800 miles car bone stock. out for a drive today, warning light for tire pressure comes on, then a message in dash "tire pressure system failure". stopped, all tire pressures checked fine, started car back up, same message. after getting home, came out and fired her up, pulled into garage. Light not on anymore. Any ideas? Happen to anybody else? Just dont want to have dealer keep it for a few days to tell me nothing is wrong. Thanks guys