2008 Buick Lucerne
Key Replacement - Save vs Dealer in San Diego

2008 Buick Lucerne Transponder Key Replacement - Fast, Affordable & Professional

I got a call from a dentist at his practice lot in Encinitas, over in Cardiff-by-the-Sea, on a Wednesday morning. Patients booked wall to wall, car sitting dead in the lot, and the dash was showing a key-not-detected warning with the security light on solid.

He had tried the key a handful of times already. That made it worse, because the immobilizer had gone into its lockout timer by the time I got there.

The car itself was fine. Engine, battery, all of it. The problem was the transponder chip in his key had lost its enrollment with the vehicle security system. Happens on these when a key gets exposed to a strong magnetic field, when a second key on the ring interferes repeatedly, or sometimes just age.

I waited out the remaining lockout window with him, then plugged into the OBD port and ran the theft-deterrent relearn through the body control module. The key came back online, the security light went dark, and the car started on the first crank.

He was back at his one o'clock patient on time. The dealer route would have meant an appointment, probably a tow since the car would not move, and sitting in their queue. What he paid me was a fraction of what that would have run, and he did not lose half a day.

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