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this post was submitted on 05 Dec 2023
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I think it's worth noting that the obd-2 protocol required by law is ONLY for emissions related parameters. Knock, air/fuel ratio, throttle position, things like that. A lot of manufacturers can get data that's not emissions related (like transmission codes) from the obd-2 port, but with a different/extended proprietary protocol that requires a proprietary (very expensive) scanner.
Basically, I think obd-2 should be expanded to include these other systems and ev systems as well. That would standardize ev diagnostics and non-emissions-related ice diagnostics too, which would be a boon for repairability.