2004 Chevrolet Avalanche with engine code P0530

Question

I replaced the engine, and the air conditioning, prior to the engine replacement, was working fine. After the new engine, the A/C is not working and I'm getting the engine code P0530

Answer 1

P0503 A/C refrigerant pressure sensor circuit malfunction.

Poor connection at the A/C pressure sensor can cause this code, or the pressure sensor itself, even low refrigerant.

 

Answer 2

P0530 Chevrolet Code - Air Conditioning Refrigerant Pressure Sensor Circuit
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