Possible causes

– A/C system low or over charged with refrigerant
– Faulty A/C Refrigerant Pressure Sensor
– Cooling fans in-operative
– A/C Refrigerant Pressure Sensor harness is open or shorted
– A/C Refrigerant Pressure Sensor circuit poor electrical connection

When is the code detected?

The P0530 code is detected when the signal circuit is less than 5 counts (0.09 volt) or more than 250 counts (4.90 volts) and the condition exists for 20 seconds.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– A/C Inoperative
– A/C Blows Warm

P0530 Description

The Powertrain Control Module (PCM) monitors the high side refrigerant pressure via a A/C refrigerant pressure sensor. When the pressure is high the signal voltage is high. When the pressure is low the signal voltage is low. When pressure is high the PCM commands the cooling fans on. When pressure is too high or too low the PCM will not allow the A/C compressor clutch to engage.

P0530 Information for specific makes

P0530 BUICK
P0530 CHEVROLET
P0530 MAZDA
P0530 PONTIAC
P0530 CADILLAC
P0530 GMC
P0530 SATURN