I take issue with the “global microchip shortage” excuse. GM made the
corporate decision to go with the cheap remedy of an OBD port dongle
long before there was an such shortage. And neither would it preclude a
proper response of promising to procure...
I agree. And an alternative does exist: Having a dealer service
department swap out the Telematics Communication Module with a later
version that supports at least OnStar Generation 10 (4G LTE). (The
module goes by different names in different models...