That could be possible also I received a bulletin about the heat degrading in stealth mode with my code. With this CEL only happening when it's cold @ 32 degress, with heat being used. So I'm leaning towards the
An updated thermostatic check valve has been that raises the thermostat’s opening temperature to 65° C which w released will resolve the condition."
I know this hasn't been done since my Karma was of a California origin, before it made it to the east coast. Also this is the first temp of probably 35 to 30 that the karma has been driven in.
I will be checking in with Lormax to see if he can fit me in next week.