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P0778 Toyota Code - Pressure Control Solenoid 'B' Electrical

Quick Answer

Changing from 1st to 6th is performed by the Engine Control Module (ECM) turning shift solenoid valves SL1, SL2, SL3, SL4, and SL on and off. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Pressure Control Solenoid 'B' valve (Shift Solenoid Valve SL2). 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
P0778 Toyota indicates Pressure Control Solenoid 'B' Electrical.
Common causes
Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Pressure Control Solenoid 'B' valve (Shift Solenoid Valve SL2).
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 43,197
How popular is this code, among other codes? Medium
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2022
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Code P0778 Toyota Description

Changing from 1st to 6th is performed by the Engine Control Module (ECM) turning shift solenoid valves SL1, SL2, SL3, SL4, and SL on and off. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated.
This Diagnostic Trouble Code (DTC) indicates an open or short in the shift solenoid valve SL2 circuit. The ECM commands gear shifts by turning the shift solenoid valves on or off. When there is an open or short circuit in any of the shift solenoid valve circuits, the ECM detects the problem and illuminates the MIL, and stores the DTC. The ECM also performs the fail-safe function and turns the other normal shift solenoid valves on or off. (In case of an open or short circuit, the ECM stops sending current to the circuit.)
While driving and shifting gears, if the ECM detects an open or short in the shift solenoid valve SL2 circuit, the ECM determines there is a malfunction.
OBDII Code P0778 Toyota - Pressure Control Solenoid 'B' Electrical - AutoCodes.com
P0778 Toyota Code - Pressure Control Solenoid 'B' Electrical
What does this mean?

What are the Possible Causes of the DTC P0778 Toyota?

  • Low transmission fluid level
  • Dirty transmission fluid
  • Faulty Pressure Control Solenoid 'B' valve (Shift Solenoid Valve SL2)
  • Pressure Control Solenoid 'B' valve harness is open or shorted
  • Pressure Control Solenoid 'B' valve circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P0778 Toyota?

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 a transmission solenoid 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 dirty, it's recommended to change the transmission fluid and if possible, remove the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a mechanical transmission 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 P0778 Toyota 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 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 P0778 Toyota Code

1. What are the common symptoms of OBDII code P0778 in a Toyota related to the Pressure Control Solenoid 'B' Electrical issue?

- Common symptoms include harsh shifting, erratic transmission behavior, transmission slipping, and potential stalling.

2. What are the possible causes of the OBDII code P0778 in a Toyota?

- Common causes include a faulty pressure control solenoid 'B', damaged wiring or connectors, low transmission fluid level, or a malfunctioning transmission control module.

3. How can I diagnose the Pressure Control Solenoid 'B' Electrical issue triggering the P0778 code in my Toyota?

- A proper diagnostic procedure involves checking the transmission fluid level and condition, inspecting the wiring and connectors for damage, and testing the pressure control solenoid 'B' for proper functionality.

4. Can I continue driving my Toyota with the P0778 code present?

- It is not recommended to drive your vehicle with the P0778 code active, as it can lead to further transmission damage and unsafe driving conditions.

5. How can I repair the Pressure Control Solenoid 'B' Electrical issue in my Toyota?

- Repair options include replacing the faulty pressure control solenoid 'B', repairing any damaged wiring or connectors, ensuring the transmission fluid is at the correct level, and resetting the trouble code.

6. Is it possible to reset the OBDII code P0778 in a Toyota without addressing the underlying issue?

- While you can clear the code using an OBDII scanner, the underlying issue causing the code will persist unless properly diagnosed and repaired.

7. Can a DIY enthusiast fix the P0778 code related to the Pressure Control Solenoid 'B' Electrical issue in a Toyota?

- Depending on your skill level and access to tools, you may be able to replace the pressure control solenoid 'B' yourself. However, proper diagnosis and repair are crucial for a successful fix.

8. How much does it typically cost to repair the Pressure Control Solenoid 'B' Electrical issue causing the P0778 code in a Toyota?

- Repair costs can vary depending on the extent of the issue and whether you choose to address it yourself or take it to a professional mechanic. Costs may range from $200 to $500 or more.

9. Will the P0778 code disappear on its own in a Toyota, or does it require immediate attention?

- The P0778 code will not disappear on its own and should be addressed promptly to prevent further transmission damage and potential safety hazards.

10. Can a malfunctioning Pressure Control Solenoid 'B' impact the overall performance of my Toyota's transmission?

- Yes, a faulty pressure control solenoid 'B' can cause shifting problems, erratic transmission behavior, and potential damage to other transmission components if left unresolved.

Discuss the causes and fixes for P0778 Toyota OBDII Code

Submit a New Comment

  • I replaced the transmission fluid with Toyota recommended specs(4 quarts). And there were no visible metal shavings. Before that I took care of DTC P0776 by replacing the problem solenoids SL2(2). Now why am I getting this code? This is ridiculous.

    Reply to Comment
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