Aftermarket 3-Button Remote Head Key (FCC ID LXPT003) – HU100 Blade
Sourcing decisions for the Aftermarket 3-Button Remote Head Key (FCC ID LXPT003) split between OEM and aftermarket paths, and this particular unit represents a cost-effective aftermarket option for several popular Chevrolet models. An OEM remote head key from the dealer typically carries a premium price tag along with original branding; aftermarket variants of this fob deliver equivalent function — lock, unlock, and trunk/hatch release — at a fraction of the cost. The Aftermarket 3-Button Remote Head Key (FCC ID LXPT003) requires proper transponder programming and remote pairing regardless of sourcing origin. For technicians, every variant built to this specification uses the same PCF7937E transponder chip and 315 MHz remote frequency, making the programming workflow consistent. When replacing the Aftermarket 3-Button Remote Head Key (FCC ID LXPT003), confirm that the HU100 keyway matches the vehicle’s ignition cylinder before beginning any cloning or on-board programming procedure.
Technical Specifications of the Aftermarket 3-Button Remote Head Key (FCC ID LXPT003)
This remote head key integrates a mechanical blade and an electronic remote module into a single housing, eliminating the need to carry a separate key fob. The integrated blade uses the HU100 keyway profile, a high-security sidewinder cut pattern that requires specialized key-cutting equipment. Locksmiths will need either a code cutter with the correct HU100 jaw or a manual duplicator equipped with the right tracer and cutter for sidewinder profiles.
The transponder embedded in this unit is the PCF7937E. This chip communicates with the vehicle’s immobilizer module during ignition, and the engine will not start until the immobilizer authenticates the transponder’s cryptographic response. Programming the PCF7937E into a supported vehicle typically requires a professional-grade diagnostic tool or dedicated automotive key programmer capable of interfacing with the target vehicle’s body control module (BCM).
On the remote side, the key transmits at 315 MHz under FCC ID LXPT003. The three buttons control door lock, door unlock, and trunk or rear hatch release. Remote pairing is handled through either an on-board programming sequence or through a diagnostic tool, depending on the model year and the number of existing keys available. In some scenarios, if all original keys have been lost, a locksmith must first establish a new immobilizer key set via the BCM before the remote can be learned.
Vehicle Compatibility
The following Chevrolet models accept this remote head key based on validated fitment data:
- Chevrolet Cruze (2016–2019) — The second-generation Cruze uses the HU100 ignition profile and supports 315 MHz remote operation. This key is a direct functional replacement for the OEM unit in these model years.
- Chevrolet Sonic (2012–2020) — Across its full production run, the Sonic is compatible with the LXPT003 remote head key. Blade cuts should be sourced from the vehicle’s key code or duplicated from a working original.
- Chevrolet Spark (2015–2022) — The subcompact Spark shares the same ignition and immobilizer platform, making this fob a practical and affordable replacement for owners and fleet managers alike.
- Chevrolet Trax (2013–2026) — The first-generation Trax, spanning nearly a decade of production, uses the same remote head key configuration. Technicians should verify the VIN against available key code databases before cutting.
Because all four models share the HU100 keyway, PCF7937E transponder, and 315 MHz remote frequency, a locksmith stocking this single aftermarket SKU can service a broad cross-section of Chevrolet vehicles encountered in the field.
Programming Considerations for Locksmiths
Programming the Aftermarket 3-Button Remote Head Key (FCC ID LXPT003) involves two distinct steps: immobilizer transponder registration and remote control pairing. These steps may be completed sequentially or simultaneously depending on the programming platform in use.
For transponder registration, the PCF7937E must be written to and then learned by the vehicle’s immobilizer system. Most professional automotive key programmers support this chip through their Chevrolet/GM vehicle coverage menus. The technician connects to the OBD-II port, navigates to the immobilizer module, and follows the guided procedure to add a new transponder. PIN or security code access may be required, which can often be retrieved by VIN through authorized data sources.
Remote pairing for the 315 MHz module can sometimes be accomplished through an on-board programming sequence when at least one working key is already present. The typical procedure involves cycling the ignition with an existing registered key and then pressing a button on the new remote within a timed window. If no working keys exist — an all-keys-lost scenario — the remote must be paired through the diagnostic tool during the same session in which the transponder is registered. Combining both steps reduces total labor time and ensures the key is fully functional before handing it to the vehicle owner.
Blade Cutting and Mechanical Fit
The HU100 blade profile is a two-track internal-cut (sidewinder) design. Precision matters significantly with this keyway — even minor depth deviations can prevent smooth insertion or cause the wafer tumblers to bind. Locksmiths should use carbide cutters rated for high-security blanks and verify cuts against a known working key or a decoded set of bitting values.
When originating a key by code (no working key to duplicate), the bitting can be pulled from the vehicle’s door lock or ignition cylinder using an HU100 Lishi pick-decoder tool. Alternatively, if the key code is available from the dealer or a code retrieval service, the cuts can be made directly on a code machine. After cutting, test the blade mechanically in the ignition before proceeding to electronic programming — this avoids wasting time on transponder enrollment only to discover the blade does not turn.
OEM vs. Aftermarket: Practical Differences
From a functional standpoint, the aftermarket unit covered here performs identically to the OEM key once properly cut and programmed. The housing material and button feel may differ slightly — aftermarket shells tend to use a marginally different plastic compound — but the electronic internals (the PCF7937E chip and the 315 MHz transmitter board) deliver the same signal characteristics. Range performance under normal conditions is comparable, though aftermarket units should be tested at the vehicle to confirm adequate signal strength before the customer departs.
The cost differential is where this key shines. Dealership replacement for these Chevrolet models often runs several times the price of an aftermarket unit plus locksmith labor. Vehicle owners seeking a spare key or replacing a damaged original will find the aftermarket route significantly more economical, particularly when a mobile locksmith can cut and program the key on-site.
When to Call a Locksmith
Vehicle owners who need this remote head key replaced or duplicated should contact an automotive locksmith rather than defaulting to a dealership visit. A qualified locksmith equipped with an HU100 cutter and a compatible key programmer can complete the entire job — blade cutting, transponder registration, and remote pairing — at the vehicle’s location. This eliminates towing costs and dealer scheduling delays. When calling, owners should have the vehicle’s VIN ready so the locksmith can confirm fitment and pull key code data in advance.
Specifications and fitment
| Key type | Remote Key |
|---|---|
| Transponder chip | PCF7937E |
| Button count | 3 |
| Frequency (MHz) | 315 |
| Keyway | HU100 |
| FCC ID(s) | LXPT003 |
| Region(s) | USA |
| Product type | Remote Head |
| Compatible makes | Chevrolet |
Listed vehicle fitment
| Make | Model | Years |
|---|---|---|
| Chevrolet | Cruze | 2016–2019 |
| Chevrolet | Sonic | 2012–2020 |
| Chevrolet | Spark | 2015–2022 |
| Chevrolet | Trax | 2013–2026 |
Fitment must be confirmed against the existing key’s FCC ID family and the vehicle’s exact configuration before cutting or programming. VIN or photo verification may be required.
Questions and answers
Which vehicles does Aftermarket 3-Button Remote Head Key (FCC ID LXPT003) fit?
Aftermarket 3-Button Remote Head Key (FCC ID LXPT003) is listed to fit Chevrolet applications such as Chevrolet Cruze, Chevrolet Sonic, Chevrolet Spark, Chevrolet Trax. Confirm the exact year range and the existing key’s FCC ID family before ordering, since fitment can vary by trim and region.
Does Aftermarket 3-Button Remote Head Key (FCC ID LXPT003) need programming?
Yes. Because it carries a transponder/remote function (chip PCF7937E), it must be programmed (paired) to the vehicle’s immobilizer and, for remote functions, to the keyless-entry system. Many vehicles also require at least one working key to add a new one.
Does the blade need to be cut?
Most Aftermarket 3-Button Remote Head Key (FCC ID LXPT003) units ship uncut and require automotive key cutting before they will turn the ignition or door lock. Cutting establishes the mechanical match; programming establishes the electronic match — both are needed.
Is Aftermarket 3-Button Remote Head Key (FCC ID LXPT003) OEM or aftermarket?
This listing is an aftermarket-grade replacement intended to match the original key’s electronic and mechanical specification. It is not required to carry a vehicle-brand logo and should be matched by FCC ID family and chip type rather than by appearance.
Check Fitment and Key Help
Low Rate Locksmith, a mobile automotive locksmith, can confirm whether Aftermarket 3-Button Remote Head Key (FCC ID LXPT003) matches an existing FCC ID family and coordinate cutting and programming when the vehicle configuration requires professional service. For dispatch and support, call (833) 439-8636 or email info@lowratelocksmith.com.
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