This is the best summary I could come up with:

But most call an ALDL the OBD-II port because it provides everyone from engineers at proving grounds to dealership technicians to shade tree mechanics a connection to the vehicle's software and diagnostic systems.

Modern onboard diagnostics, or OBD-II, became a standardized and mandatory part of every automobile sold in the United States, starting with the 1996 model year.

The ALDL port originated from General Motors in the early 1980s in its pursuit to produce systems and diagnostics for its cars to meet new government emissions regulations.

By the late '80s, the California Air Resources Board (CARB) got involved and mandated that all 1991 model-year or newer cars sold there must include an onboard diagnostics system to manage and control emissions.

But as EVs become more mainstream, they include a variety of sensors and systems to keep everything running optimally, oftentimes more than any internal combustion engine-powered vehicles.

Part of California's sweeping set of rules for cars sold in the state requires EVs, hydrogen fuel cells, and Plug-in Hybrids to follow a similar diagnostics standard, much like OBD-II did 30 years earlier.

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