NHTSA campaign 18V921000 · Honda campaign A3O
Honda Recall 18V-921: Vehicle May Lose Power
NHTSA recall 18V921000 (Honda campaign A3O) was reported by Honda (American Honda Motor Co.) on December 20, 2018, with 1,082 vehicles potentially affected (per NHTSA). NHTSA's record lists the Honda Clarity Fuel Cell for model years 2017–2018. Owners were notified on February 14, 2019, 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 18V921000 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.
Honda VIN check: decode a VIN to see its year, make and model.
Key facts
- NHTSA campaign
- 18V921000 (also written 18V-921 or 18V921)
- Filed by
- Honda (American Honda Motor Co.)
- Honda campaign number
- A3O
- Report received
- Potentially affected
- 1,082 vehicles (per NHTSA)
- Component
- Electrical System — Software
- Owners notified
Repair completion: 98.33% (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 18V921000. 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.
Honda
Honda Clarity Fuel Cell
NHTSA's recall notice
As NHTSA's recall record states it for campaign 18V921000.
Defect description
Honda (American Honda Motor Co.) is recalling certain 2017-2018 Clarity Fuel Cell vehicles previously repaired under recall 18V-068. The previous software remedy may have been incomplete. As a result, the fuel cell control unit (FC-ECU) may misinterpret a small cell voltage drop, causing the vehicle to have a partial or complete loss of power.
Safety consequence
A loss of power can increase the risk of a crash.
Manufacturer remedy
Honda has notified owners, and dealers will update the FC-ECU software, free of charge. The recall began February 14, 2019. Owners may contact Honda customer service at 1-888-234-2138. Honda's number for this recall is A3O.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
Sources
Official NHTSA notice for recall 18V921000
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.