P0777Transmission

Pressure Control Solenoid B Stuck On

P0777 means pressure control solenoid B is stuck on or activated when it should modulate. Line pressure stays at the wrong level, which causes harsh shifts or clutch problems.

🚗 Limited. A pressure control solenoid stuck on can cause harsh shifts or wrong pressure and transmission damage.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Faulty pressure control solenoid B stuck on$150-$500

35%

A stuck solenoid holds line pressure at the wrong level.

#2Valve body sticking or debris$300-$900

25%

A stuck valve holds pressure applied.

#3Low or degraded transmission fluid$100-$300

25%

Contaminated fluid can hold the solenoid on.

#4Wiring short in solenoid circuit$100-$300

15%

A short keeps the solenoid energized.

🩺 Common Symptoms

Harsh shifts
Slipping or bind-up
Limp mode
Check engine light
Poor shift quality

💰 Repair Cost: DIY vs Shop

DIY Cost

$100-$500

Shop Cost

$200-$900

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P0777

1Check fluid level and condition first

2Scan line pressure data with a scan tool

3Test the pressure control solenoid circuit for a short

4Inspect or service the valve body if needed

❓ Frequently Asked Questions

Can I drive with P0777?

Only briefly. Wrong line pressure causes harsh shifts and can damage the transmission. Repair it soon and check fluid first.

What does stuck on mean?

Pressure control solenoid B stays activated instead of modulating, holding line pressure at the wrong level.

How much to fix P0777?

A solenoid or fluid service is $200-$500. Valve body work can reach $900.

🔗 Related Codes

P0776P0745P0752P0757P0731