Plug and Play units, are a direct replacement for the factory unit in your car. No additional wiring is needed when installing a Plug and play ECM, nor an adapter harness. programming. Only the older vehicles are known to be plug-and-play and can be directly installed. However we also offer a range of refurbished ECM’s that come programmed as per your VIN#. Please ask your sales rep for prices on re-furbished units.