You can get two-digit versions of HVAC codes to display on the AC control LCD. 75 is the same as DTC B1475. If you had a Gen 2, your electric compressor would have three orange wires coming into it, carrying 3-phase AC generated inside the car's big inverter under the hood. The pink coolant pumped through the inverter would be cooling it. However, in your Gen 3, the electric compressor only has two orange wires coming in, carrying DC from the battery. The inverter circuitry that generates the 3-phase AC to run the compressor is right inside the compressor in Gen 3. The refrigerant flowing past cools it. B1475 means that circuitry is overheating. Because it is cooled by the flowing refrigerant, one possible cause is refrigerant being low. The member @lech auto air conditionin has been posting recently a lot about that. It could also be that the compressor is bad, or the fans behind the radiator/condenser aren't running. If you were following the troubleshooting in the manual, you would first confirm that the communication network (CAN) is working right, and then confirm that the fans run when activated, and then go to checking the refrigerant pressure.
