Clutch 1, Implausible Control Pressure

P17B7

Diagnosis information - PDK

Clutch 1, implausible control pressure

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: P0841, P0843, P181A

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

Fault setting conditions
- Actual pressure at clutch 1 < touchpoint + offset (1 bar)
- Actual pressure at clutch 1 < prefilling pressure + offset (0.6 bar)

Fault effects
- Open clutches 1 and 2
- Disengage all gears
- Moving off in 2nd gear
- Only gears 2, 4 and 6 are possible
- Transmission limp-home indication in instrument cluster control unit