OBD-II Code · Transmission
P0776
Pressure Control Solenoid B Performance
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Not for long
Driving on this one risks further damage. Get it to a shop rather than carrying on with it.
Indicative cost (USD)
$300–$1,500
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Pressure control solenoid B out of range.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Harsh shifts
- Slipping
Likely causes
- Dirty fluidMost common
- Failed solenoid
- Worn valve body
Read the full diagnostic procedureP0776 is the performance code for Pressure Control Solenoid B, meaning the electrical circuit tests fine but the commanded pressure does not produce…
P0776 is the performance code for Pressure Control Solenoid B, meaning the electrical circuit tests fine but the commanded pressure does not produce the expected hydraulic response: line pressure too high, too low, or unresponsive to PWM duty-cycle changes.
Cheapest-first
- install a transmission line-pressure gauge at the test port and compare actual pressure against spec across the duty-cycle range.
- On a healthy unit, EPC duty changes should produce smooth proportional pressure changes (for example, 4L80E should sweep roughly 60 to 250 psi as EPC current sweeps from 1 A to 0 A).
- If pressure is stuck high regardless of command, the solenoid is stuck closed or the valve bore is sticking; stuck low points to a stuck-open solenoid, worn pump, or internal leak.
- Bench-resistance the solenoid against spec (3 to 7 ohms typical for GM force motors, 4 to 6 ohms for most Toyota/Chrysler PC solenoids).
- Inspect the EPC screen/filter for debris and check the boost valve and pressure regulator valve bores for wear, since these are extremely common P0776 root causes on high-mileage units.
- Caveat: a worn pump or excessive internal leakage will mimic a failed PC solenoid by dropping line pressure below command; always confirm with a pressure gauge before condemning the solenoid.
Vehicle-specific patterns2002 to 2008 Chevrolet Trailblazer with 4L60E sets P0776 from boost valve and pressure regulator bore wear in the pump, repaired with Sonnax oversize…
- 2002to 2008 Chevrolet Trailblazer with 4L60E sets P0776 from boost valve and pressure regulator bore wear in the pump, repaired with Sonnax oversized boost valve kit rather than pump replacement.
- 2004to 2010 Ford Expedition/F-150 with 4R75W/4R70W trips P0776 from a worn pressure regulator valve bore, with Ford TSB 09-2-7 documenting harsh shifts and code.
- 2005to 2009 Subaru Outback/Legacy 5EAT sets the equivalent code from duty solenoid C wear, a known issue covered by Subaru TSB 16-78-08.
- 2003to 2010 Toyota Tundra with A750F trips P0776 from internal SLT solenoid contamination and valve body sleeve scoring.
Estimated repair$300 to $1,600.
Look up another code
P0776 — frequently asked
What does a P0776 code mean?
Pressure control solenoid B out of range.
What causes a P0776 code?
Common causes: Dirty fluid; Failed solenoid; Worn valve body.
What are the symptoms of a P0776 code?
Typical symptoms: Harsh shifts; Slipping.
Is it safe to drive with a P0776 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $300-$1,500.
How do I diagnose a P0776 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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