- 99% of the problem is the battery. 1% can be starter/spark plug. ) ~7 F4 P! D" W8 p- 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. / G7 l/ v& w1 ^- ^0 Y- make sure there's gas left in the tank 2 G& {- ^4 |0 Y' L6 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.