Sounds like something has happened to one of the main grounds between the frame and body engine and body or both. Seen a 2019 a dealer said needed and ECM TCM and I don’t know how many other modules and wanted 10k to do the repair and could not explain why all these failed. This was a stock I lifted truck. Took it to someone with some sense and the corrosive things they use on our roads had ate through that wonderful 10 cent braided uninsulated grounf between the frame and body. Old boy put a nice insulated heavy cable on it good to go.
