P0533 - A / C REFRIGERANT PRESSURE SENSOR "A" CIRCUIT HIGH

The A/C Refrigerant Pressure Sensor’s main function is to allow the HVCA System (Heating, Ventilating and Air Conditioning) to adjust the internal temperature of the vehicle. This sensor converts the refrigerant pressure into an electrical value that is sent to the ECM (Engine Control Module) to determine the pressures and, consequently, activate or deactivate the compressor.

When the P0533 OBDII diagnostic code is stored, it is because the ECM found that the A/C Refrigerant Pressure Sensor “A” has a voltage above the allowable voltage.

• Check Engine light illuminates.
• Fluctuations in fan air temperature.
• Unable to activate the air conditioning compressor.
• Unstable operation of the vehicle's air conditioning.

The reasons for setting the P0533 OBD2 fault code are:

• Coolant pressure may not be sufficient due to low coolant level.
• There may be connectors or wires with damage resulting in a short circuit.
• Possibly the A/C Refrigerant Pressure Sensor is leaking refrigerant in its vicinity.
• The A/C Refrigerant Pressure Sensor may be in poor condition.

To troubleshoot DTC P0533 OBDII code do the following:

• To start with the diagnosis, you must consult the TSB.
• Make sure that the coolant level is adequate for the correct performance of the system. If you determine that the level is below the required level, verify that it is not due to leaks. Make the appropriate adjustments.
• Use a scanner to monitor the coolant pressure to check the performance of the sensor. Verify that the air conditioning refrigerant pressure sensor has no damage to its connector. Check that the connector pins are not bent or corroded. Make any necessary repairs.
• Check the wires related to the system for damage such as corrosion, wear or burns. Repair or replace it as necessary.