Keyecu Cadillac CTS STS Replacement 5-Button Smart Remote Key Fob (2008-2013) — Transponder-Ready, OEM-Style

If your original Cadillac smart key is lost, damaged or worn out, this Keyecu replacement offers the same button layout and FCC ID compatibility (M3N5WY7777A) as many factory remotes. It ships as a complete shell with the correct electric contacts and a transponder-ready key blank, but it requires professional key cutting and electronic programming at a dealer or a qualified locksmith before it will operate with your vehicle. Confirm the metal key blade shape matches your current key before ordering to ensure proper fit.

How do I know this remote fits my Cadillac?

This remote is specified for Cadillac CTS and STS model years 2008 through 2013 and lists the matching OE numbers (25943676, 25943677) and FCC ID for easier cross-referencing. Compare your existing key’s blade profile and part numbers with the product details to avoid mismatches.

• Compatible vehicles: Cadillac CTS 2008–2013, Cadillac STS 2008–2013
• Reference numbers: FCC ID M3N5WY7777A; OE #s 25943676, 25943677
• Check: confirm key insert blade style matches exactly before purchase

What steps are required to make the remote work with my car?

The Keyecu remote ships with the electronic housing and a transponder-ready key blank, but it is not turn-key. You must have the metal blade cut to your vehicle’s key code and have the remote and transponder chip programmed to your car’s immobilizer by a dealer or an experienced automotive locksmith.

• Get the key blade cut to your VIN or original key profile at a locksmith/dealer
• Have the transponder chip and remote frequencies professionally programmed
• Test all five buttons (Lock, Unlock, Panic, Trunk, Remote-Start) after programming

What functions and hardware does the Keyecu fob include?

The fob contains five tactile buttons that replicate factory convenience features: lock, unlock, panic, trunk release and remote-start (if your vehicle supports remote-start). The housing includes the button pads and contacts; a transponder chip must be programmed and the supplied key blank cut before use.

• Five buttons: Lock / Unlock / Panic / Trunk / Remote-Start
• Includes transponder-ready key blank (not yet cut or programmed)
• Housing and internal contacts designed to match original OEM layout

Will this replacement save me time and money versus a dealer key?

Buying an aftermarket Keyecu shell typically costs less than an OEM remote fob while providing equivalent button arrangement and FCC compatibility. However, factor in the additional expense of key cutting and programming—costs vary by locksmith and dealer—so compare local quotes before deciding.

• Lower part cost compared with many dealer-sourced remotes
• Requires paid key cutting and professional programming services
• Good option when original housing is broken but electronics are needed

Who this is for: drivers of Cadillac CTS or STS models from 2008–2013 who need a complete replacement remote shell and key blank rather than a pre-programmed remote. It’s ideal if you want an OEM-like button layout at a reduced parts price and are able to access a locksmith or dealer for key cutting and immobilizer programming. Avoid this product if you need a ready-to-use, pre-programmed fob—this unit requires professional finishing steps to function with your vehicle.