B0641moderate severityBody
A/C Refrigerant Pressure Sensor Circuit
on 2003 Audi A6 2.7L Turbo V6 · 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.
Other Body codes on this vehicle
B0001
Driver Frontal Stage 1 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0005
Driver Knee Airbag Deployment Circuit
B0006
Passenger Knee Airbag Deployment Circuit
B0010
Driver Side Airbag Deployment
B0011
Driver Side Airbag Deployment Circuit Open
B0012
Driver Side Airbag Deployment Circuit Short to Ground
B0013
Driver Side Airbag Deployment Circuit Short to Battery