B3A31

Active Aerodynamic Feature Control Module D Power Mode Circuit Low Voltage

Severity

✅ Low

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$33–278 (est.)

Symptoms

Active aerodynamics fault indicator on the panel
Aerodynamic elements are fixed in one position
Slight increase in fuel consumption
The general body system malfunction indicator is on
Error code persists after reset

Causes

Weak or dead battery
Alternator fault (low charging voltage)
Oxidation of the module power connector
Open or high resistance in the power circuit
Module power fuse or relay faulty

How to Fix

Check battery voltage and alternator charging
Read error codes and check the module supply voltage in real time
Inspect the power connector of the aerodynamics module for oxidation
Check the fuse and relay of the module power supply circuit
Eliminate voltage loss in the circuit (charge the battery, replace the generator, repair the wiring)
Reset codes and check system operation

Related codes

B3A30 B3A32 B3A51