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P0766 Toyota Code - Shift Solenoid 'D' Performance

Quick Answer

The P0766 diagnostic trouble code for Toyota vehicles signifies an issue with the Shift Solenoid 'D' performance. Common causes include Faulty Shift Solenoid 'D', Electrical issues such as wiring problems or a faulty transmission control module, Low transmission fluid levels. 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
P0766 Toyota indicates Shift Solenoid 'D' Performance.
Common causes
Common causes include Faulty Shift Solenoid 'D', Electrical issues such as wiring problems or a faulty transmission control module, Low transmission fluid levels.
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 10, 2024
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Code P0766 Toyota Description

The P0766 diagnostic trouble code for Toyota vehicles signifies an issue with the Shift Solenoid 'D' performance. Shift solenoids are vital components of the transmission system that control the flow of transmission fluid, ultimately facilitating gear shifting. Solenoid 'D' specifically plays a crucial role in the transmission's ability to shift gears smoothly and efficiently.

OBDII Code P0766 Toyota - Shift Solenoid 'D' Performance
P0766 Toyota Code - Shift Solenoid 'D' Performance

Common Causes of P0766 Toyota

  1. Faulty Shift Solenoid 'D'
  2. Electrical issues such as wiring problems or a faulty transmission control module
  3. Low transmission fluid levels
  4. Contaminated or dirty transmission fluid
  5. Mechanical failures within the solenoid

Symptoms of P0766 Toyota

  1. Erratic shifting patterns
  2. Delayed gear engagement
  3. Harsh shifting
  4. Transmission slipping
  5. Transmission stuck in a specific gear

How to Fix P0766 Toyota

  1. Begin by conducting a thorough diagnostic scan to confirm the P0766 code and identify the specific cause of the issue.
  2. Inspect the Shift Solenoid 'D' and surrounding components for any visible damage or signs of wear.
  3. Test the solenoid's electrical connections and wiring to ensure proper voltage and continuity.
  4. Replace the faulty Shift Solenoid 'D' if necessary, ensuring it is installed correctly and securely.
  5. Flush and refill the transmission fluid to the proper level and quality, addressing any contamination issues.

Cost to Fix P0766 Toyota

The cost estimate for addressing the Shift Solenoid 'D' performance issue can vary depending on the specific cause and the extent of the repairs needed. Typically, the replacement of a shift solenoid and related parts can range from $150 to $400, with labor costs adding another $100 to $200. Additional costs for diagnostic scans, transmission fluid flush, and any other necessary repairs should also be taken into account.

When is the Code Detected?

The P0766 code is detected when the gear required by the Engine Control Module (ECM) does not match the actual gear when driving

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Information for Specific Toyota Models

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 P0766 Toyota Code

No Frequently Asked Questions about P0766 Toyota Code found.

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  • Doesn't go in d/overdrive, shifts fine, no noise, notice Miles per gallon going from 26/27 to 23/24
    on highway. Going 70 MPH in Drive and any D/Overdrive same RPMS on Tach
     transmission fluid full, feels smooth not gritty. ? is this common, easy fix?
    anyone with same problem?

    Reply to Comment

  • What is your model and year? There is a factory service bulletin for the 2008 Tundra. See "Tech Notes" above.

    Reply to Comment