P0749
Pressure Control Solenoid A Intermittent
Transmission (line-pressure control)
Generic OBD-II
Medium
What it means
P0749 means the transmission control module has seen an intermittent electrical fault in pressure-control solenoid A, the valve that regulates transmission line (fluid) pressure. Because the fault comes and goes, shifts can feel normal one moment and harsh or slipping the next. Intermittent faults usually trace back to wiring or connectors rather than the solenoid itself.
Medium
Can I keep driving? Drivable, but expect harsh or slipping shifts that come and go; fix it before the fault turns constant, since low line pressure wears the clutches.
Common symptoms
What you'll notice
- Harsh, delayed, or erratic gear shifts that come and go
- Transmission slipping under load
- Transmission may briefly drop into limp mode
- Check-engine light on
Common causes
Most likely first
- Loose, corroded, or damaged wiring or connector at the solenoid (typical of intermittent faults)Likely
- Failing pressure-control (EPC) solenoid ACommon
- Low or contaminated transmission fluid affecting the solenoidCommon
- Faulty transmission control module (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame and wiggle-test the solenoid harness to try to reproduce the dropout.
- Inspect and repair the solenoid connector and wiring for corrosion or loose pins.
- Check transmission fluid level and condition; service if contaminated.
- Measure solenoid resistance against spec and replace the pressure-control solenoid if out of range.
- If wiring and solenoid are good, have the TCM evaluated.
FAQ
Quick answers
Is it safe to drive with P0749?+
Short-term yes, but slipping and harsh shifts from low line pressure can wear the clutches, so don't put off the repair.
Can I just clear P0749?+
You can, but because the fault is intermittent it will set again the next time the solenoid signal drops out until the wiring or solenoid is fixed.
Related codes
Often seen with P0749
Read & clear P0749 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