Honda OEM Smart Key Fob (FCC ID KR5BTP) – Specs & Fitment Guide

Operating at 433.92 MHz and housing a 4A transponder chip, the Honda OEM Smart Key Fob (FCC ID KR5BTP) – Specs & Fitment Gu (FCC ID KR5BTP) provides proximity-based keyless entry and push-button start functionality for select Honda and Acura platforms. This unit carries the FCC registration ID KR5BTP, which ties it to a specific radio emission profile approved for use in North America. The fob communicates with the vehicle’s body control module over a short-range RF link, while its embedded transponder handles the cryptographic handshake required by the engine immobilizer. Owners who need to source or program the Honda OEM Smart Key Fob (FCC ID KR5BTP) should be aware that this product spans multiple vehicle variants, and confirming exact fitment before purchasing is essential. A correctly enrolled unit will allow seamless passive entry and ignition without removing the key from a pocket or bag.

Honda OEM Smart Key Fob (FCC ID KR5BTP) — Technical Overview

The KR5BTP smart key operates on the 433.92 MHz frequency band, which is the standard carrier for proximity remotes distributed through Honda key replacement and Acura dealer channels in the United States and Canada. Inside the housing, a 4A transponder chip manages the rolling-code authentication sequence that the vehicle’s immobilizer system requires before it will permit engine cranking. Because this SKU covers more than one model line, locksmiths and vehicle owners should verify the exact part number printed on the back of the original fob or cross-reference the VIN through Honda’s parts catalog before ordering a replacement.

It is worth noting that while the 4A chip designation and 433.92 MHz frequency are consistent with known documentation for this FCC ID, Honda has been known to revise internal electronics across production runs. Confirming the transponder type with the original key or a diagnostic tool capable of reading the immobilizer protocol is a prudent step before beginning any programming procedure.

Validated Vehicle Fitments

Based on verified data, the following vehicles are compatible with this smart key fob:

• Acura Integra (2022) — The revived Integra nameplate uses a proximity key system that pairs with the KR5BTP remote.
• Acura MDX (2022) — The fourth-generation MDX accepts this fob for both keyless entry and push-button ignition.
• Acura RDX — Certain model years of the RDX utilize the same FCC ID, though owners should confirm the production year against Honda’s parts database.

This device may fit additional Honda or Acura models beyond the list above. Because the KR5BTP designation spans multiple platforms, an automotive locksmith equipped with advanced diagnostics can confirm compatibility by reading the vehicle’s existing key data before enrollment.

Programming Considerations

Enrolling a new proximity remote to any of the compatible Acura models typically requires dealer-level or advanced aftermarket diagnostic equipment. The process involves writing the new fob’s transponder credentials into the vehicle’s immobilizer ECU, a step that cannot be completed with simple on-board key-learning sequences. Locksmiths familiar with Honda and Acura platforms will recognize this as a standard smart-key registration workflow — the tool communicates with the immobilizer module over OBD-II, authenticates with a security code or online session, and then registers the 4A chip embedded in the replacement fob.

For scenarios where every original key has been lost, a PIN or security code retrieval step is generally required before new fobs can be written. This additional layer of authentication protects against unauthorized key registration and is standard across modern Honda and Acura vehicles.

OEM vs. Aftermarket Sourcing

The Honda OEM Smart Key Fob (FCC ID KR5BTP) is available through authorized Honda and Acura parts departments as a genuine factory component. Aftermarket alternatives carrying the same FCC ID do exist; however, the internal transponder quality and RF consistency can vary between manufacturers. For critical applications — especially fleet vehicles or high-value models — sourcing the OEM unit reduces the risk of intermittent communication failures or premature battery drain.

Regardless of sourcing, the fob will still require professional programming to bind with the target vehicle. Purchasing a replacement unit alone does not make it functional; enrollment through a qualified locksmith or dealership technician remains a mandatory step.