U028DLost Communication With Active Aerodynamic Feature Control Module A
- Generic OBD-II code · Network
- How the car detects it
- Active aerodynamic features change the airflow around the body while driving, for example an extending front air dam, a movable wing or ride height that drops at speed. CARB defines them as active off-cycle technologies, cites grill shutters and speed-dependent ride height as examples and requires counters that record how long they are deployed. U028D is set when the first control module of such a feature stops sending on the network. No manufacturer documents U028D publicly. The front air dam has its own code: Ram 1500 owners see the check engine lamp with U0645 for lost contact and C0604 for poor function, and FCA's procedure starts with a check for impact damage before cycling the dam with the scan tool. Without the module, the element stays in its last position.
- What you may notice
- Active aero warning message in the cluster
- Element does not deploy or retract
- Slightly higher consumption at highway speed
- Likely causes
- LikelyElement or its wiring damaged by kerbs, snow or debris
- PossibleWater or corrosion at the module connector
- PossibleFuse, supply or ground of module A faulty
- RareControl module A internally failed
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.