Strattec Smart Key Fob (FCC ID HYQ1AA) – Key Details & Fitments

Programming a Strattec Smart Key Fob (FCC ID HYQ1AA) requires a professional-grade diagnostic tool capable of interfacing with General Motors’ immobilizer architecture and completing a cryptographic handshake at 315 MHz. The procedure begins with ignition cycling and security relearn steps, followed by on-board enrollment of the Philips PCF7937E transponder embedded inside the fob. Locksmiths adding this unit to a vehicle must confirm that existing keys are registered before initiating the add-key routine, as the immobilizer module tracks the total number of enrolled devices. A Strattec Smart Key Fob (FCC ID HYQ1AA) that enrolls correctly will allow passive entry and push-button start without physical key insertion. Replacement units of this smart key generally ship unprogrammed and require on-site coding by a qualified technician or dealer service department. The Strattec Smart Key Fob (FCC ID HYQ1AA) remains one of the more commonly sourced aftermarket proximity keys for mid-2010s to early-2020s GM full-size trucks and SUVs.

Strattec Smart Key Fob (FCC ID HYQ1AA) Technical Specifications

At the core of this fob is the Philips PCF7937E transponder chip, a crypto-enabled device that communicates with the vehicle’s Body Control Module (BCM) and immobilizer system. The PCF7937E belongs to a family of automotive transponders designed for challenge-response authentication — the BCM sends an encrypted challenge, and the chip must return the correct calculated response before the engine start sequence proceeds. This layer of security means that a blank or improperly coded unit will not start the vehicle, even if the remote-frequency functions appear to work normally.

The fob operates on a 315 MHz radio frequency, which is the standard band for North American keyless-entry and proximity systems across the General Motors platform. This frequency handles the remote lock, unlock, and remote-start signals transmitted between the device and the vehicle’s receiver module. Because 315 MHz is shared across many GM products of this era, locksmiths should verify the FCC ID — HYQ1AA — stamped on the back of the unit to ensure correct part matching rather than relying solely on frequency compatibility.

Strattec Security Corporation manufactures the fob as an OEM-tier supplier. The company has long-standing contracts with General Motors for lock and key hardware, which means this product meets factory specifications for housing fit, circuit board layout, and transponder integration. Aftermarket clones exist at lower price points, but verifying Strattec branding on the shell and PCB is a straightforward way to confirm part authenticity during a service call.

Validated Vehicle Fitments

The following vehicles have been validated as compatible with this smart key:

• Chevrolet Suburban (2015–2020) — Full-size SUV platform; uses passive entry with push-button start on most trim levels during these model years.
• Chevrolet Tahoe (2015–2020) — Shares the GMT K2XX platform with the Suburban; identical immobilizer and BCM architecture, so the same fob part number and programming procedure apply.
• GMC Yukon (2015–2020) — The GMC counterpart to the Tahoe, running the same electronic platform and accepting the same proximity key hardware.
• GMC Terrain (2018–2024) — A compact crossover that transitioned to this fob format in its second generation; the programming routine is similar but the BCM software version differs from the full-size trucks.

On the full-size truck platform (Suburban, Tahoe, Yukon), model years 2015 through 2020 all share a common immobilizer generation, making part interchangeability straightforward across those nameplates. The GMC Terrain’s inclusion extends into 2024, reflecting a longer production run on its current-generation electronic architecture. Locksmiths should always confirm the model year against the vehicle’s VIN before ordering, since a 2021 Tahoe, for example, moved to the next-generation T1XX platform and uses a different FCC ID entirely.

Programming Considerations for Locksmiths

Enrollment of the Strattec Smart Key Fob (FCC ID HYQ1AA) on GM vehicles generally follows one of two paths: an add-key procedure when at least one working key is present, or a full key-replacement procedure when no working keys exist.

For the add-key scenario, the technician connects a diagnostic scan tool to the OBD-II port, accesses the BCM key-management module, and selects the “Add Key” function. The existing key must be placed inside the vehicle (usually on the steering column slot or center console pocket, depending on model) to authenticate the session before the new fob’s PCF7937E transponder is read and enrolled. The entire process typically completes in under five minutes per key.

When no working keys exist, the procedure requires additional security steps. The scan tool must perform a security bypass or seed-key exchange with the BCM, which can take anywhere from ten to thirty minutes depending on the tool manufacturer’s server response time. Some diagnostic platforms handle this via cloud-based token generation, meaning an active internet connection at the job site is necessary. Once the BCM is unlocked, each new fob is enrolled sequentially. Most GM vehicles of this generation support up to eight proximity keys per VIN.

After transponder enrollment, the remote-control functions — lock, unlock, and remote start — are typically learned automatically as part of the same diagnostic session. If remote functions do not sync during programming, a manual RF relearn can be triggered through a separate menu in the scan tool or by following the vehicle-specific button-press sequence outlined in the service manual.

OEM vs. Aftermarket Considerations

Because Strattec Security Corporation is the original equipment manufacturer for this fob, purchasing a Strattec-branded unit is functionally identical to buying the part through a General Motors dealership parts counter — the internal electronics, transponder chip, and housing are the same. The primary difference is packaging and pricing. Dealer-counter units carry a GM part number and GM branding on the box, while Strattec-branded units carry the Strattec part number.

Third-party aftermarket alternatives using the same HYQ1AA FCC ID are available from various suppliers. These fobs typically contain a compatible PCF7937E chip and 315 MHz transmitter, but housing quality and button-feel can vary. For price-sensitive vehicle owners, aftermarket options can reduce per-key cost substantially. However, locksmiths should test remote range and button responsiveness before leaving the job site, as lower-tier aftermarket shells occasionally exhibit reduced RF range or inconsistent button contact.

When to Contact a Locksmith

Vehicle owners needing a replacement for this smart key should contact an automotive locksmith who carries GM-compatible diagnostic equipment. Mobile locksmith services can program the fob on-site, eliminating the need for a dealership visit and the associated towing cost if no working keys are available. Requesting a Strattec-branded or OEM-equivalent unit ensures compatibility and avoids the trial-and-error risk sometimes associated with unknown aftermarket brands.

For owners of the Chevrolet Suburban, Chevrolet Tahoe, GMC Yukon, or GMC Terrain within the validated year ranges, this fob represents a direct-fit solution that restores full passive-entry and push-button-start functionality when properly programmed by a qualified technician.