P0745–P0795 Pressure Control Solenoid A
The ECU has logged a fault on P0745. The definition below is the exact wording the standard uses for this code.
Can you drive it? The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
P0745 | Pressure Control Solenoid A | Investigate soon |
P0775 | Pressure Control Solenoid B | Investigate soon |
P0795 | Pressure Control Solenoid C | Investigate soon |
The definition
P0745: Pressure Control Solenoid A.
P0745 is a powertrain code (the engine or gearbox), defined by the SAE standard - it means the same thing on any make of car, and any generic OBD-II reader will decode it.
What to check first
Cheapest and fastest checks first:
- Read the freeze-frame data stored with the fault - engine speed, load and temperature at the moment it logged tell you whether this happens cold, hot or under load.
- Check the connector at the part for corrosion, and that it is fully seated.
- Clear the code and see whether it returns, and under what conditions.
What actually causes this on a VAG
In an automatic gearbox - torque converter automatic or DSG/S tronic - hydraulic pressure does all the clutch and shift work, and electrically controlled valves regulate that pressure. "Pressure Control Solenoid A" is the generic OBD name for one of those regulating valves, which on VAG boxes lives inside the valve body or mechatronic unit rather than being a part you can bolt on from outside. Symptoms range from harsh or slurred shifts and a shudder on take-up, through to slipping, or the gearbox dropping into emergency mode with only one or two gears available.
Most likely causes, in order
- Old, low or contaminated gearbox fluid. A clogged filter or strainer starves the valve, and worn friction material circulating in the oil makes valves stick in their bores. Ask when the fluid and filter were last changed - many owners are told these boxes are "sealed for life", which they are not in practice. A VAG fluid level check is only meaningful at the specified fluid temperature, so a cold dipstick or plug check tells you very little and can leave the box overfilled or starved.
- Oil-contaminated wiring at the gearbox connector. The sealed pass-through plug where the loom enters the gearbox is a known weak point on VAG boxes. Gearbox oil wicks up inside the wires and into the connector, corroding the pins and distorting the signals. Unplug it and look for an oily or greasy film on the pins and inside the plug body - if it is wet with ATF, you have found a real fault and it is far cheaper than what people usually get quoted.
- The solenoid or valve body itself. The valve can stick mechanically from varnish and debris, or fail electrically. This is normally confirmed from live data in the transmission module - what the box is commanding that valve to do against what it actually achieves, where your equipment and that particular gearbox make those figures available - rather than by guesswork. On a DSG, this valve is inside the mechatronic unit.
- Transmission control module. Uncommon, and only after the fluid, the connector and the valve body have been properly ruled out. Water ingress at the module's location is the usual route to this one on VAG cars.
Worth knowing: Read the gearbox module with VAG-specific software rather than a generic code reader. VAG's own fault text names the specific valve, whereas the generic "Solenoid A" label does not map reliably onto a particular VAG component - so acting on the generic name alone can send you after the wrong valve. If the box has dropped into emergency mode you may be left with a single gear and no kickdown, which is a genuine hazard joining a fast road, so drive it gently or have it recovered rather than pressing on. And have the fluid and filter done to the correct specification before anyone quotes you for a mechatronic unit; on a neglected box it is often the whole story, at a small fraction of the cost.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.
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Common questions
What does P0745 mean?
P0745 means Pressure Control Solenoid A. It is logged when the ECU sees this circuit outside its expected operating window.
Can I drive with P0745?
The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.