No spark

Hi, experts. I have a 2002 Dodge Caravan 3.3L. After I had put it in storage for a month, I couldn't start it but crank. Now I pulled it to a garage and got checked. First, no spark; then checked ignition coil was good, camshaft sensor was good, crankshaft sensor was good. So in the next step, we aimed to the PCM. OBDII code was P0601, but check engine light wasn't on. I have read a lot of threads about P0601. It looks like in most of the cases, drivers even don't notice the existance of the P0601. Is my car's problem related to this code? Is the problem related to the PCM? Is there any other possibilities other than PCM failure? I badly need help. I have heard I can plug in another same model's PCM to get it checked, is it true? Any suggestions? Thank you ahead.
From Kevin