P0533 on BMW: How to Diagnose & Fix
A/C Refrigerant Pressure Sensor Circuit High
1 BMW model · 3 documented issues · 1 critical · $300-$22,000 repair
P0533 on BMW by model: symptoms, diagnosis and fix
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)
The BMW i3's cabin heating relies on a high-voltage electric heater (resistive element) that draws significant power from the HV battery, reducing range by 20-40% in cold weather. The electric heater element can fail, leaving the cabin without heat. Additionally, the heat pump (standard on later models, optional on earlier ones) can fail, reverting to resistive heating only and dramatically increasing energy consumption. The i3 does not have waste heat from an ICE to heat the cabin (BEV models), making the HVAC system critical for cold-climate usability. Blower motor failures and HVAC control module issues are also reported across all years.
Common Symptoms
- No cabin heat in cold weather
- Dramatic range reduction in winter (40%+ loss)
- HVAC blower runs but only blows cold air
- Climate system error messages
- Unusual smells or sounds from HVAC vents
- Heat pump compressor not engaging (heat pump-equipped models)
How to Fix
Electric heater element replacement ($800-1,500). Heat pump compressor replacement uses same compressor as AC system (64529496107) at $1,756-4,000. Blower motor replacement $300-600. HVAC control module reprogramming or replacement $500-1,000. Pre-conditioning the cabin while plugged in (before driving) reduces range impact significantly. Some owners install aftermarket heated seats and steering wheel to reduce HVAC load.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine BMW I01 electric A/C/heat-pump compressor 64529496107OEM64529343806; 64526830620; 64529364868; 64529347662; 64529320855Cross-ref64529496107
Confirmed electric compressor failure on an applicable heat-pump-equipped i3. Fitment: 2014-2021 BMW i3/i3s I01 catalog fitment, but use for this card only after HVAC diagnostics and option/VIN confirmation identify the compressor as the…
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Sources for this issue (1)
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)
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 on a BMW?
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 BMW it is documented across 1 model: i3.
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 on a BMW?
Published repair estimates on BMW range from $300 to $22,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0533 on a different make?
View P0533 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.