notice
caught
| Campaign | 25V859 |
|---|---|
| Filed by | Honda (American Honda Motor Co.) |
| System at fault | Service Brakes, Hydraulic:Foundation Components:Master Cylinder |
| Reported to NHTSA | 11 December 2025 |
| Model years | 2016-2020 |
| Vehicles named | ACURA ILX |
What the notice says today
The defect
Honda (American Honda Motor Co.) is recalling certain 2016-2020 Acura ILX vehicles. Contaminated brake fluid may cause a seal inside the brake master cylinder to deform, which can cause an internal brake fluid leak and reduce brake function.
The consequence
Reduced brake function can extend the distance required to stop, increasing the risk of a crash or injury.
The remedy
Dealers will replace the brake master cylinder, free of charge. Owner letters were mailed May 4, 2026. Owners may contact Honda's customer service at 1-888-234-2138. Honda's number for this recall is RN5. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning December 17, 2025. The information in your report suggests that Honda (American Honda Motor Co.) may have been aware of this issue more than five business days before filing a report with NHTSA. Please be reminded that under Federal law, this agency is to be notified of all safety defect and/or noncompliance decisions within five business days. 49 CFR 573.6 Significant civil penalties can be assessed for this violation.
What it said before
Nothing has changed while we have been watching. We last read the wording of this campaign on 17 September 2026, and it matched the copy we already held.
That copy hashes to a69dc8a6886efd633a13bf083f397ced…, so if it is ever edited the change is provable rather than a matter of memory.
This is one of 583 notices in the record whose component field names service brakes, hydraulic. Across that group the median wait before owners were written to was 37 days.
Last checked . No change has been recorded in the wording.
The models named here, across their whole recall history
How to cite this record
Quoting the wording on this page means quoting a version, so the date belongs in the citation:
CarsMultiverse, recall 25V859, wording as read on 17 September 2026. https://carsmultiverse.com/recall/25v859/
The copy quoted above hashes to a69dc8a6886efd633a13bf083f397ced…. If the notice is reworded later, that fingerprint will not match, which is how a reader checks that the quotation was of the version we say it was.
The cross-border matches used on this site are deposited as a citable dataset: doi:10.5281/zenodo.22087136. The recall wording itself is published by the national authority named above and is theirs, not ours.
The recall record and its wording are published by the US National Highway Traffic Safety Administration and are US Government public domain. The dated archive, the comparison and any before-and-after above are CarsMultiverse. How fresh every engine behind this page is, is public on the status page. To check a specific vehicle, use NHTSA’s own VIN lookup.
Other Honda notices we hold
- 26V500: 2017-2023, 2025 CMX500, 2017-2023, 2025-2026 CMX300, and 2025 Honda SCL500 motorcycles
- 26V424: 2026 Pilot and Passport
- 26V423: 2018-2020 Odyssey
- 26V366: 2023-2026 CR-V Hybrid, Accord Hybrid, and 2025-2026 CR-V Fuel Cell EV
- 26V365: 2016-2022 Honda Pilot, 2017-2023 Ridgeline, 2019-2023 Passport, and 2014-2020 Acura MDX
- 26V306: 2024-2025 Honda Prologue and 2024 Acura ZDX
- 26V227: 2018-2022 Odyssey
- 26V194: 2025 CB1000SP motorcycles
All 256 Honda campaigns we hold · Every manufacturer in the record
The fingerprint of this notice
We take a SHA-256 of each of the three blocks of text the authority publishes and keep the first eight characters. As we last read campaign 25V859 on 23 August 2026, they were:
- Defect summary
ea3e2b95 - Consequence
d5ff79ea - Remedy
8149cef0
We first read this notice on 21 August 2026. It has not moved since. If it ever does, these characters will not match, and the change will be dated here.
The wording we hold for 25V859 · how the whole register is watched
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