Quote Originally Posted by GMPX View Post
If the 2018 ECM is still using Service Number 55485591 then you have a reasonable chance of it working ok (assuming all the other modules on the 2018's will talk to the 2017 OS alright).
Where did you get that info? all the files i have indicate controller service numbers of "55591599", not "5545591", all the way back to the very first OS i have "55493455"
Does that indicate ive gone mad or was that a typo, or was i looking in the wrong place?