P0775 Pressure control solenoid B malfunction

Pressure control solenoid B fault

P0775 in short

P0775 means the transmission computer found a problem with pressure control solenoid B, which helps set the fluid pressure that applies the clutches. Harsh shifts, shudder or slipping can follow. Fluid, the solenoid, wiring and internal leaks such as a worn servo bore are common causes. Have it inspected soon.

Pressure control solenoids let the computer adjust the fluid pressure used to apply clutches and bands. P0775 is a general fault for solenoid B: the computer saw that the solenoid or the pressure it controls is not behaving as expected.

Owners of 2002–2003 Ford Explorers often report P0775 with shudder and lost gears, and some link it to a leaking servo bore. Toyota lists a P0775 variant on 2017–2018 Highlanders and Siennas with harsh shifts.

Most likely causes

These are general causes for this code across vehicles. None is specific to one make or model.

  1. Low or dirty fluid, clogged filter

    Common general cause
    Why it ranks here
    Fluid and filter problems are the first causes listed by code references.
    What would change this
    Rises if the fluid is low or burnt.

  2. Faulty pressure control solenoid B

    Common general cause
    Why it ranks here
    The solenoid is listed as a cause.
    What would change this
    Rises if the solenoid fails a command or resistance test.

  3. Wiring or connector fault

    Common general cause
    Why it ranks here
    Wiring is a listed cause.
    What would change this
    Rises if the circuit is open or shorted.

  4. Internal leak, valve body or servo wear (e.g. 2002–2003 Ford Explorer)

    Possible — needs testing
    Why it ranks here
    Code references list the valve body and servo, and Explorer owners report P0775 with a leaking servo bore. No bulletin in our data confirms this.
    What would change this
    Rises on a 2002–2003 Explorer that shudders or loses 2nd or 5th gear.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read codes from the engine and transmission modules with a scan tool that supports both, before anything is cleared.

    Low riskTool: scan tool that reads the transmission module

    • IfSeveral solenoid or ratio codes are stored

      It meansLook for wiring, power or an internal leak.

      Go to step 2

    • IfP0775 alone

      It meansLook for a bulletin.

      Go to step 2

  2. Check for a P0775 bulletin for your VIN at a dealer or on the NHTSA site.

    Low risk

  3. Have a shop check the fluid, command solenoid B with a scan tool and, if needed, test line pressure.

    Best left to a shopTool: scan tool with transmission data and output controls

    Warning:Shop test. Pressure testing needs gauges and the maker's specifications.

Symptoms

  • Check engine light or blinking O/D off light
  • Harsh shifts or shudder
  • Slipping or lost gears
  • Stuck in one gear or limp-home mode Gets more serious: stop and have it checked.

How to fix

  1. Do not clear the code before the transmission module has been read; the stored data helps the shop.

  2. Check the transmission fluid level and condition if your transmission has a dipstick or the owner's manual describes a check, and look for leaks under the car.

  3. Ask a dealer whether your VIN has an open P0775 bulletin or software update.

On your vehicle

Toyota

  • 2017–2018 · Highlander

    Supported by vehicle data

    Toyota T-SB-0160-18 lists a P0775 variant (P07757F) with whine or harsh shifts (also Sienna). The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • T-SB-0160-18Status unverified

    Whine, harsh shift, MIL or reduced power

    2017–2018highlander, sienna · issued · NHTSA 10153235

    DTCs listed include P07757F and other transmission codes. Only the NHTSA flat-file summary was read, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Ford

  • 2002–2003 · Explorer

    Supported by vehicle data

    Owners report P0775 with shudder and lost gears, some linking it to a leaking servo bore, per complaints to NHTSA. These are owner reports, not a bulletin.

  • P0735Gear 5 incorrect ratio

    Shares causes Possible — needs testing

    A 2002 Explorer owner reported P0775 and P0735 together.

  • P0700Transmission module requests the check engine light

    Primary / secondary Possible — needs testing

    Likely primary: P0775. On cars with a separate transmission module a basic reader may show only P0700; P0775 can be the module's own code.

All Transmission codes

Sources and review

  1. Toyota Camry Owner's Manual (OM06291U) — Toyota
  2. P0775 OBD-II Trouble Code: Pressure Control Solenoid B Malfunction — Kelley Blue Book
  3. Cal. Code Regs. Tit. 13, § 1968.2 — Malfunction and Diagnostic System Requirements (OBD II) — California Air Resources Board (via Cornell LII)
  4. Toyota T-SB-0160-18: Highlander/Sienna whine, harsh shift, MIL — Toyota Motor North America ,
  5. NHTSA complaint 10807648: 2002 Ford Explorer, P0775 — NHTSA Office of Defects Investigation
  6. NHTSA complaint 10317785: 2002 Ford Explorer, P0775 — NHTSA Office of Defects Investigation
Last reviewed
Written by
Saurabh K.
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