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.

Real-world scan data

Seen in

334

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0748 scans

P2716in 21.3% of scans

P0713in 18.3% of scans

P021Din 16.2% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P0748 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX