P0533: How to Diagnose & Fix — A/C Refrigerant Pressure Sensor Circuit High
3 vehicles · 3 makes · $200-$22,000 repair
How to diagnose and fix P0533: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
BMW i3 · 2014–2021
The i3 uses a high-voltage electric AC compressor that can fail prematurely, leaving the car without air conditioning. The compressor operates on the high-voltage system and failures are often related to internal electrical faults or refrigerant leaks that damage the compressor motor windings. Replacement is expensive due to the HV-rated component.
Common Symptoms
- No cold air from AC
- AC compressor not engaging
- Unusual noise from AC system
- AC fault warning in iDrive
- Intermittent cooling
- Reduced range when AC is on (more than normal)
How to Fix
Replace the electric AC compressor assembly. This requires a certified HV-trained technician to safely de-energize the high-voltage system before working on the compressor. The system must be evacuated, the compressor replaced, and the system recharged with the correct amount of R-1234yf refrigerant.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine BMW I01 electric A/C compressor 64529496107OEM64529343806; 64526830620; 64529364868; 64529347662; 64529320855Cross-ref64529496107
Installation is restricted to an appropriately equipped HV-trained A/C technician; confirm VIN, label specifications and contamination state..
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Sources for this issue (1)
Toyota Prius C · 2012–2019
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.
Common Symptoms
- A/C blows warm air
- A/C compressor not engaging (no click or hum)
- Intermittent A/C — works sometimes, not others
- A/C compressor making grinding or whining noise
- Reduced A/C performance in hot weather
How to Fix
Replace the electric A/C compressor assembly (includes internal inverter board). Use ONLY Toyota-specified ND-11 PAG oil — standard PAG oil lacks the electrical insulating properties required for electric compressors and will cause arcing on the inverter board. Evacuate and recharge the system with R-134a after replacement. Check for moisture in the system using a vacuum test — hold 500 microns for 30 minutes minimum.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 88370-15010 electric A/C compressor assembly with motor
replace a diagnostically confirmed failed high-voltage electric compressor using hybrid-safe recovery and oil procedures Fitment/availability: 2012-2019 Prius C 1.5L 1NZ-FXE; supersedes 88370-52010, 88370-52011 and 88370-52012, but confi…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipONLY use ND-11 PAG oil in the Prius C electric compressor — regular PAG 46 oil will destroy the internal inverter board within months
- TipRun the A/C for at least 10 minutes weekly even in winter — this lubricates the compressor seals and prevents moisture buildup that kills the inverter board
- WarningNever add stop-leak or refrigerant with sealer to a Prius C — the sealant clogs the electric compressor scroll mechanism and destroys it
BMW i3 · 2014–2021
The BMW i3 uses a unique direct-refrigerant battery cooling system where the A/C compressor circulates refrigerant through microchannel extrusions in the battery pack. When the electric compressor fails internally, metal shavings from bearing spalling contaminate the entire refrigerant circuit including the battery cooling channels. This "Black Death" scenario can total the vehicle as the battery cooling system cannot be flushed - requiring full battery pack and cooling system replacement ($10,600-$22,000+). BMW produced 6 different compressor revisions between 2013-2019, indicating ongoing reliability issues. The i3 lacks an industry-standard AC trap/filter in the dryer that would catch debris. Failures most common in hot climates (Arizona, Florida, Texas). CARB-state vehicles have 15-year/150,000-mile compressor warranty coverage; other states get 7-year/70,000-mile coverage as an emission-related component.
Common Symptoms
- Loud whirring or "mooing" (cow-like) sound from compressor area
- Metallic rattling noise preceding failure
- A/C stops blowing cold air
- Battery thermal management warnings
- Reduced charging speed due to overheating battery
- Fault code 801252: "Electric A/C compressor internal fault detected"
- Drivetrain power reduction in hot weather
How to Fix
If caught early (noise but still functioning), replace compressor before catastrophic failure. Latest OEM compressor: BMW 64529496107 (supersedes 64529320855, 64529343806, 64529347662, 64529364868). FCP Euro price ~$1,756. If metal contamination has occurred, entire system including battery cooling channels must be replaced ($10,600+). MUST use POE (Polyolester) anti-electrostatic compressor oil - standard PAG oil will destroy EV compressors. Independent AC shops that understand EV compressors can save 60-80% vs dealer. RYC Automotive offers remanufactured compressor (RYC-i3-01) as budget option. Aftermarket Nissens condenser ($152) available vs OEM ($581 via FCP Euro).
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine BMW I01 electric A/C compressor 64529496107OEM64529343806; 64526830620; 64529364868; 64529347662; 64529320855Cross-ref64529496107
Confirmed failed I01 electric compressor replacement when the system is suitable for that repair. Requires HV-trained A/C service, VIN confirmation, contamination inspection, correct oil/refrigerant and the complete BMW repair procedure..
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
BMW i3 · 2014–2021
Chevrolet Malibu · 2008–2020
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P0533 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0533 mean?
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.
What are the most common causes of P0533?
The most common causes of P0533 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0533?
Repair costs for P0533 range from $200 to $22,000, depending on the vehicle and root cause.
Which vehicles are affected by P0533?
Au7o has documented P0533 across 3 vehicle models from 3 manufacturers: BMW, Chevrolet, Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.