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.
Car Problem Reports
Chrysler PT Cruiser Locked up WCM may cause engine cranking problems
Chrysler PT Cruiser Problem
Average Mileage: 38,046 mi (35,139 mi - 43,000 mi)
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