OEMs use codenames because they're often sending/receiving parts to/from external suppliers, e.g. when driveshafts go around random warehouses and logistics com

OEMs use codenames because they're often sending/receiving parts to/from external suppliers, e.g. when driveshafts go around random warehouses and logistics companies they have the codenames on the boxes and stickers. they impose the same rules on tier 1 suppliers in order to maintain secrecy and streamline communication, that way everyone is referring to the same project using the same naming convention while preventing incidental leaks