Current On-Board Diagnostic (OBD) regulations do not include pure electric vehicles (EV), but in recent years the California Air Resources Board (CARB) has indicated they are coming. Original Equipment Manufacturers (OEMs) should ensure the EV technology they build today can easily adapt to future regulations without totally redeveloping their systems. OBD plays a big role in the ability to service a vehicle. The diagnostics, which pinpoint the problem, allow service technicians to fix the issue quickly helping put the customer back on the road. Although EVs do not produce harmful emissions, they will need service when parts fail and the manufacturer will require comprehensive diagnostics to pinpoint the failure. WinterPark Engineering has many years of experience working with various OEMs to help develop diagnostics for Plug-In Hybrid Electric Vehicles (PHEV). As these companies shift to fully Electric Vehicles, we are helping them develop systems so they can easily meet future OBD EV regulations.