NHTSA campaign 25V859000 · Manufacturer campaign RN5
Acura Recall 25V-859: Reduced Brake Function
- Recall influenced by NHTSA's Office of Defects Investigation
NHTSA recall 25V859000 (Manufacturer campaign RN5) was reported by Honda (American Honda Motor Co.) on December 11, 2025, with 70,658 vehicles potentially affected (per NHTSA). NHTSA's record lists the Acura ILX for model years 2016–2020. Owners were notified on May 1, 2026, per NHTSA.
Updated daily from NHTSA's recall files
Is my vehicle included?
This page lists, by model year, the vehicles NHTSA's recall record names for campaign 25V859000 in the model years try.vin imports (1995 and later); NHTSA's own record can list more. A model year on the list doesn't mean every vehicle of that year is included, and some may already have been repaired.
To see whether a specific vehicle is included and still needs the repair, enter its VIN at nhtsa.gov/recalls.
Acura VIN check: decode a VIN to see its year, make and model.
Key facts
- NHTSA campaign
- 25V859000 (also written 25V-859 or 25V859)
- Filed by
- Honda (American Honda Motor Co.)
- Manufacturer campaign number
- RN5
- Report received
- Potentially affected
- 70,658 vehicles (per NHTSA)
- Component
- Service Brakes, Hydraulic — Foundation Components — Master Cylinder
- Owners notified
Repair completion: 36.97% (latest rate the manufacturer reported to NHTSA; dataset updated October 21, 2026)
NHTSA cautions against comparing completion rates across recalls or manufacturers. How try.vin reads them.
Vehicles listed for this recall
NHTSA's recall record lists these vehicles for recall 25V859000. try.vin imports model years 1995 and later, so NHTSA's own list can be longer. Model years with a try.vin recall page link to it. Build dates are NHTSA's range for a model year (per NHTSA); a vehicle built in that range is not necessarily included.
NHTSA's recall notice
As NHTSA's recall record states it for campaign 25V859000.
Defect description
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.
Safety consequence
Reduced brake function can extend the distance required to stop, increasing the risk of a crash or injury.
Manufacturer 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.
Sources
Official NHTSA notice for recall 25V859000
Campaign details come from NHTSA's recall files, which try.vin imports once a day. The plain-language subject and the completion rate come from the U.S. Department of Transportation's Recalls Data dataset. How try.vin reads recall data.