Advanced Diagnostics

Advanced Diagnostics - DTC P0533: A/C Pressure Sensor Circuit High Voltage










General Description
The A/C pressure sensor measures the change in the pressure of the air conditioning refrigerant. The signal from the A/C pressure sensor is low voltage at low pressure (when the air conditioning load is low) and high voltage at high pressure (when the air conditioning load is high). The engine control module (ECM)/powertrain control module (PCM) compares the expected voltage to the A/C pressure sensor output voltage. When the A/C pressure sensor output voltage is higher than the expected voltage for a set time, the ECM/PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
The A/C pressure sensor output voltage is 4.76 V or more for at least 10 seconds.

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the ECM/PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.

Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.