SHELBY GT 350 Member
Joined: Jan 2011
Location: Central Massachusetts
Do you have "Service Advancetrac" message by any chance? If so, see "service advancetrac" thread in the 2010-2014 section.
The normal / basic scanners only read "engine codes" not "body codes" so that is why it is not helping with this.
Sorry, I don't really know the cause of your issue; but first thought is to make sure your battery is good and fully charged, because when they get weak all kinds of weird electronic things can happen, apparently caused by the computer not being happy with the voltage signals it is receiving.
| 2010 GT coupe | Daily Driver with some Steeda and GT500 take-off stuff for the occasional track day