I have a 2004 Jeep Liberty Limited, 3.7 L, that occasionally will not start while in park. There are no noises when I turn the key, but have full electrical power. When this happens, I will put it in neutral and it will start with no problems. Could it be a starter relay problem, or issues with my TRS? Please help! ??

SOURCE: My 2007 Jeep GC Laredo has failed to start 3 times

Seen this happen before, A guy had bought a brand new jeep cherokee, the second morning it would not even crank or turn the motor, he had a faulty key switch, could be your problem as well...

Testimonial: "We aren't sure (yet) what the problem is, but the ignition key is one of the possible causes. When the vehicle is in the shop...it doesn't fail."

SOURCE: wont start

There's only 2 more things that I can think of, check the fuse for the ignition, then the computor itself, you did everything else.It might be the problem and may not.

SOURCE: 2003 Chevy Impala starting issue

Sounds like the neutral safety switch is faulty. Slamming the shifter into Park has temporarily solved the condition for some, but the switch may have to be replaced.

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I don't have a solution, but have noticed that my 2006 Liberty will do this after it rains.

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!