B0641
A/C Refrigerant Pressure Sensor Circuit
1992-1998 BMW 318i E36 1.8L I4 🇩🇪
Moderate SeverityBody
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
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0006Passenger Knee Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
- B0011Driver Side Airbag Deployment Circuit Open
- B0012Driver Side Airbag Deployment Circuit Short to Ground
- B0013Driver Side Airbag Deployment Circuit Short to Battery
B0641 on Other Vehicles
Common Questions
What does code B0641 mean on a 1992-1998 BMW 318i E36?
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 BMW 318i E36?
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 1992-1998 BMW 318i E36?
Common causes of B0641 include: Faulty pressure sensor/transducer, Wiring damage, Low refrigerant level, Sensor connector corrosion, PCM input circuit fault.