Error Sync RunT

Hello All.
Today I had the first start up, after I replaced my M4 with a new M400, but I got this error ( many times, after I resetted errors, it came out again, maybe at idle ) I never had before...
What is it? Any advice?
Thanks in advance.
Today I had the first start up, after I replaced my M4 with a new M400, but I got this error ( many times, after I resetted errors, it came out again, maybe at idle ) I never had before...
What is it? Any advice?
Thanks in advance.