Help with my buick

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. So sorry to hear you're having trouble with your vehicle. It sounds like your LeSabre might have an issue with the ignition switch or a short somewhere in the electrical system. The fact that your car is acting like it's in accessory mode when you connect the battery could mean the ignition switch is stuck or malfunctioning. Also, if the car cranks but only fires up for a few seconds, it could be a fuel delivery issue, possibly related to a faulty fuel pump or relay. You may also want to check all the ground connections, as a loose or corroded ground can cause similar problems. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!