The following URL, although a VW site, has a good explanation of what
OBD-II is, why it exists, and how it is used.
or if you want the official Dodge info, try http://tinyurl.com/a9qcr
Among its information is that PCM stands for Power Control Module. This
is the computer that monitors and controls the Powertrain.
Looking down the list, you will see:
P0602 Control Module Programming Error/Malfunction
This means that there is a problem with the computer. About the only
thing you can do yourself is disconnect a battery lead for 15 min, which
will reset it. If it comes back, you need professional help.
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