The second pressure control solenoid is not regulating properly. Often felt as one specific gear slipping or refusing to engage.
P0776 — also written PO776, P 0776, 0776 — is the OBD-II code for pressure control solenoid 'b' performance / stuck off. Same code, same fix: this page covers every spelling of it.
P0776 is a transmission fault code, typically costing £250–£2200 to put right in a UK garage.
What causes P0776?
- Sticking solenoid
- Dirty fluid and blocked filter
- Valve body wear
- Internal clutch wear
How P0776 is fixed
- Check fluid condition first — burnt fluid tells you a lot
- Solenoid or valve body replacement
- Full service with correct fluid volume and temperature procedure
P0776 repair cost in the UK
Most P0776 repairs land between £250–£2200 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P0776?
Short distances only, gently.
Urgency: high.
What P0776 is telling you
Gearbox faults are logged when the shift the control unit asked for is not the shift it measured. Fluid condition and level affect that measurement as much as any electrical part, which is why the fluid is checked before anything is dismantled.
On P0776 specifically — pressure control solenoid 'b' performance / stuck off — the stored code records the moment that check failed, not the moment the part gave up. That gap is why two cars with the same code can need completely different repairs.
How P0776 is diagnosed properly
Each of the known causes is ruled in or out in cost order, cheapest and most likely first. On P0776 that means working through them like this:
- Sticking solenoid — commanded on and off with the diagnostic tool while its current draw and movement are watched, which separates a stuck part from a dead circuit.
- Dirty fluid and blocked filter — measured as a pressure or flow difference across the component, so a partial restriction is not mistaken for a clear one.
- Valve body wear — commanded on and off with the diagnostic tool while its current draw and movement are watched, which separates a stuck part from a dead circuit.
- Internal clutch wear — confirmed with live data before any part is bought.
An hour of diagnostic time on P0776 routinely saves more than it costs, because the alternative is buying the most expensive part on that list and hoping.
The repairs that actually clear P0776
- Check fluid condition first — burnt fluid tells you a lot
- Solenoid or valve body replacement
- Full service with correct fluid volume and temperature procedure
After the repair the code is cleared and the car is driven until the relevant readiness monitor completes, rather than handed back as soon as the light goes out. A code that has only been erased will come straight back on the next drive cycle.
What happens if P0776 is ignored
Leaving this one is the expensive choice. The protection strategy the ECU falls into is there to limit damage, and every mile driven with the fault active is a mile the engine or gearbox spends outside its designed operating window.
For reference, P0776 typically lands at £250–£2200 all-in at an independent garage in the UK — main-dealer quotes for the same job usually sit above that.
Getting P0776 looked at
Bob's Mechanical Repairs is an independent garage in Birnam, Dunkeld, Perthshire, with 32 years of Bob's experience on the tools. If P0776 is showing on your car, bring the scan results with you — we will read the live data ourselves, tell you which of the causes above it actually is, and price the repair before any work starts.