B3A28

Active Aerodynamic Feature Control Module B Power Mode Circuit High Voltage

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Incorrect operation of active aerodynamic elements (spoilers, deflectors)
Malfunction indicator light comes on
Reduced control efficiency at high speeds

Causes

Active aerodynamics control module B malfunction
Damaged wiring harness or corroded contacts
Problems with the generator or voltage regulator
Short circuit in power supply

How to Fix

Check the voltage in the module power circuit
Inspect the wiring harness for damage
Check the operation of the generator and voltage regulator
Replace the control module if necessary

Related codes

B3A27 B3A29 P0562