Our 2012 Volt started having some computer errors while driving 5 hours south of our home. The display seemed to be intermittently showing errors and then the car would not start. A number of tries later and after a Sunday call to OnStar it did finally start (not sure why). However, it showed a continuous "Propulsion power is reduced" error, as well as a check engine light. The OnStar technician advised that we drive the car back to the dealer, but not turn it off again as it might not start up. On the drive, the car seemed a bit sluggish, but it did make it 300 miles back to the dealer. The service department has had the car all day, but with no report on prognosis. Wondering if anyone else has had this issue?