Driving in Snow, all Warning lights came on?? pulled over shut car off, then restarted same but no power to windows, lights, climate control, radio.
Starts fine, only flashers work - no brake or tail lights. Figured out how to get out of park, will not shift out of first gear, manual shift mode doesn't work either. googled and seen a lot of issue pointing to faulty grounds. Checked all chassis / frame grounds in engine bay, redid one, cleaned all of them. no change. removed battery and tray lifted fuse box, checked plugs, all good. NOTE: when you turn ignition to ACC before starting you can hear relays clicking in Engine bay, even in Fuse box. Checked all fuses and swapped relays around... no change.
Could it be PCM?
Thanks, Old Navy Guy Joe

 

Welcome to the forum. Next time you have vehicle questions, try posting them up in the appropriate vehicle section of the forum where your fellow Pacifica owners hang out. This is the new members section where people introduce themselves. A bad PCM will issue its own error codes. Before you spend money replacing the PCM, get a really good code reader hooked up and gather all the error codes that are in there. Sounds like you will find that the computers are not talking to each other. You have described problems with systems controlled by the body computer as well as the transmission computer. You will need to get a very sophisticated computer to drill down and find out what's lurking in there, but it could be some simple thing that's affecting computer communication. The code readers that auto parts stores use may not be smart enough to get down to where the problem is. A good repair shop or dealership should have a machine that is capable of doing so. Good luck.