Pressure Regulator 4 (System Pressure), Short Circuit To B+

P17A4

Diagnosis information - PDK

Pressure regulator 4 (system pressure), short circuit to B+

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 fault is not detected: P1832
- The following fault is not detected: P183A

Possible fault causes
- Line between pressure regulator 4 and PDK control unit, short circuit to B+
- Pressure regulator 4 faulty
- PDK control unit faulty

Fault setting conditions
- Internal current measurement, actuator solenoid R/P: current consumption = 0 mA
- Pressure regulator 4, control current > 850 mA

Fault effects
- Pressure regulator 4 switch-off
- Engaged gear is held until vehicle stops
- Moving off possible only in 2nd gear
- Transmission limp-home indication in instrument cluster control unit