What it means
A fault has been detected in the pressure control solenoid A circuit or operation. The code alone does not establish that this solenoid controls main line pressure.
At a glance
- Usually lights the check-engine light
How it works
Pressure control solenoid A is an electronically controlled transmission valve that helps regulate hydraulic pressure for transmission operation. The transmission module detects a fault in solenoid A’s circuit or operation, but P0745 by itself does not show that it controls main line pressure. Depending on the transmission, shifts may become delayed, harsh, or unavailable.
Common causes
Most likely first.
- Pressure control solenoid A fault
- Open or short in solenoid wiring
- Poor connector contact
- Valve body or hydraulic pressure fault
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Record freeze-frame data and scan transmission live data for pressure control solenoid A command, gear behavior, and related codes to identify when the fault occurs.
- Check the transmission fluid level and condition using the manufacturer's procedure, since low or degraded fluid can affect hydraulic operation.
- Inspect solenoid A’s connector and harness for corrosion, loose terminals, fluid intrusion, or damaged wiring.
- Test solenoid A’s coil and circuit continuity against the manufacturer's specification, checking for opens and shorts.
- If electrical tests pass, follow the manufacturer's procedure to assess solenoid A operation, valve body movement, and hydraulic pressure.
Common fixes
- Correct the fluid level or service fluid if the manufacturer's procedure and condition call for it.
- Clean and secure solenoid A’s connector or repair damaged terminals.
- Repair an open or short in solenoid A’s wiring.
- Replace pressure control solenoid A if testing confirms it is faulty.
- Repair a sticking valve body or hydraulic fault if testing identifies one.
Can I keep driving?
Avoid hard acceleration, towing, and long trips if shifts are harsh, delayed, slipping, or the transmission enters a restricted gear. Stop driving if it loses drive or slips severely, since continued operation can quickly worsen transmission damage.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.