P0811Excessive Clutch A Slippage
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0811 means clutch A slips too much while it should be closed – on a dual-clutch gearbox clutch 1 with the odd gears. The module compares engine speed with the input shaft speed of the closed clutch; thresholds are not published. Audi's seven-speed S tronic DL382 (A4 to A7 and Q5, 2020–24) sets it intermittently together with P081E and input speed sensor codes, partly also clutch temperature too high; the cause was the transmission module calculating wrong slip, and the fix was a new module. Genuine slip from wear or overheating shows as flaring take-off and burnt fluid. The module limits torque, may lock out the affected half and go to limp mode.
- What you may notice
- Transmission warning, limp mode
- Engine flares, poor acceleration
- Judder on take-off
- Burning smell
- Likely causes
- LikelyTransmission module calculating wrong slip (speed capture)
- PossibleClutch worn or overheated
- PossibleFluid burnt or wrong (wet clutch)
- PossibleClutch pressure or actuator too low
- RareInput speed sensor faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €400 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.