If the engine does not crank (or cranks but won't start), the wireless control module (WCM) may have locked up. This is due to static discharge through the ignition key. A revised model should be installed, but simply disconnecting the negative terminal of the battery for thirty seconds will temporarily reset the module so you can start the car.Google+
Car Problem Reports
Chrysler PT Cruiser Locked up WCM may cause engine cranking problems
Chrysler PT Cruiser Problem
Average Mileage: 47,909 mi (35,139 mi - 77,500 mi)
Visitor, 2008 Chrysler PT Cruiser, 77,500 mi
took it to Kahlo Jeep in Noblesville and they charged me $450 to fix and they said they replaced WCM but as soon as I got it home next morning did same thing. they towed it back in and sat in shop and they said they tried it every day and no problem so I picked it up and the next morning did the very same thing. Again they towed it in and again they couldn't get it to fail so I took it home again and next morning it did very same thing. I asked for a refund and service manager said I should call the next day and she would look into. I called the number she gave but no answer but I left message. She never returned my call nor would they come and get it again when I called. Very disappointed by their service and their treatment of customers. I will not recommend them to anyone except people I dislike.
Visitor, 2008 Chrysler PT Cruiser, 35,139 mi
It just started about three weeks ago. I haven't felt safe driving it, it will crank after you turn it off after trying to crank it several times. I thought it was the battery but it wasn't. I'm going to have it looked at tomorrow.
Visitor, 2009 Chrysler PT Cruiser, 36,000 mi
HAd to take it in to get the security replaced