B3A12

A/C Refrigerant Expansion Valve Actuator Temperature Range/Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Reduced air conditioner efficiency
Uneven interior cooling
Complete failure of the air conditioning system
Unusual noises from the air conditioning system

Causes

Expansion valve actuator malfunction
Problems with the wiring harness or connectors
Low refrigerant level
Malfunction of the climate control control unit
Dirty or clogged expansion valve

How to Fix

Check the refrigerant level and top up the system if necessary.
Inspect the wiring harness and connectors for damage or corrosion.
Check resistance and voltage at valve actuator
If necessary, replace the expansion valve or its actuator
Test the air conditioning system after repair

Related codes

B3A11 B3A13 B1999