U0256 low

Lost Communication With Active Aerodynamics Module

Can I Drive?
Yes, But Fix Soon
DIY Difficulty
moderate
Estimated Cost
$300 - $1,200 (parts and labor)

What does U0256 mean?

The U0256 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Active Aerodynamics Module. This is a low severity code.

Common Symptoms

  • Active grille shutters not operating
  • Rear spoiler not deploying at speed
  • Underbody aero flaps stuck
  • Aerodynamic efficiency warning light

Probable Causes (Ranked by Likelihood)

  • Failed active aero actuator Very High
  • Aero module communication failure High
  • CAN bus wiring fault Moderate
  • Debris blocking aero components Low

Step-by-Step Diagnostic Procedure

  1. Inspect active aero components for debris

  2. Check actuator motor operation

  3. Scan active aero module for codes

  4. Test CAN bus communication at module

Frequently Asked Questions

Can I drive with U0256?

Yes. Fuel economy may decrease slightly without active aerodynamics.

What causes U0256?

Usually a failed actuator motor or debris blocking the aero components.

What are active aerodynamics?

Movable body panels that adjust at speed to reduce drag and improve efficiency or downforce.

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