A/C Compressor Clutch Relay Circuit
2024-2024 Tesla Model 3 Standard Range Single Motor RWD
The 2024 Tesla Model 3 is equipped with a Standard Range Single Motor RWD engine (RWD). Below you'll find detailed b0640 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Malfunction in the A/C compressor clutch relay circuit. The relay controls engagement of the A/C compressor.
Symptoms
- A/C not blowing cold air
- Compressor clutch not engaging
- A/C works intermittently
- Relay clicking
Common Causes
- Faulty A/C clutch relay
- Relay control circuit issue
- Low refrigerant triggering cutoff
- BCM or PCM relay driver failure
- Corroded relay socket
Diagnostic Steps
- Check A/C clutch relay
- Test relay with jumper wire
- Check refrigerant pressure
- Test relay control signal from PCM/BCM
- Inspect relay socket for corrosion
Repair Notes
Replace A/C clutch relay. If relay keeps failing, check compressor clutch current draw.
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
- B0007Rear Left Side Airbag Deployment Circuit
- B0008Rear Right Side Airbag Deployment Circuit
- B0009Rear Center Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
B0640 on Other Vehicles
Tesla Cybertruck
2024-2024 Cyberbeast Tri Motor AWD
Tesla Cybertruck
2024-2024 Dual Motor AWD
Tesla Cybertruck
2024-2024 Single Motor RWD
Tesla Model 3
2017-2017 Long Range Dual Motor AWD
Tesla Model 3
2017-2017 Performance Dual Motor AWD
Tesla Model 3
2017-2017 Standard Range Plus Single Motor RWD
Tesla Model 3
2018-2018 Long Range Dual Motor AWD
Tesla Model 3
2018-2018 Performance Dual Motor AWD
Common Questions
What does code B0640 mean on a 2024-2024 Tesla Model 3?
B0640 stands for "A/C Compressor Clutch Relay Circuit". Malfunction in the A/C compressor clutch relay circuit. The relay controls engagement of the A/C compressor.
What are the symptoms of B0640 on a Tesla Model 3?
Common symptoms of B0640 include: A/C not blowing cold air, Compressor clutch not engaging, A/C works intermittently, Relay clicking.
What causes B0640 on a 2024-2024 Tesla Model 3?
Common causes of B0640 include: Faulty A/C clutch relay, Relay control circuit issue, Low refrigerant triggering cutoff, BCM or PCM relay driver failure, Corroded relay socket.
Last updated: March 2026