I have a 2010 F150 crew, I had a brake controller put on at the RV dealer and my truck went into limp mode. I turned off the ignition and now it will not start, I had to get it towed to my Ford dealer and they have been working on it for 4 straight days (still cannot get it to start) there is a lock and a wrench luminated in the gage cluster...Please help!

Frustrated.