Error Code P0755: What It Means & What To Do?

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P0755 is a diagnostic trouble code (DTC) for "Shift Solenoid B Malfunction”. It indicates that PCM has detected an irregularity in shift solenoid B. Note that this only applies to automatic transmissions. This trouble code is a sign that there is something wrong with your transmission. It is essential to have it diagnosed and repaired before further damage is done.

OBD-II trouble code P0755 is associated with a general malfunction with the transmission Shift Solenoid "B" Circuit. Most automatic transmissions incorporate at least three solenoids that are solenoid A, B and C wherein trouble code P0755 is associated with shift solenoid B. The transmission solenoids are responsible for opening or closing valves in the valve body to allow transmission fluid to flow to the clutches and bands to shift the transmission smoothly as the engine accelerates. P0755 code indicates that the transmission shift solenoid B has experienced a malfunction, and the computer has detected it.

What causes this problem with the Shift Solenoid B Malfunction?

• Polluted transmission fluid
• Insufficient level of transmission fluid
• Faulty shift solenoid B
• Clogged hydraulic passages
• Internal transmission failure
• Fallacious wiring and connectors
• Failed PCM

1. Shift Solenoid - A shift solenoid is a required part of a functioning transmission, shift solenoids job is as it sounds, shifts the gears for you. A faulty shift solenoid can prevent fluid pressure from activating the appropriate gear. As a result, the transmission may not shift gears or it may get stuck in neutral. Ensure its proper functioning and if you discover it faulty replace it.
2. Shift Valves - Shift valves supply hydraulic pressure to the clutches and bands to engage each gear. The valve body of the transmission contains several shift valves. The shift valve determines when to shift from one gear to the next. Faulty shift valves can also be the reason causing this error code.
3. Transmission Filter - Clogged transmission filter restricts the flow of transmission fluid to go through from it. It should be replaced immediately if found clogged so that your vehicle can continue to drive at its optimal potential.
4. Transmission Valve Body - The transmission valve body is the top control area of the transmission. This valve body is responsible for directing hydraulic fluid (or transmission fluid) to various valves so the appropriate clutch can be activated. After this happens, you are able to shift the gear to whatever one you need for your particular driving situation. If it is faulty then create drivability issues.
5. Powertrain Control Module - The Powertrain Control Module PCM is an on-board electronic control unit that primarily controls the charging, emission and transmission systems of the vehicle. It works in conjunction with a network of sensors, using their inputs to control the functioning of the engine and powertrain. Repair or replace the faulty components of PCM to ensure the smooth functioning of your vehicle.

To identify any trouble code, one should be aware of the symptoms of that particular error code. Below are the common symptoms of error code P0755, which may help you to identify this error code:

• Fall in fuel efficiency
• Failure of the transmission to shift from any gear
• Transmission controller may enter into limp mode
• Other shift solenoid related codes may store as well
• Slippage of transmission
• Overheating of transmission
• Illuminated check engine light

Trouble code P0755 is very serious as it could lead to transmission damage so it needs to be addressed on priority. The most common repair for the P0755 code is replacement of the shift solenoid circuit. However, other repairs may include:

• Changing the fluid and filter
• Repair or replace a faulty shift solenoid
• Repair or replace defective transmission valve body
• Cleaning corrosion from connectors
• Repairing or replacing wiring
• Flashing or replacing PCM

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The step by step analysis and diagnosis is recommended by a qualified technician using high grade diagnostic tools to check for all the problems and solving them.

• Begin any transmission diagnosis with an inspection of the transmission fluid dipstick (if equipped).
• Make sure that the fluid level is within manufacturer’s specified recommendations and that the fluid is in good condition.
• Visually inspect all internal wiring and connectors, look for shorted or burned wiring and replace circuitry and connectors as required.
• If the system wiring, connectors, and components appear to be in normal working order, connect the scanner to the diagnostic connector and record all stored trouble codes and freeze frame data.
• If the transmission fluid appears to be in decent shape, but the fluid level is low, add enough fluid to locate a leak and repair it.
• If either the reference voltage or ground circuits are open, use the digital volt/ohmmeter to check for continuity (disconnect all related control modules from the circuit before checking circuit resistance or controller damage may occur) and resistance in all circuits.
• Repair or replace system circuitry, connectors, and/or components that fail to coincide with manufacturer’s specs.
• Always retest the system to ensure a successful repair. If all system circuits are intact connecting the scanner to the diagnostic connector and attempt to manually activate the shift solenoid/s in question.
• If the shift solenoid functions properly and all circuits coincide with manufacturer’s specifications, suspect a defective PCM.
• Remember that PCM failure is rare and replacement will require reprogramming.

 Common Mistakes When Diagnosing the P0755 Code

Technicians report that more frequently than not, faulty shift solenoid circuit malfunctions cause this code, and shift solenoid malfunctions are diagnosed and replaced in error.

P0750 - Shift Solenoid A Malfunction

P0755 - Shift Solenoid B Malfunction

P075A - Shift Solenoid G Malfunction

P0760 - Shift Solenoid C Malfunction

P0765 - Shift Solenoid D Malfunction

P076A - Shift Solenoid H Malfunction

P0770 - Shift Solenoid E Malfunction