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I’ve had a similar event as well.  It was about -21C, very early morning and the car was plugged in overnight and fully charged.  The ICE started and about 1km out, the same system error message occurred and the CEL was illuminated.  I ran on EV only mode for a short while intending to take it directly to the dealership then I decided to go to NORMAL mode.  The ICE started once again and this time started to “gallop” i.e. the ICE would  rev up then down repeatedly (cycle time about 2 seconds).  The car drove smoothly however.  Given this situation, I choose to drive to my office in EV mode (very close to the dealership) and wait for the service centre to open.  An hour later, I drove in with the same message with the ICE operating the same way (galloping).  When I arrived, the adviser took my information all the while insisting that they didn’t have time to handle this problem.  I simply said that the message indicated and advised service therefore they should keep the car until they could resolve the issue.  By the time the advisor completed the intake process and went to the car (it was parked in a warm drive bay),  the message had disappeared however the CEL was still illuminated.  They called me about 4 hours later saying they found a number of “cold weather” related faults but no other issues.  They uploaded new software into the battery control unit saying all was resolved.  The event has not repeated itself in the last 30 days.  Perhaps it was a software glitch that was resolved with the update.   The dealerships don’t seem to have a handle on this type of tech; years of ICE knowledge and weeks of EV knowledge.  It seems that this vehicle is a black box to these techs.  Has anyone else experienced the issue of the “galloping” engine?