Bosma 4-Button Remote Key Fob (FCC ID KOBGT04A) – Full Guide

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

Operating at 315 MHz with a four-button layout, the Bosma 4-Button Remote Key Fob (FCC ID KOBGT04A) serves as a keyless entry remote for a wide range of General Motors vehicles produced between 2004 and 2012. This unit is identifiable by its compact housing and quad-button face, which typically provides lock, unlock, trunk release, and panic functions. The Bosma 4-Button Remote Key Fob (FCC ID KOBGT04A) is manufactured by Bosma Enterprises as an aftermarket replacement for the OEM GM remote carrying the same FCC ID. Compatible vehicles span four GM brands — Buick, Chevrolet, Pontiac, and Saturn — all sharing a common 315 MHz receiver architecture. A correctly programmed Bosma 4-Button Remote Key Fob (FCC ID KOBGT04A) will communicate with the vehicle’s body control module to execute remote lock and unlock commands, open the trunk, and trigger the panic alarm from a reasonable operating distance.

Bosma 4-Button Remote Key Fob (FCC ID KOBGT04A) Vehicle Compatibility

The KOBGT04A FCC ID was used across a substantial portion of GM’s mid-2000s lineup. This remote fits multiple model years and nameplates, making it one of the more versatile aftermarket GM remotes available. Below is the full validated fitment list:

Buick

• Buick Allure — 2005 through 2010
• Buick LaCrosse — 2005 through 2009
• Buick Terraza — 2005 through 2007

Chevrolet

• Chevrolet Cobalt — 2005 through 2010
• Chevrolet HHR — 2006 through 2011
• Chevrolet Malibu — 2004 through 2007
• Chevrolet Malibu — 2008 through 2012
• Chevrolet Uplander — 2005 through 2009

Pontiac

• Pontiac G5 — 2005 through 2010
• Pontiac G6 — 2005 through 2010
• Pontiac Grand Prix — 2004 through 2008
• Pontiac Montana — 2005 through 2009
• Pontiac Solstice — 2006 through 2009

Saturn

• Saturn Aura — 2007 through 2009
• Saturn Relay — 2005 through 2007

Note that the Chevrolet Malibu appears with two distinct generation brackets. The 2004–2007 sixth-generation Malibu and the 2008–2012 seventh-generation Malibu both accept the KOBGT04A remote, though the two generations differ substantially in body style and interior electronics. This fob handles the keyless entry function across that generational divide.

Understanding the KOBGT04A FCC Designation

Every wireless device sold in the United States must carry an FCC ID that certifies its radio frequency emissions comply with federal regulations. The KOBGT04A designation identifies this particular remote’s 315 MHz transmitter characteristics, antenna design, and power output profile. When shopping for a replacement fob, matching the FCC ID is the most reliable way to ensure radio compatibility with the vehicle’s receiver module. While multiple aftermarket manufacturers produce remotes under this FCC ID, the Bosma version discussed here is produced by Bosma Enterprises and is commercially available as an aftermarket option.

It is important to distinguish this device from transponder-equipped key fobs. The KOBGT04A is a standalone remote — it controls keyless entry functions but is not an integrated key-and-remote unit. Vehicles in the fitment list above that use a transponder-based ignition key will require a separate physical key programmed to the immobilizer system. The remote and the ignition key are two independent devices on these GM platforms.

Button Functions and Physical Layout

The four buttons on this remote correspond to standard GM keyless entry operations. The lock button sends a signal to the body control module (BCM) to engage all door locks and, on most models, trigger a confirmation chirp or light flash. The unlock button disengages the locks — a single press typically unlocks the driver door, while a double press unlocks all doors, depending on how the BCM is configured. The trunk or hatch release button actuates the rear trunk latch solenoid or liftgate mechanism. The panic button activates the horn and lights in a pulsing pattern, useful for locating the vehicle in a parking lot or drawing attention in an emergency.

The remote housing is a self-contained plastic shell with a battery compartment accessible by separating the two halves of the case. Most units in this form factor use a standard CR2032 coin cell battery, though owners should verify the battery type printed inside the compartment before replacing it.

Programming Procedures for Locksmiths and Owners

GM vehicles from this era generally support an on-board programming procedure for keyless entry remotes, which does not require a scan tool. The typical sequence involves cycling the ignition and holding a combination of door lock switches to place the BCM into learn mode. Once the BCM enters learn mode, pressing the lock and unlock buttons on the fob simultaneously will pair it with the vehicle. The BCM confirms enrollment with a door lock cycle. Up to four remotes can usually be stored in the system — when a new remote is programmed, any previously paired remotes must be re-enrolled during the same session or they will be erased.

Automotive locksmiths working with diagnostic platforms such as Autel or Launch can also program the fob through the BCM module in the vehicle’s diagnostic menu. This approach is more reliable in cases where the on-board procedure fails due to a worn ignition switch or a BCM that has been reflashed with updated firmware that changes the learn-mode entry sequence.

Because this device is a remote-only unit without transponder functionality, programming it does not require access to the vehicle’s immobilizer or anti-theft system. The process is purely a BCM radio pairing operation, making it one of the simpler programming tasks in the automotive locksmith workflow.

OEM vs. Aftermarket Considerations

The original-equipment version of this remote was produced under GM’s parts catalog and carries GM branding on the housing. The Bosma aftermarket version replicates the same 315 MHz transmission protocol and FCC-certified circuit board design at a lower price point. For vehicle owners replacing a worn or lost fob, the aftermarket option provides the same lock, unlock, trunk, and panic functions without the dealership markup. The programming procedure is identical regardless of whether the remote is OEM or aftermarket, since both transmit on the same frequency and use the same rolling-code protocol recognized by the BCM.

One consideration when purchasing aftermarket remotes is build quality variation. Battery contacts, button membranes, and case snap-fit tolerances can differ between manufacturers. The Bosma unit is a commercially available option that meets FCC requirements for the KOBGT04A designation, but owners should inspect the fit and feel of the buttons upon receipt and verify that all four functions register correctly during the programming confirmation step.

When to Contact a Locksmith

While the on-board programming procedure for this remote is accessible to many vehicle owners, there are situations where professional locksmith assistance is warranted. If the vehicle has a malfunctioning BCM, a dead battery that has reset the module’s memory, or if the on-board learn-mode entry sequence does not activate as expected, a locksmith with GM diagnostic capability can troubleshoot the issue efficiently. Additionally, if the vehicle owner needs both a new ignition key and a replacement remote, a locksmith can handle the transponder key cutting and programming alongside the remote pairing in a single service call — saving a separate trip to the dealership.

Related help: Buick auto locksmith, Chevrolet auto locksmith, Pontiac auto locksmith, Saturn auto locksmith, car key replacement, car key programming.

Compatible and related keys: Strattec Transponder Key (chip ID46) (compatible fob), Aftermarket Remote Head Key, Lear 4-Button Remote Key Fob (FCC ID KOBLEAR1XT), related key: Aftermarket Remote Key Fob (FCC ID AB01502T), Bosma Remote Key Fob (FCC ID KOBUT1BT), related key: GM Mechanical Key Blank (GM39), Strattec Mechanical Key Blank (B102), Continental Automotive Smart Key Fob (FCC ID NBGGD9C04) (compatible fob), Bosma Flip Key, Strattec Smart Key Fob (FCC ID HYQ4AA).