2007 Cadillac STS
Key Replacement - Save vs Dealer in Ventura County

2007 Cadillac STS Smart Key Replacement - Fast, Affordable & Professional

Got a call from a woman at the tailor shop off Madera Road in the Oak Park area of Simi Valley. Her 2007 STS had been acting up for about a week. Some mornings the push-to-start worked fine. By afternoon, the DIC would flash "No Remote Detected" and the engine would crank for two seconds, then cut fuel.

She had already been to another locksmith. They programmed a fob, charged her, and it worked at first.

I pulled her fob apart on my truck tailgate and ran it through my VVDI2. The chip inside was wrong. It was close enough to pass the Theft Deterrent Control Module's initial handshake, but the Passkey 3+ system runs a deeper revalidation over multiple drive cycles. A near-match will clear the first check and then start failing intermittently on the second or third. That is exactly the pattern she described.

Programmed a new M3N-65981403 with the correct PK3+ chip, seated a fresh CR2032, and registered it to her BCM through the OBD-II port. Then the real test: lock, unlock, remote start, push-to-start, walk-away lock. Ran it all twice. She stood there watching the dash the whole time, waiting for it to act up again.

It didn't. Months later, still working. The difference between a key that starts and a key that keeps starting comes down to the chip generation inside the fob.

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