Bosma Remote Key Fob (FCC ID KOBUT1BT) – Specs, Fitments & Programming

By Mohammad H. Abdelhadi, ALOA-Certified Master Locksmith, mobile automotive locksmith. Reviewed by Ray Obar, Master Locksmith. Updated June 1, 2026.

Sourcing decisions for the Bosma Remote Key Fob (FCC ID KOBUT1BT) split between OEM dealership channels and aftermarket suppliers — and for the GM platform vehicles this remote covers, the aftermarket path is well-established. An OEM unit from the original vehicle manufacturer typically costs significantly more, while aftermarket variants of this fob manufactured by Bosma Enterprises offer a cost-effective alternative operating at the same 315 MHz frequency. The Bosma Remote Key Fob (FCC ID KOBUT1BT) requires on-board programming through the vehicle’s body control module regardless of where it was purchased. For technicians stocking remotes for late-1990s and early-2000s GM trucks, SUVs, and sedans, this device covers an unusually broad range of platforms. When replacing the Bosma Remote Key Fob (FCC ID KOBUT1BT), confirm the vehicle’s model year falls within the validated fitment window before ordering.

Bosma Remote Key Fob (FCC ID KOBUT1BT) Technical Overview

This remote transmits at 315 MHz, which is the standard operating frequency for General Motors keyless entry systems of this era. The FCC ID KOBUT1BT is registered under Bosma Enterprises and has been a fixture in the aftermarket GM remote replacement market for years. Unlike proximity-based smart keys found on newer vehicles, this unit is a traditional remote — it handles lock, unlock, and other keyless entry functions but does not contain an immobilizer transponder integrated into the key head. The remote must be within RF range of the vehicle’s receiver module to trigger door lock actuators.

Because this is classified as a standalone remote rather than a remote head key or smart proximity fob, it pairs with a separate physical ignition key. Vehicle owners should note that the ignition key and the remote are independent components; programming one does not affect the other. If the ignition key also requires replacement, that is handled as a separate locksmith service involving key cutting and, on applicable model years, transponder cloning or programming.

Validated Vehicle Fitments

The Bosma Remote Key Fob (FCC ID KOBUT1BT) fits an extensive list of General Motors vehicles spanning Buick, Cadillac, and Chevrolet nameplates. Below is the full validated fitment list:

Buick

• Buick LeSabre — 1992 through 1999
• Buick Park Avenue — 1997 through 2005

Cadillac

• Cadillac DeVille — 1996 through 2005
• Cadillac Escalade — 2002 through 2006

Chevrolet

• Chevrolet Astro — 1995 through 2005
• Chevrolet Avalanche — 2002 through 2006
• Chevrolet Blazer — 1995 through 2005
• Chevrolet Impala — 2000 through 2005
• Chevrolet Malibu — 1997 through 2003
• Chevrolet Monte Carlo — 2000 through 2007
• Chevrolet S-10 — 1994 through 2004
• Chevrolet Silverado — 1999 through 2007
• Chevrolet Suburban — 2000 through 2006
• Chevrolet Tahoe — 2000 through 2006

This fitment range spans roughly fifteen years of GM production, covering everything from full-size luxury sedans like the Cadillac DeVille to heavy-duty trucks like the Chevrolet Silverado and full-size SUVs like the Tahoe and Suburban. The breadth of coverage makes the KOBUT1BT a high-volume SKU for locksmiths and automotive shops servicing older GM fleets.

Programming Procedures

Most GM vehicles in this era support an on-board programming sequence that does not require professional-grade diagnostic equipment. The typical procedure involves cycling the ignition between the “On” and “Off” positions in a specific pattern while the driver’s door is open, which places the body control module (BCM) into learn mode. Once the BCM enters learn mode — usually indicated by the door locks cycling — pressing a button on the remote within a set time window registers the device to the vehicle.

There are important caveats. Some model years and trim levels within the fitment list may require a slightly different sequence or impose a limit on how many remotes can be programmed simultaneously. When a new remote is taught to the BCM, previously programmed remotes may be erased from memory, meaning all remotes the owner wants to use must be programmed in the same session. Locksmiths performing this service should have all customer remotes in hand before initiating the learn procedure.

On certain Cadillac models, particularly the DeVille, the programming steps may involve the Driver Information Center (DIC) menu rather than the standard ignition-cycle method. Technicians should verify the correct procedure for the specific platform before beginning.

OEM vs. Aftermarket Considerations

The aftermarket remote bearing FCC ID KOBUT1BT from Bosma Enterprises is functionally identical to the OEM GM remote it replaces. Both transmit at 315 MHz and use the same rolling-code protocol recognized by the vehicle’s receiver. The primary differences between OEM and aftermarket units tend to be cosmetic — button feel, case material rigidity, and branding on the housing.

For vehicle owners, the cost difference is substantial. OEM remotes purchased through a GM dealership parts counter can run several times higher than an aftermarket equivalent. Given that these vehicles are now between roughly 18 and 32 years old, the aftermarket route is the practical choice for most owners. Dealership availability for OEM remotes covering models this old is also increasingly limited.

Locksmiths and automotive shops stocking this fob benefit from its wide cross-application. A single SKU covering fourteen distinct vehicle models across three brands reduces inventory complexity. The 315 MHz frequency and KOBUT1BT FCC registration are the key identifiers to verify when matching this remote to a customer’s vehicle.

Battery and Maintenance

Remote key fobs of this generation typically use a single CR2032 coin cell battery, though some variants may use a CR1620 or similar cell depending on the exact housing design. Battery life under normal use generally ranges from two to four years. Symptoms of a low battery include reduced operating range — needing to stand closer to the vehicle for the remote to function — and intermittent response from the door lock actuators.

Replacing the battery does not erase the programming. The remote retains its pairing with the vehicle’s BCM through non-volatile memory. However, if the battery is left dead for an extended period or the internal contacts corrode, reprogramming may become necessary. Owners should replace the battery promptly when range degradation becomes noticeable.

When to Contact a Locksmith

While on-board programming is accessible to many vehicle owners, several scenarios call for professional locksmith assistance. If the on-board programming sequence fails to initiate — the door locks do not cycle after the ignition procedure — the BCM may have a fault or the vehicle’s wiring to the receiver module may need diagnosis. A locksmith equipped with a GM-compatible scan tool can communicate directly with the BCM to force learn mode or troubleshoot receiver issues.

Additionally, if the vehicle owner has lost all existing remotes and needs a complete replacement set, a locksmith can program multiple units in a single visit while also verifying that the physical ignition key is in good working order. For older vehicles in this fitment range, worn ignition cylinders are common, and a locksmith can address both the remote and the mechanical key system in one service call.

Related help: Buick auto locksmith, Cadillac auto locksmith, Chevrolet auto locksmith, GMC auto locksmith, car key replacement, car key programming.

Compatible and related keys: compatible Lear 4-Button Remote Key Fob (FCC ID KOBLEAR1XT), compatible Strattec Mechanical Key Blank (B102), compatible Aftermarket Remote Key Fob (FCC ID AB01502T), GM Mechanical Key Blank (GM39), compatible Bosma Remote Key Fob (FCC ID OUC60270), Strattec Transponder Key (chip ID46), GM OEM 3-Button Remote Key Fob (FCC ID LHJ011) (compatible fob), Strattec Smart Key Fob (FCC ID HYQ1AA), related key: Strattec Smart Key Fob (FCC ID HYQ1EA), compatible Continental Automotive 4-Button Remote Key Fob (FCC ID M3N32337100).