P0779 Code: Pressure Control Solenoid B Intermittent
🟠 Moderate severity · drivable
Usually drivable, but shifting may be inconsistent as the solenoid signal drops in and out.
What P0779 means
The pressure control solenoid B signal drops in and out instead of staying steady. This makes transmission pressure unpredictable, so shifts are fine sometimes and rough or delayed other times. Intermittent faults are most often traced to loose wiring or connectors.
Symptoms
- Check engine light on and off
- Intermittent harsh or delayed shifts
- Transmission slipping at times
- Hesitation when accelerating
Common causes
- most common: Loose, corroded, or damaged wiring in the solenoid circuit
- common: Faulty pressure control solenoid B
- common: Low or dirty transmission fluid
- less common: Faulty transmission control module
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Clean and tighten the solenoid connector and inspect the wiring | Yes | $0–30 |
| Check and top up the transmission fluid | Yes | $20–60 |
| Replace the pressure control solenoid B | Mechanic | $150–500 |
Frequently asked questions
Can I drive with a P0779 code?
Yes, but shifts may be rough one minute and fine the next. Get it checked before the fault causes transmission damage.
Why is P0779 called intermittent?
Because the solenoid signal comes and goes. That's why the light may flicker and why loose wiring is the usual suspect.
How much does it cost to fix a P0779?
A wiring or connector repair can cost $30–$150, while a new pressure control solenoid runs $150–$500.
Related codes
P0775
P0775 Code: Pressure Control Solenoid B
P0749P0749 Code: Pressure Control Solenoid A Intermittent
P0700P0700 Code: Transmission Control System Malfunction
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.