P0779 — Pressure Control Solenoid B Malfunction
Drivable short-term, but fix now to avoid damage.
What P0779 means
This code means the transmission control module detected that pressure control solenoid B is not regulating fluid pressure as expected, which affects how smoothly the transmission shifts. It's often caused by a failing solenoid, low or dirty transmission fluid, or wiring problems. Typical fixes include replacing the solenoid, servicing the fluid, or repairing the electrical connections.
Common symptoms
- Check engine light is on
- Harsh or rough gear changes
- Transmission slipping
- Reduced acceleration or power
- Transmission stuck in limp mode
Common causes
- Faulty pressure control solenoid B
- Low or contaminated transmission fluid
- Damaged wiring or poor electrical connections
- Clogged transmission valve body or filter
- Failing transmission control module
Typical repair cost
$200 – $700
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0779 code?
For short distances usually yes, but it's not recommended for long. Faulty pressure control can cause slipping or limp mode, so get it diagnosed soon to avoid further transmission damage.
How much does it cost to fix a P0779 code?
Expect roughly $200 to $700. Replacing the solenoid and servicing fluid is typical, while valve body work or control module issues push the cost higher.
Is a P0779 code serious?
Yes, it should be taken seriously. Improper transmission pressure can lead to slipping and accelerated wear, so prompt repair protects your transmission.
What does the pressure control solenoid actually do?
It regulates the hydraulic fluid pressure that engages the clutches and bands inside the transmission, so when it fails, shifts become rough or unreliable.