Network
generic / SAE
U0285
Lost Communication With Active Grille Air Shutter Module B
The vehicle bus reports loss of communication with active grille shutter module B. The aerodynamic flaps in front of the radiator stay in their default position, increasing drag and possibly affecting cooling.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number2 / 85
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: 120–900 €
- Estimated time: 0.5–2 h
- Component: active grille shutter module b
- Component: vehicle bus wiring
- MIL / check engine light
- drive cycle required
Sources
References
sae:J2012