Dead Lesabre

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.

That rules out the battery. I mentioned that because GM generators are such a common cause of computers locking up or doing wrong things. I can think of other causes but you would have had more problems long before now.

You also must keep in mind what the dealer did and what they told you they did could be two different things. Disconnecting a battery cable for a minute was a popular "fix" to "reset" computers, but since the early 2000s, a lot more trouble can be caused by doing that. Volkswagen is the worst for that but GM isn't far behind. Disconnecting the battery can leave multiple computers shut down until they are unlocked by the dealer. I'm suspicious the dealer installed new software into the Body Computer or they unlocked it and didn't tell you.

Guess we'll have to see what happens in the future.

You're definitely talking with the wrong guy now. I personally hate the General Motors company so much I could spit. People fall for their splashy advertising, then get stuck with huge repair bills later. GM has devised a whole bunch of ways to separate you from your money after the sale including those computers that can only be worked on by the dealer. They only allow independent repair shops to work on three computers, as mandated by the government, because they have an affect on emissions. I've written five-page articles on all of the business practices GM has that hurt their customers. The only companies I know of that are worse are Volkswagen and BMW. Once you buy their product, they know they have you hooked for at least a few years and they can charge whatever they want to for parts and services that you can't get anywhere but the dealer.

If you want to deal with a customer friendly manufacturer, look at Hyundai, Chrysler, or Toyota. Chrysler and Toyota allow any independent shop to access their repair information web site and to download any computer software except for the Security System which must go back to the dealer so they can prove the car isn't stolen. There's a very small fee for that service. Only Hyundai allows full access to their web site for anyone at no cost. Hyundai's sales are going way up and GM can't find any repeat customers. Wonder why.