I would look online and see if there’s a reset procedure that could be done either by disconnecting the battery or with a scan tool. Someone here might know that. I’m a lot more familiar with GM’s stuff. If a reset isn’t possible or doesn’t help, it sounds like you’re on the right track with the other options. Is the thermostat for the control module replaceable separately and pretty cheap? If not, it might pay to have someone hook a scanner to it and diagnose it before spending too much on parts.
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