Network
generic / SAE
U0645
Lost Communication With Active Air Dam Module
The vehicle bus reports loss of communication with smart active air dam module. The lower-front aero spoiler stays in its default position; aerodynamic drag and front-end cooling can change.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number6 / 45
Possible causes
- Bus wiring open or shorted high
- Module without power or ground medium
- Module failed medium
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–1500 €
- Estimated time: 0.5–3 h
- Component: active air dam module
- Component: vehicle bus wiring
- drive cycle required
Sources
References
sae:J2012