Emissions. Most things about ICE cars come through EPA and CARB.
I'm pretty sure that the only diagnostic codes that an ECU is required to output are emissions-related codes. Since EVs have no emissions, I'm gonna guess they can force all diagnostics through the dealer if they really want to.
alt Hacker News
I'm pretty sure that the only diagnostic codes that an ECU is required to output are emissions-related codes. Since EVs have no emissions, I'm gonna guess they can force all diagnostics through the dealer if they really want to.