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Acura ILX Recall 25V859: Contaminated Brake Fluid Can Cause Reduced Braking

NHTSA campaign 25V859, reported December 11, 2025, 70,658 vehicles potentially affected.

What this recall means for you

Certain 2016-2020 Acura ILX vehicles may have contaminated brake fluid. This can cause a seal inside the brake master cylinder to deform, leading to an internal brake fluid leak and reduced brake function.

Reduced brake function can increase the distance needed to stop, raising the risk of a crash or injury. Owners should not ignore brake warning signs and should check whether their vehicle is affected.

The repair is free: an authorized Acura dealer will replace the brake master cylinder at no charge. Owner letters were mailed May 4, 2026. You can contact Honda customer service at 1-888-234-2138 (recall number RN5), and you can check your VIN for open recalls on NHTSA.gov.

Check whether this recall is open on your vehicle

The repair is normally free at an authorized dealer.

Official recall notice

Safety recall 25V859Honda (American Honda Motor Co.)
Component
SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:MASTER CYLINDER
Problem
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.
Risk
Reduced brake function can extend the distance required to stop, increasing the risk of a crash or injury.
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.

Affected vehicles

Acura ILX20162017201820192020