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at your dash to see if the check engine light is lighting up when you
turn the ignition on, before cranking. If it's not lighting up, your ecu
might need to be repaired. Also, try leaving the ignition on for a
while, about 30 minutes, to see if your check engine light does finally
come on. The jeep should start if that light comes on. Could also be your crank sensor is bad.
If no spark and you also do not hear the fuel pump prime when you turn on the ignition, then the ecu has probably gone bad and needs repair. Does your check engine light come on the dash, when you turn the ignition to on, before cranking? If not, the ecu will need to be repaired or replaced. If your check engine light comes on, then maybe it's the crank sensor that's bad.
Might be your jeep's ecu is bad. Does the check engine light come on your dash, when you turn the ignition key to on, before cranking? If not, the ecu is bad. If the check engine light does come on, it may be the crank sensor is bad on your jeep.
Might be the main part, your ecu, which is bad. Does the check engine light show up on the dash when you turn the key to on, before cranking the engine? If no check engine light on the dash, then it's the ecu that's in need of repair.
Make sure that when you turn the ignition key on that you see the check engine light does light up on the dash, before you try cranking the engine. If no check engine light is on, the jeep won't start. If the check engine light is on and it still won't start then it could be your crank sensor, fuel pump or a host of other problems not allowing it to start.
the battery says 12 volts but may be dropping to 4 or 5 under a load...i would suggest jumpstarting the car and see what happens.the battery should read in the high 12 volts and not less than 9.5 under cranking. the dash lights go out on your car when starting,and the alarm will go off ,and disable the ignition if the voltage is too low in cranking the car because the computer will shut it down and activate the anti theft.....check your battery posts are tight. best of luck
check and recheck all conections on battery and starter and grounds on battery and the ground on engine bblock and body ground or grounds,if not sure make another one ,check connections at battery ,it does sound like a bad ground to body and eng just make ur owne and see what happens
most probable cause could be a faulty ignition switch. Does the lights on the dash come on when you turn the key to the on position ? Do they turn off when you turn the car to the start and are about to crank the engine ? If that does not happen you will have to replace the Ignition switch. They don't have a fuse for the dash lights.