My Fit started throwing a P0563 High System Voltage code today, the alarm went off overnight, and on shifts it starts blinking the Transmission Light and the Power Steering warning lights. Car drives normal overall no issues at all. But these codes are strange, has anyone seen this oddness before? I put in a new Honda battery a few months ago the correct one directly from the Honda dealer, that's the only somewhat recent change... otherwise bone stock. 40K miles.

 

I'm not a mechanic, but it sounds like a short or a bad ECM/PCM. Details here:

DTC Troubleshooting: P0563 (34-2) (5MT)

 

So I let the car dry out, there have been several rain events and everything went away no more issues. I am looking for loose cabling under the hood today. Thanks Bargain Guy for the Debug details.