# NHTSA recall 25V859000

A recall listed here may apply to a vehicle of this year, make and model. Only the manufacturer can say whether it applies to one vehicle: check the VIN with the official lookups.

- Published by: NHTSA \(United States\)
- Campaign number: 25V859000
- Manufacturer's number: RN5
- Manufacturer: Honda \(American Honda Motor Co.\)
- Reported: 2025\-12\-11
- Owners notified: 2026\-05\-01
- Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:MASTER CYLINDER
- Units potentially affected: 70658
- Part numbers: 46100\-TV9\-A02

## What is wrong

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

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.


## Remedy progress the manufacturer reported

- Report: Quarterly report 1, for 2026 quarter 2
- Filed with NHTSA: 2026\-07\-20
- Vehicles in the campaign: 70658
- Reported remedied: 14812 \(20%\)
- Reported unreachable: 334
- Reported removed: 6497

These are the manufacturer's totals for the whole campaign at the end of 2026 quarter 2, as filed with NHTSA. They do not say whether one vehicle has been remedied: check the VIN with the official lookups. The reports are from data as of 2026\-10\-19.

## Vehicles this campaign lists

- [2016 ACURA ILX](/makes/acura/ilx/2016/recalls.md). Built from 2014\-10\-09.
- [2017 ACURA ILX](/makes/acura/ilx/2017/recalls.md)
- [2018 ACURA ILX](/makes/acura/ilx/2018/recalls.md)
- [2019 ACURA ILX](/makes/acura/ilx/2019/recalls.md)
- [2020 ACURA ILX](/makes/acura/ilx/2020/recalls.md). Built to 2020\-01\-29.

## Investigated as PE25015

This recall followed 1 NHTSA investigation. An investigation is NHTSA looking into a possible defect. It is not a finding that a defect exists, and it does not say that any one vehicle is affected.

- PE25015: Preliminary evaluation, opened 2025\-10\-23, closed 2026\-05\-21. Loss of braking force. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:MASTER CYLINDER.

From NHTSA's investigation file, as of 2026-10-19. JSON: [/v1/recalls/nhtsa/25V859000/investigations](/v1/recalls/nhtsa/25V859000/investigations)

## Check a VIN

- [NHTSA recall lookup by VIN, United States](https://www.nhtsa.gov/recalls)
- [Transport Canada recall search, Canada](https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng)

JSON: [/v1/recalls/nhtsa/25V859000](/v1/recalls/nhtsa/25V859000)

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