Re: Smart Key not working
First things first ... check your tire pressures. You have one or more that is low on pressure. The TPMS indicator came on because of low pressure. After the tire(s) warmed up the pressure increased enough to reset the alarm.
As for the SmartKey, does the spare fob also not work correctly? Have you changed the battery in the fob? Most likely the battery in the fob is weak and needs to be replaced.