A/C Refrigerant Pressure Sensor Circuit
2014-2014 Lincoln MKX 3.7L V6
The 2014 Lincoln MKX is equipped with a 3.7L V6 engine. Below you'll find detailed b0641 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Malfunction in the A/C refrigerant pressure sensor circuit. The sensor monitors system pressure for compressor protection.
Symptoms
- A/C not engaging
- A/C blows warm air
- A/C cycles on and off rapidly
- Incorrect pressure reading on scan tool
Common Causes
- Faulty pressure sensor/transducer
- Wiring damage
- Low refrigerant level
- Sensor connector corrosion
- PCM input circuit fault
Diagnostic Steps
- Read pressure sensor value with scan tool
- Compare electronic reading to gauge reading
- Test sensor voltage output
- Inspect sensor connector
- Check wiring to PCM
Repair Notes
Replace refrigerant pressure sensor or repair wiring. Check refrigerant charge level.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0005Driver Knee Airbag Deployment Circuit
B0641 on Other Vehicles
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2020-2020 3.0L Twin-Turbo V6
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2020-2020 3.0L V6 Twin Turbo
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2020-2020 3.0L V6 Twin Turbo Hybrid
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2021-2021 3.0L Twin-Turbo V6
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2021-2021 3.0L V6 Twin Turbo
Common Questions
What does code B0641 mean on a 2014-2014 Lincoln MKX?
B0641 stands for "A/C Refrigerant Pressure Sensor Circuit". Malfunction in the A/C refrigerant pressure sensor circuit. The sensor monitors system pressure for compressor protection.
What are the symptoms of B0641 on a Lincoln MKX?
Common symptoms of B0641 include: A/C not engaging, A/C blows warm air, A/C cycles on and off rapidly, Incorrect pressure reading on scan tool.
What causes B0641 on a 2014-2014 Lincoln MKX?
Common causes of B0641 include: Faulty pressure sensor/transducer, Wiring damage, Low refrigerant level, Sensor connector corrosion, PCM input circuit fault.
Last updated: March 2026