2007 Town and Country, about 190,000 miles.
While driving at steady highway speeds, I noticed the speedo going down toward zero. Then all the warning lights came on, and within a few seconds back off and the speedo went back to the correct reading. The engine ran smoothly. I saw no change in the voltmeter that is plugged into my lighter socket. Vehicle ran trouble-free the rest of the day.
Is this a warning sign of something that needs fix/replace? I like to do my own work and am seeking advice on what to do. I did unplug and plug back in the underhood fuse for the BCM, and saw no corrosion there.