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Manufacturer recall number

Acura recall RN5

Acura calls it RN5. NHTSA filed it as campaign 25V859000 on Dec 11, 2025: service brakes, hydraulic on the 2016–2020 Acura ILX, 70,658 vehicles potentially affected. One recall, two numbers — the dealer quotes the manufacturer’s, the federal record carries NHTSA’s.

What NHTSA has under this number

Source: 49 CFR Part 573 filings
NHTSA campaignVehiclesComponentFiledAffectedSeverity
25V8590002016–2020 Acura ILXService Brakes, HydraulicDec 11, 202570,658high
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. Fix 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.

The manufacturer’s own words as filed for 25V859000. Every model year it covers, the build window and the filed PDFs →

Two numbers, one recall

Every safety recall carries two identifiers. RN5 is the number Acura assigned in its own system: it is what appears on the owner letter, on the dealer’s service screen and on the repair order. 25V859000 is the number NHTSA filed the same recall under when the manufacturer reported it, and it is the one every federal record, this site included, is keyed on.

The repair is free by federal law for vehicles up to fifteen years old. Whether one particular vehicle is included is settled by its VIN against the manufacturer’s build list, not by its model year.

Check one specific vehicle

Both lookups check a VIN against the manufacturer’s own list and say whether the repair is still outstanding on that vehicle.

Common questions

Source: NHTSA, 49 CFR Part 573

Is RN5 the same recall as 25V859000?

Yes. RN5 is Acura’s own number for it; 25V859000 is NHTSA’s. One recall, two references.

Which vehicles does RN5 cover?

2016–2020 Acura ILX, 70,658 vehicles by the manufacturer’s count. A recall covers a build range, so the VIN decides whether one particular vehicle is in it.

Does the RN5 repair cost anything?

No. The manufacturer must remedy a safety defect at no charge for vehicles up to 15 years old from first sale.