AutoCodes – Lexus – P0766 Lexus

P0766 Lexus Code - Shift Solenoid 'D' Performance

Quick Answer

Shift solenoid valve 'D' is turned ON or OFF by the Transmission Control Module (TCM) in response to signals sent from the park/neutral position (PNP) switch, vehicle speed and Engine Control Module (ECM) (throttle opening). Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty shift solenoid 'D' valve. 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 Lexus indicates Shift Solenoid 'D' Performance.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty shift solenoid 'D' valve.
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.

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Code Popularity 11,477

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0766 Lexus Description

OBDII Code P0766 Lexus - Shift Solenoid 'D' Performance - AutoCodes.com — P0766 Lexus Code - Shift Solenoid 'D' Performance

What does this mean?

What are the Possible Causes of the DTC P0766 Lexus?

Low transmission fluid level
Dirty transmission fluid
Faulty shift solenoid 'D' valve
Shift solenoid 'D' valve harness or connectors
Shift solenoid 'D' valve circuit is open or shorted

How to Fix the DTC P0766 Lexus?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0766 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 P0766 Lexus Code

1. What are the common symptoms of OBDII code P0766 in a Lexus related to Shift Solenoid 'D' Performance?

Symptoms may include harsh shifting, delayed shifting, transmission slippage, and potential stalling or inability to shift gears.

2. What are some possible causes of OBDII code P0766 in a Lexus?

Common causes include a faulty shift solenoid 'D', low transmission fluid level, dirty or contaminated transmission fluid, electrical issues, or a damaged wiring harness.

3. How serious is OBDII code P0766 in a Lexus?

While the vehicle may still be operable with this code, ignoring it can lead to further damage to the transmission over time. It is recommended to address the issue promptly to prevent more severe problems.

4. Can I drive my Lexus with OBDII code P0766?

It is generally not recommended to drive the vehicle with this code present, as it can lead to transmission issues and potential safety hazards. It's best to have the problem diagnosed and repaired before continuing to drive the vehicle.

5. How can I diagnose OBDII code P0766 in my Lexus?

Diagnosis typically involves using a scan tool to read the code, checking the transmission fluid level and condition, inspecting the shift solenoid 'D', and testing the electrical connections related to the solenoid.

6. What are some repair tips for fixing OBDII code P0766 in a Lexus?

Repair tips may include replacing the faulty shift solenoid 'D', performing a transmission fluid flush and filter replacement, checking and repairing any damaged wiring, and ensuring proper electrical connections.

7. Can a DIY enthusiast fix OBDII code P0766 in a Lexus?

While some experienced DIY enthusiasts may be able to address this issue, it is recommended to seek professional help for transmission-related problems due to the complexity and critical nature of the transmission system.

8. How much does it typically cost to repair OBDII code P0766 in a Lexus?

The cost of repair can vary depending on the exact cause of the issue, labor rates, and parts needed. It is advisable to get a diagnosis from a qualified mechanic to determine the specific cost for your situation.

9. Will resetting the OBDII code P0766 in my Lexus make the problem go away?

Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the code. It is important to diagnose and repair the problem to prevent further transmission damage.

10. How can I prevent OBDII code P0766 from occurring in my Lexus in the future?

Regular maintenance, such as changing the transmission fluid and filter according to the manufacturer's recommendations, can help prevent issues like shift solenoid failures that can trigger this code.