Check your OBD2 port for cracks. A crack can keep the plug from making contact correctly, all it takes is for the code reader plug to be pulled at an angle. (old plastic)

Don't ask how I know....[emoji28]

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course