Boy, you gotta love all the unnecessary, complicated, unreliable computers the insane engineers have put on cars today. Due to all the toys and gimmicks they've convinced us we want, computers are involved in almost every system. When they get confused, they lock up and usually the dealer has to use their equipment to unlock them. That insures you'll keep coming back to spend more money. GM is the best at getting your money after the sale.
If this happens again or multiple times, you might consider replacing the battery. Since the '87 models, GM has had by far the world's worst designed generator. They develop huge voltage spikes that can destroy the diodes and internal voltage regulator repeatedly, can interfere with sensor signals and cause running problems, and can cause computers to lock up. Part of the battery's job is to dampen and absorb those spikes to render them harmless. As a battery ages, it loses its ability to absorb those spikes. It may still work fine in an older pre-1987 car.
Saturday, August 13th, 2011 AT 8:39 PM