Troubleshooting 4.3-4 Trouble code DTC Description Fault causes Recommended countermeasures B2709 EXV failed EXV in failure status 1. Test the circuit. 2. Ask the professional maintenance personnel for maintenance. U0073 Body Can involves BusOff Body CAN network involves BusOff 1. Test the circuit. 2. Ask the professional maintenance personnel for maintenance. U0074 LIN communication error LIN network abnormal 1. Test the circuit. 2. Ask the professional maintenance personnel for maintenance. B270A AC communication loss EXV communication loss 1. Test the circuit. 2. Ask the professional maintenance personnel for maintenance. B270B Tee water valve 1 failed Tee water valve 1 failed 1.
Test the circuit. 2. Ask the professional maintenance personnel for maintenance. B2713 Tee water valve 2 failed Tee water valve 2 failed 1. Test the circuit. 2. Ask the professional maintenance personnel for maintenance. B270C Tee water valve 1 communication loss Tee water valve communication loss 1. Test the circuit. 2. Ask the professional maintenance personnel for maintenance. B270D Tee water valve 2 communication loss Tee water valve communication loss 1. Test the circuit. 2. Ask the professional maintenance personnel for maintenance. B270E Compressor abnormal Compressor in failure status 1. Test the circuit. 2. Ask the professional maintenance personnel for maintenance.
B270E Compressor communication loss Compressor communication loss 1. Test the circuit. 2. Ask the professional maintenance personnel for maintenance. B270E Compressor communication failure Compressor communication failure 1. Test the circuit. 2. Ask the professional maintenance personnel for maintenance. B270E Compressor start-up failed Poor release or missing phase of three-phase line Replace the compressor (it is recommended to notify the supplier to check on site before replacing the compressor). B270E Compressor hardware protection IGBT module is damaged. Replace the compressor. B270E High compressor IPM temperature 1. Poor heat dissipation; 2. Too little refrigerant; 3.
Leakage inside the compressor. 1. Inspection the suction pressure, exhaust pressure, and suction temperature; 2. Replace the compressor. B270E Internal stall of compressor 1. Dirty system; 2.Internal damage of compressor; 3. Impurities. Replace the A/C compressor. B270F High compressor bus current 1. High pressure switch failure (component failure/slow); 2. Excessive refrigerant charging; 3. Condenser fan inoperation. 1. Install the pressure sensor to the vehicle. If the pressure rises, check the A/C system. 2. High system pressure (above 25 bar), so it is recommended to add to the standard refrigerant volume (30 ml recommended to be added after refilling) ; 3.
Check if the condenser fan is working properly. B2710 Low compressor voltage Low traction battery voltage Charge the vehicle. B2711 High compressor phase current 1. Refrigerant slugging (high instantaneous phase current); 2. Refrigerant loop blocked; 3. Much refrigerant; 4. Condenser fan damaged. 1. Re-vacuum and add refrigerant; 2. High system pressure (above 25 bar), so it is recommended to add to the standard refrigerant volume (30 ml recommended to be added after refilling) ; 3. Check if the condenser fan is working properly. B2712 High compressor voltage Output voltage of the high voltage terminal exceeds the operating voltage range of the compressor.
Check if the high input voltage of the compressor is higher than 405 V.