P0533
A/C Refrigerant Pressure Sensor "A" Circuit High
A/C pressure sensor signal voltage above the upper threshold — short to supply, defective sensor, or a system overcharge/blocked condenser causing genuine high pressure.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Condenser blocked or fan inoperativePossible
- Sensor circuit shorted to supplyPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- AC Pressure Sensor
- AC Condenser
P0533 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.