P0748
Pressure Control Solenoid A Electrical
Transmission
Generic OBD-II
Medium
What it means
P0748 means the transmission control module has detected an electrical fault — an open or short — in the pressure control solenoid A circuit. This solenoid regulates internal line pressure, so a fault leads to harsh or slipping shifts and can trigger limp mode until the wiring or solenoid is repaired.
Medium
Can I keep driving? Usually drivable short-term, but harsh shifts or slipping can damage the transmission — drive gently and get it checked soon.
Common symptoms
What you'll notice
- Harsh or delayed shifting
- Transmission slipping or delayed engagement
- May drop into limp mode (a single fixed gear)
- Check-engine or transmission warning light on
Common causes
Most likely first
- Failed pressure control (line-pressure) solenoid ALikely
- Damaged wiring or connector in the solenoid circuitCommon
- Loose or corroded electrical connectionsCommon
- Contaminated fluid affecting solenoid operationLess often
- Transmission control module fault (less common)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note any companion transmission codes.
- Check transmission fluid level and condition — contaminated fluid disturbs solenoid operation.
- Inspect the wiring and connector at the transmission for damage or corrosion.
- Measure the solenoid's resistance against specification and check for an open or short.
- Replace the pressure control solenoid (often part of the valve body); treat the TCM as a last resort.
FAQ
Quick answers
Is it safe to drive with P0748?+
Short trips are usually possible, but harsh shifting or slipping can accelerate transmission wear. Drive gently and repair it soon.
Can I just clear P0748?+
You can, but an electrical fault in the solenoid circuit will set it again quickly. Fix the wiring or solenoid first.
Related codes
Often seen with P0748
Read & clear P0748 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX