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Engine-Codes – Generic – P0758

P0758 Code - Shift Solenoid 'B' Electrical

Quick Answer

The P0758 diagnostic trouble code refers to an issue with the Shift Solenoid 'B' in the vehicle's transmission system. Common causes include Faulty shift solenoid 'B', Damaged wiring or connectors related to the solenoid, Low transmission fluid levels 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
P0758 indicates Shift Solenoid 'B' Electrical.
Common causes
Common causes include Faulty shift solenoid 'B', Damaged wiring or connectors related to the solenoid, Low transmission fluid levels 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 Sep 07, 2024
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Code P0758 Description

The P0758 diagnostic trouble code refers to an issue with the Shift Solenoid 'B' in the vehicle's transmission system. The shift solenoid is responsible for controlling the flow of transmission fluid, which in turn controls the shifting of gears within the transmission. In the case of P0758, the code indicates that there is an electrical fault with the solenoid, meaning that the power supply or communication to the solenoid is compromised.

OBDII Code P0758 - Shift Solenoid 'B' Electrical
P0758 Code - Shift Solenoid 'B' Electrical

Common Causes of P0758

  1. Faulty shift solenoid 'B'
  2. Damaged wiring or connectors related to the solenoid
  3. Low transmission fluid levels or contaminated fluid
  4. Issues with the transmission control module (TCM)
  5. Electrical problems within the transmission system

Symptoms of P0758

  1. Erratic or harsh shifting between gears
  2. Delayed or inconsistent shifting patterns
  3. Transmission slipping
  4. Illuminated check engine light
  5. Decreased fuel efficiency

How to Fix P0758

  1. Begin by conducting a thorough diagnostic scan to confirm the P0758 code and identify the specific cause of the issue.
  2. Inspect the shift solenoid 'B' and its wiring for any signs of damage or corrosion. Replace the solenoid if necessary.
  3. Check the transmission fluid level and quality. If low or contaminated, perform a fluid flush and refill.
  4. Test the transmission control module (TCM) for proper operation and communication with the solenoid. Replace or reprogram the TCM as needed.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0758

The typical repair costs for addressing the Shift Solenoid 'B' electrical issue can vary depending on the specific cause of the problem and the vehicle's make and model. On average, the parts for a shift solenoid replacement can range from $150 to $300, while labor costs can range from $100 to $200. This brings the total repair cost to approximately $250 to $500.

When is the Code Detected?

The P0758 code is detected when the gear required by the ECM does not match the actual gear when vehicle is driven.

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Code P0758 Information for Specific Makes

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 P0758 Code

No Frequently Asked Questions about P0758 Code found.

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  • When Eng. is cold transmission shifts normal, after a while running I lost over drive and first in automatic had to shift manually to move from a stop position , only second and third gear was working ,I hook up a diagnostic computer and code p0758 pop up.

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  • When driving my g6 it goes to shift into 4th and then it acts like it's in neutral. From reverse to drive it shifts hard and it doesn't always happen. Wtf, somebody help pls

    Reply to Comment

  • Start by checking the transmission fluid level and condition. Add fluid if necessary. If fluid level looks very dark and smells burnt, then you need to have a transmission specialist inspect the transmission, you could have a bad transmission.

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  • How do you put power to shift sensor throw harness

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    • The shift solenoid isn’t something you normally power up directly through the harness. It’s controlled by the transmission control module (or PCM), which sends voltage and ground signals based on gear selection and driving conditions.

      If you’re trying to test the solenoid, the safer way is to use a wiring diagram and a multimeter. You can check for proper voltage from the PCM connector with the key on, or measure resistance of the solenoid through the transmission connector. Applying power directly can damage the solenoid or PCM if polarity or voltage is wrong.

      If you suspect the solenoid is bad, it’s better to confirm by checking resistance specs and continuity through the harness rather than powering it manually.

      Reply to Comment