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Honda Clarity Fuel Cell: Earlier Software Fix Incomplete

NHTSA campaign 18V921000 · Reported Dec 20, 2018 · Honda (American Honda Motor Co.)

high How serious is it? About this label

A loss of power while driving increases the risk of a crash. The notice does not tell owners to stop driving.

Key facts

NHTSA campaign number	18V921000
Reported to NHTSA	Dec 20, 2018
Manufacturer	Honda (American Honda Motor Co.)
Part affected	Electrical System:software
Vehicles covered	1 model/year combination, model years 2018
Do-not-drive advisory	No
Park-outside advisory	No
Repair	Free at any franchised dealer

What's wrong, in plain English

Some 2017-2018 Honda Clarity Fuel Cell vehicles previously repaired under an earlier recall may not have been fully fixed. The fuel cell control unit's software can misread a small drop in cell voltage, which can cause the vehicle to partly or completely lose power. Dealers will update the fuel cell control unit software again.

What you should do

1. Check your VIN at nhtsa.gov/recalls.
2. Contact a Honda dealer, or call Honda customer service at 1-888-234-2138.
3. The software update is free.

Where do I find my VIN, and what do I tell the dealer?

Your VIN is the 17-character code on the lower left of the windshield, on your registration and usually on your insurance card. Enter it at nhtsa.gov/recalls to see whether this recall is still open on your car. When you call the dealer, say you have an open safety recall and give them NHTSA campaign number 18V921000. More in how recalls work.

Affected vehicles (1)

2018 Honda Clarity Fuel Cell

Who to contact

Honda — official Honda recall lookup

Customer service: 1-888-234-2138

Any franchised dealer for the brand can do the repair. Phone numbers are taken from manufacturer sites and recent NHTSA notices; if one has changed, the number in your own recall letter is the one to use.

The bigger picture

Honda Electrical Recalls Cover Power Loss, Wiring and Camera Failures · all 12 Honda recalls in this area

Other Honda Clarity Fuel Cell recalls

Apr 18, 2019Honda Clarity Fuel Cell Water Pump May Failhigh

Official notice

Component: ELECTRICAL SYSTEM:SOFTWARE
Summary: 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 risk: A loss of power can increase the risk of a crash.
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.

Verify your specific vehicle by VIN at nhtsa.gov. Recall repairs are free of charge by law.