Skoda Scala Diesel Overvoltage Errors

Sounds familiar. I had similar electrical gremlins in my Scala. Lots of seemingly unrelated errors popping up. Did you check the alternator output? What voltage is the system running at when the engine is on?

I haven't checked the alternator output myself. Where did you measure the voltage? And was it also alternator failure in your case?

I measured at the battery terminals with a multimeter when the engine was running. Yes, it was indeed the alternator. The voltage regulator went bad, causing a power surge and triggering the overvoltage detection. I'd recommend getting it checked professionally.

Alternator failure it was. Voltage regulator seemed to have given up. Circuit protection did its job I guess, but not before frying some systems. Battery was also heavily discharged, presumably due to the faulty alternator. Repair cost 290€. Now all sorted.