P0776
Pressure Control Solenoid "B" Performance or Stuck off
- Severity
- High
- Driving
- Drive only to a garage
Pressure control solenoid "B" is electrically sound but is not controlling pressure as commanded - it is not responding, or is stuck in its off position. Line pressure is therefore wrong, and since line pressure is what holds the clutches together, the transmission will either slip or shift very harshly depending on which way the error goes.
Possible causes
- CommonSolenoid stuck by debris in the fluid
- CommonWorn solenoid no longer regulating accurately
- CommonLow or degraded fluid
- CommonSticking valve in the valve body bore
- PossibleBlocked transmission filter starving the pump
- PossibleWorn pump or internal leak, so pressure cannot be reached
What you might notice
- Harsh or violent shifting
- Slipping under acceleration
- Delayed engagement into drive or reverse
- Limp mode
- Burnt smell from the fluid
What to check, in order
- Check the fluid level and condition first, and look for clutch material in it.
- Check when the transmission was last serviced. A blocked filter produces low pressure that looks exactly like a failed pressure solenoid.
- Compare commanded pressure against actual pressure on the live data screen if the vehicle reports both.
- Read all codes. Ratio codes alongside this one mean the clutches are already slipping.
- A proper line pressure test with a gauge is the way to separate a solenoid fault from a worn pump. It is worth paying for before buying parts.
- Slipping clutches destroy themselves quickly. Do not keep driving a transmission that slips while you decide what to do.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Transmission
P0700P0701P0702P0703P0704P0705P0706P0707P0708P0709P0710P0711P0712P0713P0714P0715P0716P0717P0718P0719P0720P0721P0722P0723P0724P0725P0726P0727P0728P0729P0730P0731P0732P0733P0734P0735P0736P0737P0738P0739P0740P0741P0742P0743P0744P0745P0746P0747P0748P0749P0750P0751P0752P0753P0754P0755P0756P0757P0758P0759P0760P0761P0762P0763P0764P0765P0766P0767P0768P0769P0770P0771P0772P0773P0774P0775P0776P0777P0778P0779P0780P0781P0782P0783P0784P0785P0786P0787P0788P0789P0790P0791P0792P0793P0794P0795P0796P0797P0798P0799