Modern vehicles are basically rolling networks. Your old OBD reader just scans...

https://list-wiki.win/index.php/My_OBD_Reader_Says_No_Codes:_Why_Your_Scanner_Is_Lying_to_You

Modern vehicles are basically rolling networks. Your old OBD reader just scans for basic engine codes, but it can’t talk to the dozens of ECUs running your brakes, steering, or transmission