Clutch 2 Remains Mechanically At Excessively High Pressure After Rapid Filling

P17B8

Diagnosis information - PDK

Clutch 2 remains mechanically at excessively high pressure after rapid filling

Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are then tested and any faults are stored.

- Ignition on
- The following faults are not detected: P0846, P0848, P181B

Possible fault causes
- Shunt in wiring harness
- Clutch faulty
- Hydraulics faulty

Fault setting conditions
- Pressure in target gear > filling pressure + offset (10 bar)

Fault effects
- Open clutches 1 and 2
- Disengage all gears
- Moving off in 2nd gear
- Only gears 1, 3, 5 and 7 are possible
- Transmission limp-home indication in instrument cluster control unit