B0641moderate severityBody
A/C Refrigerant Pressure Sensor Circuit
on 2021 Lincoln Aviator 3.0L V6 Twin Turbo · AWD
What this code means
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.
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B0002
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B0002
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B0003
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B0003
Passenger Frontal Stage 1 Deployment Control
B0004
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B0004
Passenger Frontal Stage 2 Deployment Control
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B0005
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