P0755: Shift Solenoid B Malfunction
Severity: high
What it means: P0755 means the computer found a problem with shift solenoid 'B', one of the electrically controlled valves inside an automatic transmission that direct fluid to change gears. It often comes with limp mode.
Safe to drive? Only gently and for a short distance. The transmission may be stuck in one gear.
Common symptoms
- Check engine light
- Stuck in one gear (limp mode)
- Slipping into neutral or harsh shifts
Likely causes, ranked
- Failed shift solenoid or solenoid packShop
- Wiring or connector shortShop
- Low or dirty transmission fluidDIY or shop
- Transmission computer faultShop
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Vehicle-specific notes
- 2008–2014 Dodge Avenger: A 2008 owner had P0700 and P0755 with limp mode in 2nd; a tech fixed the same code on another Chrysler by repairing a shorted harness. Read the full answer · Source
DIY or shop?
Checking fluid is DIY. Electrical testing and solenoid replacement are usually shop work.
Before you replace parts
- Read the codes with a scan tool that talks to the transmission computer.
- Check the transmission fluid level and condition.
- Inspect the transmission wiring harness and connectors for damage, corrosion or shorts.
- Have the solenoid resistance and circuit tested before replacing the solenoid or computer.
- Check your VIN for recalls, service bulletins and software updates.
Safety / mechanic note
Verify with a mechanic. A transmission that drops to neutral or sticks in one gear is a traffic hazard. A code points to a circuit or system, not always a specific part.
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