Lost Communication with Active Aerodynamic Feature Control Module D

Where it lives

For U0290, the part to look at first is the module named here.

Check these first

• An open or shorted bus wire to active aerodynamic module D
• Internal failure of the active aerodynamic module D
• Corroded or damaged pins at the module connector
• A jammed actuator or panel on the module
• A voltage drop on the module power feed

What to do next

1. Verify power and ground at active aerodynamic module D
2. Inspect the connector pins for corrosion or damage
3. Check the actuator linkage for binding
4. Look for a voltage drop on the module supply
5. Replace the active aerodynamic module D if it stays silent
6. Clear the code and retest

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