Hi,
The code is likely indicating a problem within the HVAC control module or the body control module (BCM). In this case, the BCM isn't receiving a signal from the HVAC module. If both parts are functioning, it sounds like they are, there could be an issue in the controller area network (CAN).
I don't know how familiar you are with the CAN. The Controller Area Network is a communication protocol interconnecting electronic control units (ECUs) within a vehicle. It allows different components and systems in a car to communicate with each other in real time. In this case, the BCM isn't communicating with the HVAC module. That leaves diagnostics to help narrow things down.
If you look below, I attached diagnostics specific to it. Take a look through them and let me know if you are comfortable performing them.
Take care,
Joe
See pics below.
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Saturday, February 3rd, 2024 AT 2:57 PM