Vauxhall Corsa warning about lack of power in very cold weather

Unfortunately there are many reasons why the reduced engine power light comes on and until it is scanned for fault codes to see what is triggering the light , impossible to offer any more insight to the cause

I had a 2017 Corsa. Had to change it. In the sub-zero temperatures we have been having, it drops into safe mode after a couple of miles. Park up at destination, leave it an hour and everything is ok again. A check on codes suggested the throttle position sensor was faulty, but car runs ok for several miles from starting.