- 99% of the problem is the battery. 1% can be starter/spark plug. % O! n! o8 `' c4 {0 g2 E- if it's automatic transmission, check to see if the gear is set in park position. if it's in drive or reverse, you cannot start your vehicle. ) f9 Q2 G1 l4 m. C. J- make sure there's gas left in the tank / {$ {' E0 @$ i& Y9 ^. n/ m- depand on how old your car is, it may have a computer built in to control fuel injection. if the computer breaks, you won't be able to start the car either.