here a trick to see if the bypass is working or not. put your key in the the key cylinder but don't turn it and try to remote start the car. if it starts up than the bypass is having a problem or if it doesn't than the remote start is having a problem. i would check the transponder ring that goes around the key cylinder or see if the bypass is turning on with the remote start.

has your power died in your car anythime lately?

but i really want to say the unit is set to a voltage mode instead of tach. look under your hood see if there's a wire going to one of your injectors on your car if not than they set your car to voltage sense. usually when you set an remote start to voltage sense you'll have problems starting in the colder weathers so you'll have to set the crank time higher in the winter here sometimes but it should of been set to a tach mode. who installed your remote start for your?