From the wiring to the sheet metal to the software, automakers that plan to adopt Tesla's plug for their own EVs have bigger design and engineering challenges than just changing the receptacle in the charge port.
So far, General Motors, Ford, Rivian and Volvo have committed to adopting Tesla's North American Charging Standard plugs. Stellantis and Hyundai have said they are considering making the same move. The NACS plug receptacles are scheduled to start appearing on non-Tesla EVs in 2025.
While Tesla's smaller NACS receptacle easily fits behind the charge port doors on other brands' vehicles, engineers have some work to do. And onboard software enabling non-Tesla vehicles to communicate with Tesla chargers has to be created, tested, validated and integrated.