2017-2021 Honda Clarity Fob/Remote: Programming, Part Numbers, and Replacement Costs

Key Fob Variants for the Honda Clarity

When replacing a key fob for your 2017-2021 Honda Clarity, it's crucial to get the correct version. While they may look similar, there are important differences. All fobs for this vehicle should have the FCC ID KR5V2X. However, you must also match the button configuration and, for Touring models, the driver memory settings.

• Button Configuration: Clarity fobs come with either 5 or 6 buttons. The functions typically include lock, unlock, trunk release, panic, and remote climate pre-conditioning. The exact configuration can vary, so it's essential to match your original fob.
• Driver Memory (Touring Models): For Clarity Touring trims, the fobs are linked to the driver's seat memory. These are often labeled as "Driver 1" and "Driver 2" on the back of the fob. While a generic or blank fob can be programmed to operate the car, it may not control the memory seat functions. If you have a Touring model, it's best to get the correct Driver 1 or Driver 2 fob to retain this feature.

The provided OEM part numbers (72147-TRT-A01, 72147-TRT-A11, 72147-TRW-A01, 72147-TRW-A11, 72147-TRW-A12, 72147-TRW-A21) correspond to these different variations. For example, part number 72147-TRW-A11 has been identified as a "Driver 1" fob.

Symptoms of a Failing Fob/Remote

Most fob-related issues are due to a weak or dead battery. However, other symptoms can point to a failing fob or an issue with the vehicle's receiver.

• "Key Not Detected" Warning: The most common symptom is a message on the dashboard stating the key is not detected, even when it's inside the car. This is often the first sign of a weak fob battery.
• Intermittent Operation: The doors may not unlock consistently when you touch the handle, or the push-button start may not work on the first try.
• Reduced Range: You may have to be much closer to the vehicle than usual for the remote buttons to work.
• Rapid Battery Drain: If you find yourself replacing the fob battery every month or so, the fob itself may have an internal fault causing a constant power draw. This can sometimes happen if the fob has been damaged by water.
• Buttons Unresponsive: One or more buttons may stop working entirely, while others function normally.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

As of this writing, there are no specific recalls or TSBs issued by the National Highway Traffic Safety Administration (NHTSA) for the key fob/remote system of the 2017-2021 Honda Clarity. However, there are a few related recalls for the Clarity:

• NHTSA Recall 23V-858: Affects 2018-2019 Clarity PHEV models. The fuel pump inside the fuel tank may fail, potentially causing an engine stall. The remedy is to replace the fuel pump module. This is not related to the key fob, but is an important safety recall for the vehicle.
• NHTSA Recall 20V-382: Affects 2019 Clarity models. The rear seat belt assemblies may have a locking mechanism that does not work as intended, increasing injury risk in a crash.

While not a recall, some owners have reported issues with rapid battery drain in their fobs, which can sometimes be caused by accidental button presses in a pocket or a faulty fob.

Buying a Used Fob/Remote: What to Look For

Purchasing a used OEM fob can be a cost-effective alternative to buying a new one from a dealer, but it requires careful verification to ensure compatibility.

1. Verify the FCC ID: The most critical step is to ensure the used fob has an FCC ID of KR5V2X. This ID is usually printed on the back of the fob or inside the case. Fobs with a different FCC ID will not work with your vehicle.
2. Match the Button Count: Count the buttons on your original fob and ensure the used one is identical. A fob with a different button layout cannot be programmed to your car correctly.
3. Check for Physical Damage: Inspect the fob for cracks in the casing, excessive wear on the buttons, or signs that it has been pried open, which could indicate water damage or a failed repair attempt.
4. Understand Driver 1/2: If you have a Touring model, a used fob (even a blank one) can be programmed by a locksmith or dealer to function as either Driver 1 or Driver 2. However, buying one that already matches your need (e.g., you lost Driver 1, so you buy a used Driver 1) can sometimes simplify the process.

Programming and Replacement Costs

The 2017-2021 Honda Clarity does not have a do-it-yourself (DIY) programming procedure for new key fobs. Professional programming is always required because the fob must be paired with the vehicle's immobilizer system. This is an anti-theft measure.

• Honda Dealer: The dealer is the most expensive but most reliable option. They have the guaranteed correct equipment (Honda Diagnostic System or HDS) to program the key.
• Automotive Locksmith: A qualified automotive locksmith can also program Honda smart keys, often for a significantly lower price than the dealer. Always confirm with the locksmith beforehand that they have the specific equipment needed for a 2017-2021 Honda Clarity.

Important: When a new key is programmed, all existing keys must be present. Any key not present during the programming session will be de-registered from the car and will no longer work.

Frequently Asked Questions (FAQ)