Hyundai/Kia OEM Smart Key Fob – ID47 Chip, 433.92 MHz

Fitments for the Hyundai/Kia OEM Smart Key Fob span a broad roster of sedans, crossovers, SUVs, and sport-oriented platforms produced between 2017 and 2025. Vehicles covered include the Hyundai Sonata (2019), Hyundai Santa Fe (2018–2023), Hyundai Tucson (2020), Hyundai Kona (2017–2023), Hyundai Palisade (2018–2025), Hyundai Veloster (2018–2022), Hyundai Santa Cruz (2021), Hyundai Staria (2021), Hyundai Kauai (2017–2023), Kia Stinger (2017–2023), Kia K9 / K900 (2019), and Kia Cadenza (2017–2020). Across all of these platforms, the unit pairs an ID47 transponder with a 433.92 MHz RF carrier to handle both passive entry and push-button ignition. Each Hyundai/Kia OEM Smart Key Fob communicates with the vehicle’s smart-key ECU during a challenge-response handshake that authenticates the transponder before the immobilizer releases. Owners replacing the device should expect a programming procedure that requires diagnostic-level access to the vehicle. When ordering a Hyundai/Kia OEM Smart Key Fob, confirm that the part number etched on the back of the housing matches the OEM specification for the target model year, since minor revision differences can affect compatibility.

ID47 Transponder and 433.92 MHz Operation in the Hyundai/Kia OEM Smart Key Fob

The ID47 transponder inside this fob is a cryptographic chip widely adopted across modern Hyundai and Kia platforms. It generates a rolling authentication token each time the vehicle’s immobilizer antenna energizes it through inductive coupling. The 433.92 MHz radio frequency side of the key handles the “smart” functions—proximity detection, passive entry unlock, and remote trunk release—while the low-frequency transponder channel manages engine authorization. Both layers must authenticate independently before the push-button start sequence completes.

Because the ID47 operates on an AES-based encryption protocol, cloning from a single original is not straightforward without OEM-level seed data. Automotive locksmiths typically use advanced diagnostic tools that interface with the vehicle’s On-Board Diagnostics (OBD-II) port to register new fob serial numbers into the immobilizer’s memory. The exact pin-code or security-code retrieval method varies by model year and trim level, so technicians should verify their tool’s coverage chart before beginning the job.

Vehicle Fitment Details

The validated fitment list below groups covered vehicles by brand. While all entries share the same transponder technology and operating frequency, each model may use a distinct shell profile, button layout, or emergency key blade. Verifying the correct housing is just as important as verifying the correct electronics.

Hyundai Models

• Hyundai Sonata (2019) — mid-cycle refresh that moved the Sonata to this smart-key platform.
• Hyundai Santa Fe (2018–2023) — covers both the fourth-generation launch and subsequent facelift years.
• Hyundai Tucson (2020) — third-generation Tucson in its final production year before the full redesign.
• Hyundai Kona (2017–2023) — first-generation subcompact crossover; this fob also applies to the export-market Hyundai Kauai (2017–2023), which is the same vehicle sold under a different name in select regions.
• Hyundai Palisade (2018–2025) — Hyundai’s flagship three-row SUV for North America.
• Hyundai Veloster (2018–2022) — second-generation asymmetric hatchback, including N and Turbo trims.
• Hyundai Santa Cruz (2021) — sport-adventure pickup sharing its platform with the Tucson.
• Hyundai Staria (2021) — multi-purpose van available in global markets.

Kia Models

• Kia Stinger (2017–2023) — rear-drive sport sedan; the smart key supports all engine variants across the model’s production run.
• Kia K9 / K900 (2019) — Kia’s full-size luxury sedan, badged K9 in Korea and K900 in North America.
• Kia Cadenza (2017–2020) — front-drive executive sedan, discontinued after the 2020 model year.

If a vehicle appears on this list but falls outside the stated model-year range, the fob’s internal electronics are likely different even if the physical shell looks identical. Always cross-reference the OEM part number.

Programming Considerations for Locksmiths

Registering this smart key to a vehicle requires a diagnostic scan tool capable of accessing the body control module or dedicated smart-key ECU. The standard workflow involves reading the immobilizer status, entering a security access code (often derived from the VIN through a dealer-level database or through a tool-specific cloud calculation), and then following an on-screen guided procedure to write the new key’s serial number into the system.

Most current aftermarket programming platforms support ID47-based Hyundai and Kia vehicles, though coverage for the newest Palisade model years (2024–2025) can lag behind initial production. Technicians should update their tool firmware before arriving on-site.

One important procedural note: when the vehicle has zero recognized keys—commonly called an all-keys-lost scenario—the programming pathway changes significantly. Some models require EEPROM-level access to the immobilizer module, while others support OBD-based recovery as long as the correct security code is available. The specific method depends on the model, year, and module hardware revision.

OEM vs. Aftermarket Replacement Options

The factory-original version of this fob uses Hyundai/Kia-branded circuitry and housing. Aftermarket alternatives exist that replicate the board layout and transponder placement, often at a lower price point. However, aftermarket boards occasionally differ in RF output power or antenna tuning, which can reduce the effective proximity-detection range. For owners who rely on walk-up passive entry in large parking structures, an OEM-grade unit tends to deliver more consistent unlock range.

Regardless of whether the replacement is OEM or aftermarket, the ID47 transponder and 433.92 MHz radio must be present and functional. A fob that matches the shell but carries a different chip type will not authenticate with the immobilizer, and the engine will not start.

Emergency Blade Access

Most smart keys in this family include a concealed mechanical emergency blade. The blade slides into or folds out of the fob housing and is designed to operate the driver-side door lock cylinder when the fob’s battery is dead or the vehicle’s electrical system is compromised. The blade profile varies by model—Hyundai and Kia use several distinct keyway geometries across their lineup—so cutting a replacement blade requires identifying the correct blank for the specific vehicle.

When a locksmith cuts an emergency blade, the cut code is typically derived from the door-lock cylinder code rather than the ignition, since most of these push-button-start vehicles do not have a traditional ignition cylinder. Decoder tools designed for Hyundai/Kia internal-cut keyways simplify this process substantially.

Battery Replacement

A weak battery in the fob reduces both RF range and the strength of the low-frequency transponder response. Symptoms include intermittent failure of passive entry, a “key not detected” dashboard warning, or the need to hold the fob directly against the start button. The battery type is typically a CR2032 coin cell, though some variants use a CR2025. Consult the markings on the existing battery before purchasing a replacement. Swapping the cell requires opening the fob housing—usually via a small slot near the emergency blade release—and takes under a minute with no special tools.