Tiptronic System G100, G101, G102, G110
P0748Control solenoid valve, modulation pressure
Faults in the wiring, connectors, output stage and the valve should be detected.
NOTE: The redundancy transistor is switched off. The setpoint values of the current regulator are set to 0 and all change-over valves are switched off. The control module is then in emergency operation. Minimal cycle is additionally activated.
Diagnosis conditions
- Ignition on
- Redundancy transistor on
- Short circuit to ground/voltage or interruption of the output stage
- Control valve on
Possible fault cause
- Connection to Tiptronic control module is faulty
- Control solenoid valve, modulation pressure is faulty
Affected terminals
Terminal 36
Diagnosis/Troubleshooting
NOTE: If the fault codes 2 (P0753) solenoid 1-2/4-5 shift, 3 (P0758) solenoid valve 2-3 shift, 4 (P0763) solenoid valve 3-4 shift and 5 (P0743) torque converter solenoid valve are displayed together, an open circuit in the circuit to the control module terminal 38 may be present.
