P0755: Shift Solenoid B Malfunction
14 vehicles · 7 makes · $100-$4,500 repair
Most Reported On
P0755 is an OBD-II diagnostic trouble code meaning “Shift Solenoid B Malfunction.” This code means the transmission control module commanded shift solenoid 'B' but did not see the expected electrical response, indicating an electrical fault in that solenoid or its circuit. Shift solenoids are small electrically-operated valves inside the automatic transmission that route pressurized fluid to engage the correct gears at the right time. When the computer detects an open, short, or out-of-range signal on solenoid B's circuit, it flags this code. You may notice harsh or wrong-gear shifts, the transmission stuck in one gear, or 'limp' mode. This code is most commonly reported on 1996-2003 Ford Windstar, 1998-2011 Ford Crown Victoria, and 2018-2022 Ford EcoSport, plus 11 other vehicles, with repair costs ranging from $100 to $4,500.
Common Causes
Typical Repair Cost
Based on 14 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0755, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (14)
AX4S/AX4N Automatic Transmission Failure
4R70W/4R75W Transmission Shift Solenoid Pack Failure
Rough and Jerky Transmission Shifting
6F35 Transmission Harsh Shifting and Shudder
FAQ
What does P0755 mean?
P0755 stands for "Shift Solenoid B Malfunction." This code means the transmission control module commanded shift solenoid 'B' but did not see the expected electrical response, indicating an electrical fault in that solenoid or its circuit. Shift solenoids are small electrically-operated valves inside the automatic transmission that route pressurized fluid to engage the correct gears at the right time. When the computer detects an open, short, or out-of-range signal on solenoid B's circuit, it flags this code. You may notice harsh or wrong-gear shifts, the transmission stuck in one gear, or 'limp' mode.
What are the most common causes of P0755?
The most common causes of P0755 are: Failed or stuck shift solenoid B, Damaged, shorted, or corroded solenoid wiring/connector, Low or dirty/contaminated transmission fluid, Clogged transmission filter or fluid passages, Valve body wear or internal hydraulic fault, Faulty transmission control module (TCM), Internal transmission mechanical wear. The specific cause varies by vehicle.
How much does it cost to fix P0755?
Repair costs for P0755 range from $100 to $4,500, depending on the vehicle and root cause.
Which vehicles are affected by P0755?
Au7o has documented P0755 across 14 vehicle models from 7 manufacturers: Chrysler, Dodge, Ford, Kia, Mazda, Toyota, Volvo.
Sources (11)
- mediaFord AX4S Transmission Problem - AA1Car
- mediaFord Windstar Transmission Problems & Overview - TransmissionRepairCostGuide
- mediaFord Automatic 4 speed - Center for Auto Safety
- ForumAX4S Transmission Problem - Taurus Car Club
- videoYouTube - How to Replace 4R70W Transmission Shift Solenoid Pack - EricTheCarGuy
- owner-reportFord EcoSport Transmission Problems — EcoSport Forum
- owner-reportFord EcoSport Common Problems — Engine Patrol
- videoEricTheCarGuy - Volvo AW55-50 Transmission Solenoid Replacement
- videoVolvo AW50-42 Transmission Rebuild - EricTheCarGuy
- TSBToyota Warranty Enhancement Program ZE7 / ECM Coverage for 2005 and Earlier Corolla/Matrix
- videoYouTube: A604 41TE Transmission Solenoid Pack Replacement - ChrisFix
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.