P0745 — Transmission pressure control solenoid malfunction

The code indicates a problem with the transmission’s pressure control solenoid A, which manages hydraulic pressure for shifting gears. It appears when the solenoid is not responding correctly or the transmission fluid pressure is out of range. This can cause shifting issues or transmission performance problems.

Common causes

The cause is almost always one of a few things. Here they are — P0745 rarely comes from anything outside this list:

• Faulty pressure control solenoid
• Dirty or low transmission fluid
• Wiring or connector problems
• Clogged transmission filter
• Internal transmission wear or damage

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Check and top up transmission fluid
2. Inspect wiring and connectors for damage
3. Clean or replace transmission filter
4. Test and replace pressure control solenoid if faulty
5. Inspect transmission internals if problems persist

That is what holds for P0745 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.