B3A39

Active Aerodynamic Feature A Position Not Plausible

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–333 (est.)

Symptoms

Check engine light is flashing
Active aerodynamic elements do not work
Unusual noises when moving (if the element is stuck)
Reduced aerodynamic efficiency

Causes

Mechanical damage to the aerodynamic element
Drive or motor fault
Wiring Harness Problems
Position sensor malfunction
Control unit software error

How to Fix

Check the mechanical condition of the element
Check the operation of the drive and electric motor
Check the integrity of the wiring harness
Check position sensors
Reset the error and test the system

Related codes

B3A3A B3A3B U0121