P0748 Code: Pressure Control Solenoid A Electrical — Causes & Fix
P0748 means an electrical fault in transmission pressure control solenoid "A" — the solenoid that regulates line/clutch pressure.
- Applies to
- All OBD-II vehicles (any make or model)
- Est. repair cost
- $80 – $1,200
- Time to fix
- 1–4 hours
What it means
Causes include a failed pressure control solenoid, dirty fluid, or wiring/connector faults. P0748 is a generic OBD-II code defined in the SAE J2012 standard, so it applies to virtually any 1996-or-newer OBD-II vehicle regardless of make. Fix the underlying fault, then clear the code with an OBD-II scan tool — it will return if the problem isn't resolved.
Symptoms
- Check engine light on
- Harsh or slipping shifts
- Possible limp mode
How to fix it
- 1
Check fluid and wiring
1. Check fluid level/condition. 2. Inspect the solenoid connector/wiring.
- 2
Replace the solenoid
1. Test the pressure control solenoid. 2. Replace it (usually in the valve body), then clear the code.
Frequently asked questions
Can dirty fluid cause P0748?
Yes — contaminated fluid affects pressure control solenoids. A fluid service can help, but an electrical fault means the solenoid needs replacing.
Last updated July 19, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.