U0290 code meaning
Lost Communication With Active Aerodynamic Feature Control Module D
What U0290 means
Module D is the last of four aerodynamic control addresses and fits vehicles in which aerodynamics are integrated with chassis functions. Ford's Mustang GTD is such a case: its hydraulic system serves both the suspension and the active aero elements, and service message SSM 55237 lists the warning Active Aero Fault together with suspension and front lift messages, caused by vehicle dynamics module software that reports faults wrongly and fixed by reprogramming. U0290 means that controller has lost the fourth aero module entirely. No manufacturer documents U0290 publicly or says which element module D drives. Depending on the design, a failure can freeze one element or cause the vehicle to restrict modes and top speed. For CARB, such parts are active off-cycle technology.
U0290 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0290
- Active aero fault message
- Drive modes or top speed restricted
- Aero element stuck in one position
Common causes of U0290
- PossibleSoftware of module D or the vehicle dynamics controller
- PossibleBus or supply wiring to module D damaged
- PossibleMoisture or corrosion at the connector of module D
- Less likelyModule D internally failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Active aero module dVehicle bus wiring
What each part of U0290 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 90 | The exact fault in that area. |
What to do next
- Note U0290 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0290
What does U0290 mean?
U0290 means "Lost Communication With Active Aerodynamic Feature Control Module D". Module D is the last of four aerodynamic control addresses and fits vehicles in which aerodynamics are integrated with chassis functions. It is a generic code, so it means the same on every make.
Is it safe to drive with U0290?
Drive gently and only to a workshop. With U0290 the car can go into limp mode (reduced power) to protect itself.
Will U0290 fail an emissions test?
U0290 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0290 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will U0290 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.