Keyecu Replacement Smart Remote Key Fob for Cadillac CTS & STS — 5-Button (2008–2013), blank blade, requires cutting and programmi

This Keyecu 5-button smart remote key fob replaces the factory key for Cadillac CTS and STS models (2008–2013) but requires cutting and programming before use.

If your original Cadillac key fob is lost, damaged, or the battery door is broken, this aftermarket Keyecu smart remote offers the same button layout and FCC ID compatibility as many factory units. It is built to accept the correct transponder and provides Lock, Unlock, Panic, Trunk, and Remote-Start controls once properly cut and programmed by a dealer or qualified locksmith.

Will this remote fit my Cadillac model and year?

This Keyecu remote is designed for Cadillac CTS and STS vehicles from 2008 through 2013 that use the matching key blank and FCC ID. Verify the OE numbers and your key blade style to ensure a precise fit before ordering.

• Compatible models: Cadillac CTS 2008–2013, Cadillac STS 2008–2013
• Replace FCC ID: M3N5WY7777A
• OE reference numbers: 25943676, 25943677 for cross-checking
• Confirm your current key blank and insert blade match exactly

What functions and buttons does the key fob provide?

The Keyecu fob mirrors factory functionality with five clearly labeled buttons to operate vehicle access and remote start features. Buttons are positioned to match original feel and operation once the internal transponder is activated.

• Lock and Unlock: standard remote door access
• Panic: audible alarm to locate or deter
• Trunk: remote trunk release convenience
• Remote-Start: remote engine start (vehicle must support this feature)

Do I need to program or modify anything after purchase?

Yes—this is a replacement shell with the compatible electronics and transponder area, but it will not function until the transponder is programmed and the key blade is cut to your vehicle. Programming and key cutting must be performed by an authorized dealer or a trained automotive locksmith.

• Transponder chip requires vehicle-specific programming
• Key blank must be cut to match your ignition and door tumblers
• Dealer or locksmith service typically completes both steps
• Bring proof of ownership and vehicle details to speed service

How do I confirm the remote will work before I buy?

Check the FCC ID, OE numbers, and the physical shape of your key blade against the product listing images and part references. If your current fob or key blank differs, this remote may not be compatible.

• Match FCC ID: M3N5WY7777A on your original fob
• Compare OE numbers: 25943676 or 25943677 if available
• Inspect blade style—only purchase if it’s an exact match
• Contact a locksmith or dealer for compatibility confirmation

Who this is for: This Keyecu replacement smart remote is for Cadillac owners who need a cost-effective aftermarket key fob for CTS or STS models (2008–2013) that duplicates factory buttons and FCC compatibility. It’s ideal for drivers willing to have the transponder programmed and key blade cut by a dealer or qualified locksmith so the remote can function exactly like the original.