Hi Conny, welcome to the Volt forum. Switzerland is a beautiful place! Spent many months in Thun and Interlaken area! The SHVCS error is usually caused by the coolant level for HV battery being low, or a bad sensor ( its in the bottom of the reservoir). Also many have had the error show for no apparent reason, and consensus is that an air "burp" could momentarily uncover the sensor triggering the error. Of course in my own situation my Chevy dealer has a trained technician who can diagnose and reset these codes. How do you get factory service on a Chevy Volt in Switzerland?