Battery is fine. When I go to turn the key all lights come on and then it doesn't start. nothing. Not even a click. Hours later, it started fine! Took it to a mechanic anyway the next day and he said it was my ignition lock cylinder. So I replaced that. Ran great for a day, now it is doing the same thing again !! So obviously it was not that.
I had that problem with my 2002 Jeep Liberty and the ignition switch cracked so I had that replaced. I am not sure if that is included in the ignition lock cylinder ...
SOURCE: 89 Jeep Comanche Fuel Pump. Won't start after running great.
Replace the crankshaft position sensor
SOURCE: 2000 Jeep grand Cherokee will start then turn off
Replace the key Im the forman for a jeep dealership. The dealer should have told you that in the first place. there is no reason the key would unprogram itself unless the chip is intermitently shorting out. If you have another key start it if it stay running u know the key is at fault. hope this helps u out.
SOURCE: 2006 Jeep Wrangler won't start
First, make sure you can turn the engine by hand. If you can't then the starter can't turn it either. Have someone else turn the key and look for the source of the click...may be a relay. Go over the starting circuit with a volt meter. Check for power at the starter main terminal and then with the key turned to "start" check for power at the trigger terminal on the starter. Check battery voltage and check relay operation.
You have a neutral safety switch on the transmission if its an automatic and a clutch switch if it's a stick. Check them as well. Make sure battery grounding on fender and block are also clean and secure.
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SOURCE: Jeep liberty 2002.....ignition key lock
Most commonly it is the key is worn out. If you have a spare key or your current one is not too badly worn, have a copy of it made and try it in the switch. You will have to have the copy key "coded" so it will disable the anti-theft system in order for the engine to start. If the new key doesn't fix your problem, you will have to replace the tumbler assembly.
SOURCE: Key won't turn in 2002 Jeep Liberty, can't start.
put the key in the ignition and tap the key farther into the cylinder and turn. should work. seems like a chrysler problem! a handy tow truck driver showed me this solution last night. you can have the cylinder replaced if this keeps happening or just keep a handy-dandy whacking object in your center console for just such an occassion!
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