Ungwei
Seasoned Member
I guess that is possible. I did spend time when I initially picked it up messing with the infotainment with the car off, but after that, I drove it quite a few miles, and then just left it overnight. That morning when I turned it on, the check engine light came on, and I got the codes from Onstar. At this point I'm having my dealer call me and I'm gonna have them sort it out, I don't want to take any risks.Any chance your battery was low? I know the code says transmission but given that it's a manual I wonder if that is a catch-all the also includes the differential. I know the eDiffs have issues if battery voltage is low so it's possible it tried to do something with the eDiff and couldn't because of low voltage.