2019 hard steering / tow brakes/ not locating park codes
 

This thread may help someone in the future . I ran across this youtube video on a 2019 chevy truck throwing multiple codes that were mis diagnosed by the dealer . Watch the video but to make a long story short the fix was to replace a corroded ground cable under the truck behind the passenger tire . the dealer charged the customer $500. to diagnose the problems and wanted $3,900.00 to repair them .

https://www.youtube.com/watch?v=8CFZcO4NDhI

ground cable location at 30:40 in video .