B3A20

Active Aerodynamic Feature Control Module A

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$222–556 (est.)

Symptoms

Active aerodynamic elements do not work
Dashboard warning
Reduced aerodynamic efficiency

Causes

Control module malfunction
Open or short circuit in wiring harness
Module power problems
Mechanical failure of moving parts
Module software error

How to Fix

Diagnostics using an OBD-II scanner
Checking the module's power and control circuits
Checking the wiring harness for damage
Mechanical diagnostics of moving elements
Reprogramming or replacing the module if necessary

Related codes

B3A21 B3A22 U0121