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P0755 Mitsubishi Code - Shift Solenoid 'B' Malfunction

Quick Answer

The P0755 diagnostic trouble code (DTC) for Mitsubishi vehicles indicates a malfunction in Shift Solenoid 'B'. Common causes include Faulty shift solenoid 'B', Wiring or connection issues with the solenoid circuit, Low transmission fluid level or contaminated fluid. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0755 Mitsubishi indicates Shift Solenoid 'B' Malfunction.
Common causes
Common causes include Faulty shift solenoid 'B', Wiring or connection issues with the solenoid circuit, Low transmission fluid level or contaminated fluid.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P0755 Mitsubishi Description

The P0755 diagnostic trouble code (DTC) for Mitsubishi vehicles indicates a malfunction in Shift Solenoid 'B'. Shift solenoids are vital components in automatic transmissions that control the flow of transmission fluid to engage specific gears. In this case, Shift Solenoid 'B' is responsible for shifting the transmission into second or third gear. When this solenoid malfunctions, it can lead to issues with gear shifting, causing the vehicle to experience problems with acceleration, shifting, and overall performance. Ignoring this issue can lead to further damage to the transmission system and potentially result in costly repairs down the line.

OBDII Code P0755 Mitsubishi - Shift Solenoid 'B' Malfunction
P0755 Mitsubishi Code - Shift Solenoid 'B' Malfunction

Common Causes of P0755 Mitsubishi

  1. Faulty shift solenoid 'B'
  2. Wiring or connection issues with the solenoid circuit
  3. Low transmission fluid level or contaminated fluid
  4. Mechanical damage to the transmission
  5. Electronic control module (ECM) failure

Symptoms of P0755 Mitsubishi

  1. Delayed or harsh shifting between gears
  2. Transmission slipping or failing to shift into the correct gear
  3. Engine stalling when coming to a stop
  4. Decreased fuel efficiency
  5. Illumination of the Check Engine Light

How to Fix P0755 Mitsubishi

  1. Perform a diagnostic scan to confirm the P0755 code and pinpoint the exact cause of the issue.
  2. Inspect the shift solenoid 'B' and its associated wiring for any signs of damage or corrosion.
  3. Replace the faulty shift solenoid 'B' if necessary, ensuring proper installation and connection.
  4. Check and top off the transmission fluid level, flush the system if fluid is contaminated.
  5. Clear the DTC from the vehicle's ECM and test drive the vehicle to ensure proper operation of the transmission.

Cost to Fix P0755 Mitsubishi

The cost of repairing a Shift Solenoid 'B' malfunction can vary depending on the extent of the issue and the specific repairs needed. On average, the cost for replacing a shift solenoid ranges from $150 to $400, including parts and labor. However, additional costs may apply if there are other underlying issues with the transmission system. It is recommended to consult with a professional mechanic or auto repair shop for a more accurate estimate based on the specific vehicle make and model.

What does this mean?

Tech Notes for P0755 Mitsubishi

When the a transmission solenoid is malfunction, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.

When is the Code Detected?

The P0755 code is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0755 Mitsubishi Code

1. What are the common symptoms of OBDII code P0755 in a Mitsubishi, indicating a Shift Solenoid 'B' Malfunction?

- Common symptoms include harsh shifting, delayed or erratic shifting, transmission slipping, and the transmission getting stuck in a particular gear.

2. What are the possible causes of the Shift Solenoid 'B' Malfunction (P0755) in a Mitsubishi?

- The typical causes include a faulty shift solenoid 'B', damaged wiring or connectors related to the solenoid, low transmission fluid levels, or internal transmission issues.

3. How serious is OBDII code P0755 in a Mitsubishi, indicating a Shift Solenoid 'B' Malfunction?

- Ignoring this code can lead to further damage to the transmission system, potentially resulting in more expensive repairs. It is advisable to address this issue promptly.

4. Can I continue to drive my Mitsubishi with OBDII code P0755 (Shift Solenoid 'B' Malfunction)?

- It is not recommended to continue driving the vehicle with this code present, as it can cause further damage to the transmission. It's best to address the issue as soon as possible.

5. How can I diagnose and repair OBDII code P0755 in my Mitsubishi related to the Shift Solenoid 'B' Malfunction?

- Diagnosis typically involves checking the shift solenoid 'B' for proper operation, inspecting the wiring and connectors for damage, and ensuring the transmission fluid level is adequate. Repair often involves replacing the faulty solenoid or repairing the wiring/connectors.

6. Is it possible to reset the OBDII code P0755 in my Mitsubishi without fixing the underlying issue?

- While clearing the code may temporarily turn off the check engine light, the issue causing the code will persist. It is crucial to address the root cause of the problem to prevent further transmission damage.

7. How much does it cost to repair OBDII code P0755 in a Mitsubishi caused by a Shift Solenoid 'B' Malfunction?

- The cost of repair can vary depending on the specific problem, but it typically involves replacing the shift solenoid 'B' or repairing related wiring. Costs can range from a few hundred to over a thousand dollars, including parts and labor.

8. Are there any preventive maintenance tips to avoid OBDII code P0755 in a Mitsubishi due to a Shift Solenoid 'B' Malfunction?

- Regularly servicing the transmission, ensuring proper fluid levels and quality, and promptly addressing any transmission-related issues can help prevent the occurrence of this code.

9. Can a DIY enthusiast with basic automotive knowledge tackle the repair of OBDII code P0755 in a Mitsubishi?

- While some enthusiasts may have the skills to replace the shift solenoid 'B' or repair wiring, this repair can be complex and may require special tools. It is recommended to consult a professional mechanic for this repair.

10. How long does it typically take to repair OBDII code P0755 related to the Shift Solenoid 'B' Malfunction in a Mitsubishi?

- The repair time can vary depending on the extent of the issue and the availability of parts. Generally, it can take a few hours to a full day for a mechanic to diagnose and repair the problem.

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