Pressure Control Solenoid B Stuck On

Where it lives

For P0777, the part to look at first is the solenoid named here.

Check these first

• Pressure control solenoid B stuck open
• Debris holding the solenoid B valve open
• A short keeping the solenoid B energized
• Low line pressure from a stuck valve
• A TCM driver fault

What to do next

1. Read line pressure data on a scan tool
2. Command pressure control solenoid b and watch line pressure
3. Test the solenoid B circuit for a short
4. Check the fluid for debris
5. Replace the solenoid if pressure will not drop
6. Clear the code and retest

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