P0531

Symptoms

• Air conditioner doesn't work
• The air conditioner blows warm air
• Check Engine light comes on
• Increased fuel consumption

Causes

• Refrigerant pressure sensor malfunction
• Open or short circuit in the sensor wiring harness
• Poor contact in the sensor connector
• Refrigerant leak
• Engine control unit malfunction

How to Fix

1. Check the refrigerant level in the system
2. Visually inspect the pressure sensor and wiring harness for damage.
3. Check the resistance and voltage at the sensor
4. Check the continuity of the circuit from the sensor to the control unit
5. If necessary, replace the sensor or repair a break in the harness
6. Reset the error and check the system operation

Related codes

Error P0531 by Vehicle Brand