P0533

A/C Refrigerant Pressure Sensor A Circuit High

A/C & refrigerant Generic OBD-II Low

What it means

P0533 means the A/C refrigerant pressure sensor's signal is reading higher than the valid range, usually from a wiring short to voltage or a failing sensor. The computer uses this sensor to manage the A/C compressor and cooling fan, so the main symptom is that the air conditioning may stop working. The engine itself runs normally.

Low

Can I keep driving? Yes — the engine runs and starts normally; the main effect is that the A/C may not work correctly until it's fixed.

Real-world scan data

Seen in

689

scans in the past year

Found in

0.1%

of scans

0.2%

of scans that found faults

Appears alongside · share of P0533 scans

P0113in 25.8% of scans

P2185in 23.8% of scans

P0102in 18.3% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
A/C not cooling or the compressor not engaging
Cooling fan may run more than usual
No effect on how the engine drives

Common causes

Most likely first

Faulty A/C refrigerant pressure sensorLikely
Short to voltage or open in the sensor signal circuitCommon
Corroded or loose sensor connectorCommon
Sensor supply/ground wiring faultLess often
ECM signal-processing fault (least common)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and view the A/C pressure sensor's live voltage.
Inspect the sensor connector and wiring for corrosion, damage, or a short to voltage.
Compare the sensor reading against actual system pressure with a manifold gauge if available.
Replace the A/C refrigerant pressure sensor if it reads high with good wiring.
Clear the code and confirm the A/C engages and the reading is normal.

FAQ

Quick answers

Is it safe to drive with P0533?+

Yes. It's a low-severity fault that doesn't affect the engine. The A/C may not cool properly, but the car is otherwise fine to drive.

Can I just clear P0533?+

It clears, but returns if the pressure sensor or its wiring is still reading high. Fix the sensor or circuit first.

Read & clear P0533 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX