Strattec Smart Key Fob (FCC ID HYQ1EA) – PCF7937E 315 MHz Key
Fitments for the Strattec Smart Key Fob (FCC ID HYQ1EA) span several popular GM full-size trucks and SUVs, including the Chevrolet Silverado (2019), Chevrolet Suburban (2015–2020), Chevrolet Tahoe (2015–2020), GMC Acadia (2017–2023), and GMC Sierra (2019). Across these platforms, the fob handles passive entry and push-to-start ignition over a 315 MHz radio link paired with a Philips PCF7937E immobilizer transponder. Each Strattec Smart Key Fob (FCC ID HYQ1EA) communicates with the vehicle’s body control module during a cryptographic handshake that authorizes engine start. Owners replacing the device should expect a professional programming procedure that registers the new transponder to the vehicle’s anti-theft system. When ordering a Strattec Smart Key Fob (FCC ID HYQ1EA), confirm the FCC ID printed on the back of the unit matches HYQ1EA to ensure radio and immobilizer compatibility with the target vehicle.
Technical Specifications of the Strattec Smart Key Fob (FCC ID HYQ1EA)
The core of this smart key is its Philips PCF7937E transponder chip, a crypto-capable integrated circuit widely used in General Motors passive entry systems from the mid-2010s onward. The PCF7937E supports AES-128 encryption, which means every start cycle involves a challenge-response exchange between the fob and the vehicle’s immobilizer module. Unlike older fixed-code transponders, the device generates a unique rolling cryptographic response each time, making cloning attempts impractical without OEM-level tooling.
Radio communication operates at 315 MHz, the standard frequency for North American keyless entry systems. This frequency handles two distinct functions: the passive entry request that unlocks the doors when the driver approaches while carrying the fob, and the remote keyless entry commands triggered by button presses. The 315 MHz signal is separate from the low-frequency 125 kHz immobilizer interrogation that occurs when the key is inside the vehicle cabin near the steering column or start button antenna ring.
Strattec Security Corporation manufactures this unit as an OEM-tier supplier. Parts bearing the Strattec name are produced to the same specifications as dealer-sourced smart keys, which makes the fob a direct-fit replacement without aftermarket conversion concerns. The FCC ID HYQ1EA is registered with the Federal Communications Commission and confirms the unit’s RF output complies with Part 15 regulations for low-power transmitters.
Vehicle Compatibility and Fitment Details
The validated fitment list for this smart key covers a focused group of GM trucks and SUVs built on two related architectures. The Chevrolet Suburban (2015–2020) and Chevrolet Tahoe (2015–2020) share the K2XX full-size SUV platform, while the 2019 Chevrolet Silverado and 2019 GMC Sierra ride on the T1XX truck platform that debuted for that model year. The GMC Acadia (2017–2023) sits on the C1XX midsize crossover architecture but shares the same passive entry electronics module family, which is why the same FCC ID and transponder chip serve across these otherwise different vehicle lines.
Locksmiths should note that GM’s passive entry ecosystem across these years uses the same on-board programming protocol accessed through the OBD-II port. Diagnostic platforms from major tool manufacturers support key registration for these vehicles, though the specific software subscription tier required varies by tool brand. The vehicle’s body control module must be placed into learn mode, after which it polls for the new fob’s transponder presence. Once the PCF7937E completes its handshake, the BCM stores the key’s encrypted ID in non-volatile memory.
For vehicle owners, the most important compatibility check before purchasing is matching both the FCC ID and the transponder type. A fob with the correct exterior shell but a different internal chip will physically fit but fail to start the engine. The HYQ1EA designation confirms the radio hardware, while the PCF7937E confirms the immobilizer pairing. Both must match the vehicle’s requirements.
Programming and Registration Process
Adding or replacing this smart key requires access to professional-grade diagnostic equipment. GM’s passive entry system does not support owner-level “self-programming” sequences for smart keys the way some older turn-key systems allowed. A qualified automotive locksmith or dealership technician connects a scan tool to the vehicle’s OBD-II port, navigates to the immobilizer or key management module, and initiates a key learn procedure.
During registration, the scan tool instructs the body control module to open a learning window. The technician places the new fob near the designated antenna—typically embedded in the steering column shroud or center console—and the BCM sends a low-frequency interrogation signal. The PCF7937E transponder responds with its unique identifier and begins the AES-128 handshake. Once authenticated, the BCM writes the new key’s credentials to its approved key table. The vehicle may require all previously programmed keys to be re-registered in the same session, depending on the model year and BCM software version, so locksmiths should advise customers to bring every working key to the appointment.
After the transponder is registered, the remote keyless entry functions are typically learned in a separate step within the same programming session. The scan tool or a manual button-press sequence on the fob syncs the 315 MHz RF commands for lock, unlock, and any additional button functions. Once both the immobilizer and RKE are paired, the smart key is fully operational.
OEM vs. Aftermarket Considerations
Because Strattec Security Corporation is a Tier 1 OEM supplier to General Motors, parts carrying the Strattec name are functionally identical to keys sold at GM dealerships under the Chevrolet or GMC brand packaging. The internal circuit board, transponder chip, and RF module are the same; only the exterior branding may differ. This makes the fob an appealing option for locksmiths who want OEM-quality internals without routing the order through a dealer parts counter.
Aftermarket alternatives with the HYQ1EA FCC ID do exist from third-party manufacturers. These units may use compatible transponder chips but can vary in build quality—particularly in the shell durability, battery contact reliability, and button membrane longevity. Professional locksmiths who stock this Strattec unit often cite fewer warranty callbacks compared to generic aftermarket equivalents, which reduces repeat service visits and supports customer satisfaction.
Battery and Maintenance
Like most modern smart keys, this fob uses a coin-cell battery to power its 315 MHz transmitter and onboard electronics. When battery voltage drops below a threshold, the vehicle’s instrument cluster typically displays a “Key Fob Battery Low” message. Replacing the battery does not erase the programmed transponder credentials—the PCF7937E’s cryptographic keys are stored in non-volatile memory and persist through power loss. Owners can replace the battery themselves by separating the fob’s two shell halves with a small flat tool and swapping the coin cell, which is a straightforward maintenance task that does not require a locksmith visit.
If the fob battery is completely dead, the vehicle can still be started by holding the smart key against the start button or designated backup antenna location. The engine’s starter antenna provides enough inductive energy to power the PCF7937E transponder passively, allowing the immobilizer handshake to complete without any battery assistance. This emergency start feature is a standard part of GM’s passive entry architecture and works with every fob registered to the vehicle.
Specifications and fitment
| Key type | Smart Key |
|---|---|
| Transponder chip | PCF7937E |
| Chip manufacturer | Philips |
| Frequency (MHz) | 315 |
| FCC ID(s) | HYQ1EA |
| Region(s) | AUO, USA |
| Product type | Smart Key |
| Compatible makes | Chevrolet, GMC |
Listed vehicle fitment
| Make | Model | Years |
|---|---|---|
| Chevrolet | Silverado | 2019– |
| Chevrolet | Suburban | 2015–2020 |
| Chevrolet | Tahoe | 2015–2020 |
| GMC | Acadia | 2017–2023 |
| GMC | Sierra | 2019– |
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 Strattec Smart Key Fob (FCC ID HYQ1EA) fit?
Strattec Smart Key Fob (FCC ID HYQ1EA) is listed to fit Chevrolet, GMC applications such as Chevrolet Silverado, Chevrolet Suburban, Chevrolet Tahoe, GMC Acadia. Confirm the exact year range and the existing key’s FCC ID family before ordering, since fitment can vary by trim and region.
Does Strattec Smart Key Fob (FCC ID HYQ1EA) 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?
A push-to-start smart key has no traditional blade to cut in normal use, though many include an emergency insert key that can be cut separately.
Is Strattec Smart Key Fob (FCC ID HYQ1EA) 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 Strattec Smart Key Fob (FCC ID HYQ1EA) 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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