Powertrain, generic · Transmission

P0811 Excessive Clutch A Slippage

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Transmission module calculating wrong slip (speed capture)
Clutch worn or overheated
Fluid burnt or wrong (wet clutch)
Clutch pressure or actuator too low
Input speed sensor faulty

Symptoms

  • Transmission warning, limp mode
  • Engine flares, poor acceleration
  • Judder on take-off
  • Burning smell

Repair estimate

DifficultyHardWorkshop job
Parts and labour€400–3,500
Time1–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission clutchestransmission control moduleinput speed sensortransmission fluid

Related codes

P081EP0810P07A2P0715P2768

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.