P0748 Code: Pressure Control Solenoid A Electrical
🟠 Moderate severity · drivable
Drivable, but shifts may be harsh or slip because the transmission can't control line pressure properly.
What P0748 means
The pressure control solenoid A adjusts transmission line pressure based on commands from the computer. This code means the solenoid's electrical circuit is open, shorted, or reading out of range. Without proper pressure control, shifts become harsh, soft, or delayed.
Symptoms
- Check engine light is on
- Harsh or delayed shifts
- Transmission slipping
- Reduced fuel economy
Common causes
- most common: Faulty pressure control solenoid A
- common: Damaged wiring or loose connector in the solenoid circuit
- common: Low or dirty transmission fluid
- less common: Faulty transmission control module
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Check and top up the transmission fluid level and condition | Yes | $20–60 |
| Inspect and repair the solenoid wiring and connector | Yes | $10–50 |
| Replace the pressure control solenoid A | Mechanic | $150–500 |
Frequently asked questions
Can I drive with a P0748 code?
Yes, but shifting may feel rough or the transmission may slip. Get it diagnosed soon to avoid internal damage.
What is the most common cause of P0748?
A faulty pressure control solenoid A, often from damaged wiring or a loose connector. Dirty fluid can also be involved.
How much does it cost to fix a P0748?
Usually $150–$500 for the solenoid, or less if it turns out to be only a wiring repair.
Related codes
P0749
P0749 Code: Pressure Control Solenoid A Intermittent
P0775P0775 Code: Pressure Control Solenoid B Malfunction
P0700P0700 Code: Transmission Control System Malfunction
Related guide: The 10 Most Common Check Engine Codes →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.