Has anyone experienced at start up of a 2021 f150 all types of warning lights and alarms going off. These will flash until I take my foot off the brake pedal. Warning lights include check brake system, pre collision assist not available, hill start assist not available, Service advance trac, The abs and brake lights also come on. I took to the dealer multiple times. I hate the idea that they are just starting and stopping it for 8 hours a pop. No codes are been stored or thrown. There is an apparent TSB out for this issue, but dealer says they need the code to run the “fix”. This happens very randomly, not at every start up.

 

The problem is the fault has to remain active long enough for a code to be set and stored. I don't know why your dealer isn't willing to try the fix per that TSB. You could try another dealer.