Welcome, I'm Chris (aka Moose). Experts aren't employees / agents of Just Answer. We are independent service providers using the Site to sell their Expert knowledge to Customers. I strive to provide EXCELLENT 5 STAR service, let me know what's needed from me so your pleased.
The code you got will not prevent starting or running nor effect the lights. The wiring issue you found, PCM, will not effect the dash and parking lights. For the code, at the PCM check the red/white wire pin 55 from fuse 2 under the hood it should have battery voltage all the time. If it does and the connector and pin are clean then it does mean the PCM needs to be replaced, but again this will not harm anything leaving it alone. Also you have to program the PCM and keys to the vehicle during a PCM swap, its not plug and play.
For the lights, remove the headlight switch, while still plugged up, the headlights on, the dash alights and exterior parking lights not working are the light blue/red and light blue/black and brown wires powered?
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