2009 Buick Lacrosse
Key Replacement - Save vs Dealer in Ventura County

2009 Buick Lacrosse Transponder Key Replacement - Fast, Affordable & Professional

Out in the Lang Ranch neighborhood in Thousand Oaks, an estate caretaker got stranded with a 2009 Buick LaCrosse at a ranch gate on a gravel access road. No dealer within reasonable distance, and even if there were, a flatbed would have scraped the undercarriage getting up that unpaved stretch.

He texted me a GPS pin. I loaded up everything for his LaCrosse and drove out.

First thing I did was connect to the OBD-II port and back up the BCM data with my ACDP programmer. On these GM W-body cars, if you disturb the immobilizer module without a backup, you can brick the Passlock learn and turn a simple key job into a much bigger headache. I've seen techs skip that step and regret it.

Cut the B111 blank to code, programmed the PK3 transponder through the diagnostic port, and ran the ten-minute security relearn the BCM demands before it'll accept a new key. The whole time we were just standing at a ranch gate watching hawks circle over dry grass.

His LaCrosse started on that gravel road. He sat there for a second with his hands on the wheel like he was making sure it was real.

A dealer would have meant a tow from a spot no truck wanted to go, plus days of waiting. He paid a fraction of what that route would have cost and never left the property.

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