Share a caseSign in
TransmissionSeverity Medium: diagnose soon

P0777Pressure Control Solenoid "B" Stuck On

What it means

The pressure control solenoid "B" appears to stay applied when it should be released.

Symptoms

  • Harsh, late or missing shifts
  • Transmission stuck in one gear (limp mode)
  • Check engine or gearbox warning light

Common causes

  • Solenoid stuck mechanically
  • Sticking valve in the valve body
  • Contaminated fluid

What to check first

  1. Check fluid condition
  2. Run the solenoid actuation test
  3. Inspect the valve body
Can I drive with P0777? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

Cases with P0777 (0)

Share yours

No published cases with this code yet.

Colleagues asking about P0777

Ask for help

Stuck on P0777? Describe what you measured and ask the community.

P0777: questions and answers

What does P0777 mean?

P0777: Pressure Control Solenoid "B" Stuck On. The pressure control solenoid "B" appears to stay applied when it should be released.

What are the symptoms of P0777?

Harsh, late or missing shifts. Transmission stuck in one gear (limp mode). Check engine or gearbox warning light.

What causes P0777?

Solenoid stuck mechanically. Sticking valve in the valve body. Contaminated fluid.

How do you diagnose P0777?

1. Check fluid condition 2. Run the solenoid actuation test 3. Inspect the valve body

Can I drive with P0777?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.