Please let me know what P1684 and P1594 error codes on 2001 Chrys TC mean.

My speedometer points to the floor. Before that, the instruments were acting funny. I've seen posts on the solder joint issue on the back of the panel and will try that, but I'm wondering if the codes are saying somehting else is going on with the alternator, battery, or speed sensors.

thanks!

P1684 just means the battery was disconnected recently but P1594 means your charging system voltage is too high. Might have your alternator tested.