My car would start up then power down. Therefore, I replaced the battery and it drove fine for two days then it rained and my car would not start it would just power down after 3 seconds. So over the course of three days I tried to start it the last day (today) I went to start my car and it started. I used a code reader and it gave me the code u1000. I'm not sure what is wrong with it. When I look it up it says it's could have something to do with the car not being grounded or a loose ground wire, or something being loose in general. Help please.