P0533 on Toyota
A/C Refrigerant Pressure Sensor Circuit High
P0533 on Toyota vehicles indicates a/c refrigerant pressure sensor circuit high. Au7o has documented this code across 1 Toyota model — most commonly on Prius C. P0533 means the A/C refrigerant pressure sensor circuit is reading higher than the expected range. This sensor monitors the pressure of the refrigerant in the air-conditioning system so the computer can control the compressor and cooling fans and protect the system from running at unsafe pressures. A 'circuit high' reading usually points to an electrical issue — a short to voltage, a wiring/connector fault, or a failed sensor — though genuinely high system pressure is also possible. The A/C may stop cooling, and the computer may disable the compressor as a precaution. Typical repair costs on Toyota range from $600 to $1,800, depending on the specific model and root cause.
Common Causes of P0533
- •Faulty A/C refrigerant pressure sensor
- •Short to voltage or open in the sensor signal wiring
- •Corroded or loose sensor connector
- •Wiring chafe/damage shorting the circuit high
- •Genuinely high refrigerant pressure (overcharge or restriction)
- •Poor ground or bad reference voltage to the sensor
- •Faulty HVAC control module or PCM
P0533 on Toyota by Model
Toyota Prius C(1 issue)
- Electric A/C Compressor Failure2012-2019
The Prius C uses an electric scroll-type A/C compressor (not belt-driven) that can fail from internal bearing wear or inverter board failure. The electric compressor contains its own inverter board that is susceptible to moisture intrusion and solder joint cracking from vibration. When the compressor fails, the A/C blows warm air. The electric compressor uses a special PAG oil with insulating properties — using the wrong oil during service causes premature inverter board failure.
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View P0533 across all makes →Frequently Asked Questions
What does P0533 mean on Toyota?▼
P0533 stands for "A/C Refrigerant Pressure Sensor Circuit High." P0533 means the A/C refrigerant pressure sensor circuit is reading higher than the expected range. This sensor monitors the pressure of the refrigerant in the air-conditioning system so the computer can control the compressor and cooling fans and protect the system from running at unsafe pressures. A 'circuit high' reading usually points to an electrical issue — a short to voltage, a wiring/connector fault, or a failed sensor — though genuinely high system pressure is also possible. The A/C may stop cooling, and the computer may disable the compressor as a precaution. On Toyota specifically, this code is documented across 1 model.
What causes P0533 on Toyota vehicles?▼
Common causes on Toyota: Faulty A/C refrigerant pressure sensor, Short to voltage or open in the sensor signal wiring, Corroded or loose sensor connector, Wiring chafe/damage shorting the circuit high, Genuinely high refrigerant pressure (overcharge or restriction). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0533 on a Toyota?▼
Repair costs on Toyota range from $600 to $1,800, depending on the specific model and root cause.
Which Toyota models have P0533 documented?▼
Au7o has documented P0533 on 1 Toyota model: Prius C.