B3A11

A/C Refrigerant Expansion Valve Actuator Control Circuit Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Reduced air conditioner efficiency
The air conditioner blows warm air
Unstable operation of the air conditioning system
Check Engine light comes on

Causes

Refrigerant expansion valve malfunction
Open or short circuit in wiring harness
Poor contact in control circuit connectors
Air conditioning control unit malfunction
Low refrigerant level in the system

How to Fix

Check the refrigerant level in the system
Inspect the wiring harness and connectors for damage.
Check resistance and power supply to valve control circuit
Replace expansion valve if necessary
Test the operation of the system after repair

Related codes

B3A12 B3A13 B3A14