2007 Cadillac STS
Key Replacement - Save vs Dealer in San Diego

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

I got a call from a guy out near Peutz Valley in Alpine. He was parked at the Elks lodge and he was done. Not frustrated-done. Resigned-done. The kind of quiet where someone has already spent money and gotten nothing for it.

He'd paid another locksmith earlier that week to program a replacement smart key for his 2007 Cadillac STS. The key turned over the engine fine. Then the car ran for about two seconds and died. Every single time. Same result. The first locksmith looked at it, said the body control module was probably bad, and left.

I asked him to crank it once so I could watch. Two seconds. Fuel cut. Classic incomplete immobilizer enrollment. The BCM was not the problem.

What happened is that GM's theft deterrent learn cycle on this generation has a timing component. If you rush it, lose power during the sequence, or skip the wipe of old key data before registering new keys, the system logs the key as temporary. It looks enrolled on the tool screen. It isn't. The module doesn't commit it permanently, and the security system kills the engine on startup every time.

I connected through the OBD port, cleared the failed key data from the system, and ran a clean all-keys-lost procedure from scratch with the full security timer allowed to complete. Confirmed the key was permanently stored before I disconnected anything. Then I started the car three times in a row, watching for fuel cutoff. Nothing. Clean starts, all three.

He had already paid the first locksmith. I couldn't undo that. But I could make sure the job was actually finished, and he drove home that afternoon.

The dealer comparison almost came up. He mentioned it. I told him my number was a fraction of what the dealer quoted him, and we moved on.

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