Honda OEM Remote Head Key FCC ID OUCG8D439HA – Specs & Fitment

Operating at 315 MHz with a PCF7936 transponder, the Honda OEM Smart Key Fob (FCC ID KR5TP-2) – Specs & Fitment G OEM Remote Head Key (FCC ID OUCG8D439HA) combines remote-lock functionality and mechanical ignition access in a single integrated housing. This unit carries the HON66 blade profile — a high-security keyway common across Honda and Acura platforms of this era — and transmits on the FCC-registered identifier OUCG8D439HA. Inside the fob sits the PCF7936 chip, which handles the cryptographic handshake between the key and the vehicle’s immobilizer module during each ignition cycle. Compatible vehicles rely on the 315 MHz RF link for remote functions such as door lock and unlock. A correctly enrolled Honda OEM Remote Head Key (FCC ID OUCG8D439HA) will start the engine only after the immobilizer ECU validates the transponder response, making proper programming essential to full operation.

Technical Specifications of the Honda OEM Remote Head Key (FCC ID OUCG8D439HA)

The FCC ID OUCG8D439HA designates the RF transmitter portion of this remote head key, confirming its authorization to broadcast at 315 MHz within the United States. The PCF7936 transponder embedded in the key head is a widely used immobilizer chip in this generation of Honda auto locksmith and Acura vehicles. It operates passively — powered by the inductive field generated by the antenna ring around the ignition cylinder — and returns an encrypted response that the immobilizer control unit must recognize before enabling fuel injection and spark.

The HON66 blade profile is a sidebar-style mechanical key with internal milling. Precision cutting is required, and the blade must be cut to match the vehicle’s lock cylinder exactly. Aftermarket blanks using the HON66 profile are available, but because this is a factory-original (OEM) part, the blade and electronics are matched to Honda’s specifications from production.

Vehicle Fitment

Based on verified fitment data, this remote head key is compatible with the following vehicle:

• Acura TL — model years 2004, 2005, 2006, 2007, and 2008

The Acura TL from this generation uses Honda’s immobilizer system and shares the HON66 keyway with other Honda-platform vehicles. Owners of 2004–2008 Acura TL models seeking an OEM-grade replacement should confirm the FCC ID printed on the back of their existing key matches OUCG8D439HA before ordering, as Honda used multiple FCC IDs across different trim levels and production runs during this period.

Programming and Immobilizer Enrollment

Adding the key to a 2004–2008 Acura TL requires both transponder registration and remote programming. The transponder enrollment process writes the PCF7936 chip’s unique identifier into the vehicle’s immobilizer ECU. Without this step, the blade will turn the ignition cylinder mechanically, but the engine will crank and immediately stall as the ECU blocks fuel delivery.

For the remote-control functions, a separate procedure synchronizes the 315 MHz transmitter with the vehicle’s body control module. On many Honda-platform vehicles from this era, the remote programming sequence can be completed through a driver-side on-board procedure involving a specific ignition-key-cycle pattern. However, transponder registration typically requires diagnostic equipment — either a professional-grade key programmer or Honda’s proprietary HDS (Honda Diagnostic System) tool. Automotive locksmiths with the correct hardware and PIN-code access can perform both procedures on-site.

It is worth noting that if all existing keys for the vehicle have been lost, the process becomes more involved. A locksmith will need to extract or obtain the vehicle’s security code and may need to reset the immobilizer module before new keys can be enrolled. This scenario generally increases both the time and cost of service.

HON66 Blade Profile: What Locksmiths Should Know

The HON66 keyway uses an internal-cut (laser-cut appearance, though technically milled) design with cuts on a single track along the blade’s flat side. Cutting requires a high-security key machine capable of internal milling — a standard edge-cut duplicator will not work. Code-cutting from the vehicle’s key code is the preferred method when an original is unavailable, as impression-based duplication is impractical with sidebar-style blades.

When cutting a replacement blade for this remote head key, locksmiths should verify that the blank’s transponder cavity accommodates the PCF7936 chip. OEM units ship with the chip already seated and molded into the key head, so no chip transplant is necessary when using a genuine Honda part.

OEM vs. Aftermarket Considerations

Factory-original remote head keys from Honda carry a higher price point than aftermarket clones, but they offer validated electronics, consistent RF performance at 315 MHz, and a blade blank manufactured to exact tolerances. Aftermarket alternatives using the same FCC ID and PCF7936 chip are available, though build quality can vary. Common issues with lower-cost clones include inconsistent button feel, reduced RF range, and blade blanks that require additional fitting during cutting.

For vehicle owners weighing the options, a genuine Honda unit eliminates compatibility questions. For locksmiths maintaining inventory, stocking the OEM version alongside a tested aftermarket alternative provides flexibility for different customer budgets without sacrificing programming reliability.

When to Contact a Locksmith

If the remote head key has stopped locking or unlocking the doors but still starts the engine, the issue is likely a depleted battery in the fob or a desynchronized remote — both straightforward fixes. If the key no longer starts the vehicle at all, the problem may lie with the PCF7936 transponder or the immobilizer module itself, and diagnostic equipment will be needed to isolate the fault.

A qualified automotive locksmith can cut the HON66 blade to code, program the transponder into the immobilizer system, and synchronize the remote — often completing all three tasks in a single on-site visit. This is typically faster and less expensive than dealership service for 2004–2008 Acura TL owners.