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AutoCodes – Generic – P0766

P0766 Code - Shift Solenoid 'D' Performance or Stuck Off

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 indicates Shift Solenoid 'D' Performance or Stuck Off.
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 57,053
How popular is this code, among other codes? Medium
What is this?
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code P0766 Description

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). Gears will then be shifted to the optimum position.
OBDII Code P0766 - Shift Solenoid 'D' Performance or Stuck Off - AutoCodes.com
P0766 Code - Shift Solenoid 'D' Performance or Stuck Off
What does this mean?

What are the Possible Causes of the DTC P0766?

  • 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?

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 does this mean?

Code Tech Notes

When the a transmission solenoid is stuck off, 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0766 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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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 P0766 Code

No Frequently Asked Questions about P0766 Code found.

Discuss the causes and fixes for P0766 OBDII Code

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  • Replaced a and b selonoids on2007 mercury Milan still didn't help code po757 b stuck on plus d performance stuck off where to next change all selonoids are try a new tranny

    Reply to Comment

  • More than likely you have to rebuild the solenoids. How was the transmission fluid condition? did smell burnt?

    Reply to Comment
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