P0755 Shift solenoid B circuit or operation fault

Shift solenoid B

P0755 in short

P0755 means the transmission computer has found a fault with shift solenoid B, one of the valves that changes gears. The solenoid, its wiring, or low or dirty fluid are common causes, and Toyota, Hyundai and Ram have bulletins. Have it inspected soon, because the transmission may stick in one gear.

Shift solenoids are electric valves inside the transmission that route fluid to apply clutches and bands. The computer switches them on and off to change gears. P0755 sets when solenoid B's circuit is open, shorted or does not produce the expected gear.

Which gears solenoid B controls depends on the transmission, so symptoms vary: harsh or delayed shifts, no upshift, or a backup mode that holds one gear. Some makers label the solenoid differently; Ram calls it the 2C solenoid in one bulletin.

Toyota ran a service campaign on 2001–2003 RAV4s for harsh shifts with P0755 and related solenoid codes, and Hyundai has a bulletin covering many solenoid codes on older models. Checking fluid level and condition, then the bulletins, comes before replacing parts.

Most likely causes

  1. Known automatic transaxle condition (2001–2003 Toyota RAV4)

    Supported by vehicle data
    Why it ranks here
    Toyota issued a bulletin and a service campaign for harsh shifts and the MIL with P0750, P0753, P0755, P0758 or P1760 on these RAV4s.
    What would change this
    Rises on a 2001–2003 RAV4 with harsh shifts, especially if the campaign has not been done.

  2. Faulty shift solenoid B

    Common general cause
    Why it ranks here
    The solenoid itself is a standard cause, and Hyundai lists P0755 among solenoid codes from incorrect solenoid operation.
    What would change this
    Rises if the solenoid's resistance is out of spec or it does not click when commanded.

  3. Damaged wiring or connector to the solenoid

    Common general cause
    Why it ranks here
    Wiring and connector faults are listed causes, and connector corrosion and pinched wires are checked first on any transmission circuit.
    What would change this
    Rises if the code is intermittent or the circuit reads open or shorted at the module.

  4. Low or dirty transmission fluid

    Common general cause
    Why it ranks here
    Low or dirty fluid is a listed cause, and the wrong fluid can cause shift shudder and shock.
    What would change this
    Rises if the level is low or the fluid is dark or burnt-smelling.

  5. Solenoid circuit condition covered by a Ram bulletin (2019–2022 Ram 2500/3500)

    Supported by vehicle data
    Why it ranks here
    Ram has a bulletin for the MIL with P0755 (2C solenoid circuit), P0765 and/or P0871 on these trucks.
    What would change this
    Rises on a 2019–2022 Ram HD with P0765 or P0871 also stored.

  6. Valve body or pump problem

    Possible — needs testing
    Why it ranks here
    Listed as a less common cause; the valve body holds the solenoids and the pump supplies the pressure they route.
    What would change this
    Rises if the solenoid and wiring test good but the shift fault remains.

What to test first

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

  1. Check the transmission fluid level and condition using the method in the owner's manual.

    Use cautionTool: none, or a dipstick if fitted

    Warning:Many transmissions are checked hot with the engine running. Keep hands clear of the fan and belts, and if there is no dipstick leave it to a shop.

  2. Check for open campaigns and P0755 bulletins for your VIN at a dealer or on the NHTSA site.

    Low risk

  3. Have a shop command the solenoid with a scan tool and check its circuit and resistance.

    Best left to a shopTool: scan tool with output controls, multimeter

    Warning:Shop test. Circuit checks follow the maker's wiring diagram, and solenoids are often inside the transmission.

Symptoms

  • Check engine light
  • Delayed, harsh or erratic shifts
  • Transmission stuck in one gear Gets more serious: stop and have it checked.
  • Reduced power or limp-home mode Gets more serious: stop and have it checked.

How to fix

  1. Check the fluid level and condition first; top up only with the fluid the owner's manual specifies.

  2. Ask a dealer whether your VIN has an open campaign or P0755 bulletin. Toyota, Hyundai and Ram have issued them.

Parts and cost context

  • Transmission control module (TCM):Do not replace the transmission computer for P0755 unless the solenoid and wiring test good and a test points to the module.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Toyota

  • 2001–2003 · RAV4

    Supported by vehicle data

    Toyota TSB-0156-10 and service campaign TC-10-034 cover harsh shifts and the MIL with P0755 and related solenoid codes; most P0755 owner complaints are from these RAV4s. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • TSB-0156-10Status unverified

    Harsh shift and/or MIL with P0750, P0753, P0755, P0758 and/or P1760

    2001–2003rav4 · issued · NHTSA 10034126

    Some 2001–2003 RAV4s with an automatic transaxle may shift harshly and/or show the MIL with these codes. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

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

  • TC-10-034Status unverified

    Service campaign: MIL on and/or harsh shift on certain RAV4 automatics

    2001–2003rav4 · issued · NHTSA 10034070

    Toyota service campaign for certain 2001–2003 RAV4s with the MIL on and/or harsh shifts. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

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

Hyundai

  • 1999–2010

    Supported by vehicle data

    Hyundai TSB 09-AT-018 covers transaxle solenoid codes including P0755 on many older models. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • TSB-09-AT-018Status unverified

    Automatic transaxle solenoid codes including P0755

    1999–2010azera, elantra, santa-fe, sonata, tiburon, tucson · issued · NHTSA 10032908

    Incorrect transaxle solenoid operation can light the check engine light with codes including P0740, P0741, P0746, P0750 and P0755. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

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

Ram

  • 2019–2022 · 2500

    Supported by vehicle data

    Ram S2121000008 covers the MIL with P0755 (2C solenoid circuit), P0765 and/or P0871; the 3500 is also covered. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • S2121000008RevCStatus unverified

    MIL with P0765, P0871 and/or P0755 (2C solenoid circuit)

    2019–20222500, 3500 · issued · NHTSA 10221399

    Covers the MIL with P0765 UD solenoid circuit, P0871 pressure switch C performance and/or P0755 2C solenoid circuit. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

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

  • P0746Pressure control solenoid A is not working or stuck off

    Same system Possible — needs testing

    P0746 is a pressure control solenoid fault; Hyundai lists it with P0755 among solenoid codes from incorrect solenoid operation.

  • P0741Torque converter clutch not engaging as commanded

    Same system Possible — needs testing

    P0741 is a torque converter clutch fault; Hyundai's solenoid bulletin covers it too.

All Transmission codes

Sources and review

  1. P0755 — Shift Solenoid "B" — Kelley Blue Book
  2. Cal. Code Regs. Tit. 13, § 1968.2 — Malfunction and Diagnostic System Requirements (OBD II) — California Air Resources Board (via Cornell LII)
  3. Toyota TSB-0156-10: harsh shift and/or MIL with DTC P0750, P0753, P0755, P0758 and/or P1760 — Toyota Motor Sales ,
  4. Toyota service campaign TC-10-034: MIL on and/or harsh shift on certain RAV4 automatic transaxles — Toyota Motor Sales ,
  5. Hyundai TSB 09-AT-018: automatic transaxle solenoid DTCs including P0755 — Hyundai Motor America ,
  6. Tranny Problems: On the Outside Looking In — MOTOR Magazine ,
  7. Ram S2121000008 Rev C: MIL with P0765 UD solenoid, P0871 pressure switch C and/or P0755 2C solenoid circuit — FCA US ,
Last reviewed
Written by
Saurabh K.
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