OBD-II Code · Powertrain
P0775
Pressure Control Solenoid "B"
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–$2,500
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Second pressure control solenoid fault.
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 or slipping shifts
Likely causes
- Failed solenoidMost common
- Wiring
- Fluid contamination
Read the full diagnostic procedureP0775 indicates an electrical circuit fault in Pressure Control Solenoid B (often called PC-B, EPC-B, or SLT/SLU depending on manufacturer).
P0775 indicates an electrical circuit fault in Pressure Control Solenoid B (often called PC-B, EPC-B, or SLT/SLU depending on manufacturer). This solenoid is a variable-duty PWM device that modulates line pressure or specific clutch apply pressure, and the PCM has detected an open, short, or driver fault.
Cheapest checks
scan for companion codes, then measure solenoid resistance at the case connector. PWM pressure control solenoids run lower resistance than on/off shift solenoids: typical 3 to 7 ohms on GM 4L60E/4L80E EPC, 4.8 to 5.8 ohms on Ford 4R75W EPC, 4 to 6 ohms on Chrysler 45RFE pressure control, and 5 to 6 ohms on Toyota SLT solenoids. The PCM drives them with a PWM signal typically 0 to 100 percent duty cycle at 244 to 614 Hz depending on application, commanding roughly 0 mA at full pressure and 1 amp at zero pressure (current-controlled). If resistance is in spec, verify the PCM is sending the PWM signal by back-probing the control wire with an oscilloscope or graphing multimeter; you should see a clean square wave with varying duty cycle as load changes. Caveat: ATF contamination of the internal harness will read infinite or shorted at the solenoid even though the part itself is good, so always disconnect at the solenoid and test it directly when possible.
Vehicle-specific patterns2001 to 2007 Chevrolet Silverado 2500/3500 with 4L80E sets P0775 from the force motor (EPC) failing electrically after fluid contamination, and GM TS…
- 2001to 2007 Chevrolet Silverado 2500/3500 with 4L80E sets P0775 from the force motor (EPC) failing electrically after fluid contamination, and GM TSB 06-07-30-010 covers updated force motor and filter.
- 2004to 2008 Ford F-150 with 4R75W trips P0775 from the EPC solenoid wiring chafing inside the lead-frame internal harness, requiring lead-frame replacement.
- 2002to 2007 Jeep Liberty with 42RLE sets P0775 from the line pressure solenoid in the solenoid pack failing, covered in Chrysler TSB 21-014-06.
- 2003to 2009 Toyota 4Runner with A750E/F sets the SLT linear solenoid code from internal contamination, and Toyota recommends complete solenoid replacement plus fluid exchange.
Estimated repair$250 to $1,100.
Look up another code
P0775 — frequently asked
What does a P0775 code mean?
Second pressure control solenoid fault.
What causes a P0775 code?
Common causes: Failed solenoid; Wiring; Fluid contamination.
What are the symptoms of a P0775 code?
Typical symptoms: Harsh or slipping shifts.
Is it safe to drive with a P0775 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-$2,500.
How do I diagnose a P0775 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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