Have you tried logging data to see what's actually going on?
https://www.audizine.com/forum/showt...1#post14214555

01207 - Control Module for Auxiliary Heater (J364)
004 - No Signal/Communication

Why do you have this error? Do you actually have aux heat?
Have you been playing with Carista? Another google hit on the subject mentioned some guy saying "oops, Carista turned that on incorrectly".