- 99% of the problem is the battery. 1% can be starter/spark plug. ! ^# U2 B% L8 x' b5 Q- 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. : Q6 t) X+ | Y# K% ?- make sure there's gas left in the tank 4 G$ N/ \1 N1 G7 \- 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.