C05DE4WD/AWD Clutch A Stuck Engaged
- Generic OBD-II code · Chassis
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Clutch A keeps transmitting torque or stays connected although the controller has ordered it to open. Front and rear axles are then forced to turn together, which shows up as binding, tyre scrub or droning in tight, slow turns. Audi documents the twin code C05ED00 (clutch B stuck engaged) in its quattro ultra AWD module J492; TSB 2051558 traces it to a worn shift fork in the rear differential. For closed clutch 1 in tight corners Audi bulletin 2059057 describes humming and binding and prescribes fresh ATF for that clutch. In Magna's coupling a return spring pushes the plates apart; a seized ball ramp or welded plates defeat it. No public case names C05DE itself.
- What you may notice
- Binding, hopping or tyre scrub when parking or in tight turns
- Droning or vibration from the rear axle
- AWD malfunction message
- Likely causes
- PossibleClutch plates welded or swollen after overheating
- PossibleActuator or ball ramp seized in the applied position
- PossibleAged clutch fluid causing drag and stick-slip
- RareWorn shift fork keeps a dog clutch engaged
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.