2003 Chevrolet Venture
Key Replacement - Save vs Dealer in Ventura County

2003 Chevrolet Venture Transponder Key Replacement - Fast, Affordable & Professional

Got a call from a guy out near Bard Reservoir in Thousand Oaks. He had a 2003 Chevrolet Venture that cranked, fired for about two seconds, then died. "Service Theft Deterrent" lit up on the cluster every time. He'd already been through it with another locksmith who sold him a new "transponder key" and charged him for programming. The key turned the ignition fine, but the van still wouldn't stay running.

Here's the thing. The 2003 Venture doesn't use a transponder chip in the key at all. It runs Passlock II, which means the security handshake happens between the ignition lock cylinder's internal sensor and the BCM, body control module. The previous guy basically cut a key and charged for programming that doesn't exist on this platform.

I pulled up to him in the parking area, connected my Smart Pro to the OBD-II port, and ran a Passlock relearn through the BCM. The procedure takes about 30 minutes because you have to cycle through three 10-minute security timers back to back. No way around it. GM built that wait into the system.

After the third cycle, the van fired and held idle. Security light went off. He sat in the driver's seat for a minute just letting it run, like he was waiting for it to stall again.

It didn't. He paid what I quoted on the phone and drove home.

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