Honda · Known Issues

2017 Honda Clarity Problems: 1 Known Issue

2017 model year · 210+ owner reports · Updated October 2026

According to Au7o's analysis of 210+ owner reports, the 2017 Honda Clarity has 1 documented issue. None of the listed issues is rated critical; this is not a complete reliability assessment. The most commonly reported issue is 12V Auxiliary Battery Drain When Vehicle Sits Idle with 210 owner reports. Across all issues with published estimates, repair costs range from $25 to $250. DIY maintenance guides at au7o.io.

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All 1 Known Issue

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Community reported

210 owners

On the 2017-2021 Honda Clarity, the Honda Clarity PHEV and EV models experience 12V auxiliary battery drain when the vehicle is not driven for extended periods (7-14 days). Unlike conventional vehicles, the Clarity's 12V battery is relatively small and powers multiple always-on systems including the telematics module, keyless entry receiver, and battery management system monitoring. The 12V battery does not charge from the high-voltage battery when the vehicle is off, leading to a dead 12V battery that prevents the vehicle from powering on even if the main traction battery is fully charged.

Common Symptoms

Vehicle will not power on after sitting for a week or more
Dashboard completely dark when pressing the start button
Key fob does not unlock doors remotely
Clock and radio presets reset after jump-starting
Charging will not initiate even when plugged in

How to Fix

If the vehicle will sit unused for more than a week, connect a 12V battery tender or maintainer ($25-$40). The 12V battery is located under the front hood. If the 12V battery dies, use a jump starter or jumper cables on the 12V battery terminals under the hood to boot the vehicle, then let it run for 30 minutes to recharge. Replace the 12V battery with a high-quality AGM battery every 3-4 years proactively ($150-$250). Consider unplugging the OBD-II port if you have an aftermarket dongle connected, as these draw parasitic current.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

NOCO GENIUS1 1-amp 6V/12V smart charger and maintainer
OEMNOCO GENIUS1
Low-current maintenance charging when a Clarity will sit, after confirming battery chemistry and Honda connection precautions Fitment/availability: Works with 6V/12V flooded, gel, AGM, maintenance-free and supported lithium batteries usi…
NOCO

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Owner tips & cautions

TipA NOCO Genius1 or Battery Tender Junior ($25-$35) connected to the 12V battery when the car sits for extended periods completely eliminates this issue. Run the cable through the trunk seal — it compresses enough to close without damage.

Typical repair cost:$25 - $250

Research This Issue

Based on 210 owner reports

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Community Reported

High Confidence210 owner reportsLast reported by owners Mar 2026Reviewed Oct 27, 2026

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Frequently Asked Questions

What are the most common Honda Clarity problems?

According to Au7o's analysis of 210+ owner reports, the 2017 Honda Clarity has 1 documented issue. The documented issue is: 12V Auxiliary Battery Drain When Vehicle Sits Idle. None are rated critical, but regular maintenance is recommended.

Is the Honda Clarity reliable?

The 2017 Honda Clarity has 1 known issue documented across 210+ owner reports. None of the matching records is rated critical; this is not a complete reliability assessment. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Honda Clarity problems?

Repair costs for known Honda Clarity issues range from $25 to $250, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2017-2021 Honda Clarity 12V Auxiliary Battery Drain When Vehicle Sits Idle?

The Honda Clarity PHEV and EV models experience 12V auxiliary battery drain when the vehicle is not driven for extended periods (7-14 days). Unlike conventional vehicles, the Clarity's 12V battery is relatively small and powers multiple always-on systems including the telematics… Repairs typically run $25-$250. Severity: low.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.