Car Alarms: remote start

Question
I have a 2007 Chrysler Sebring.  My problem is when I use I remote start the car does start, then turns off within 30 seconds.  It has always worked in the past.  I have made sure all windows, trunk, doors, sunroof and hood are closed. I tried pressing the trunk and the lock button together.  Any suggestions?

Answer
check the hood and tach wires, under the engine compartment, maybe one is unplug
also try to reprogram the tach wire, you have to find the instruction for your system brand and model
most DEI systems you start the car with the key and hold the valet switch for 5 seconds
the other problem can be that you just copy a new key to the vehicle and it erase the last one

good luck