AutoCodes – Nissan – P0778 Nissan

P0778 Nissan Code - Pressure Control Solenoid 'B' Circuit

Quick Answer

The Pressure Control (PC) Solenoid Valve an electronic pressure regulator that controls transmission line pressure based on current flow through its coil windings. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty line pressure solenoid 'B' 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: P0778 Nissan indicates Pressure Control Solenoid 'B' Circuit.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty line pressure solenoid 'B' 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 35,306

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 Jan 30, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0778 Nissan Description

The Pressure Control (PC) Solenoid Valve an electronic pressure regulator that controls transmission line pressure based on current flow through its coil windings. As current flow is increased, the magnetic field produced by the coil moves the solenoid’s plunger further away from the exhaust port. Opening the exhaust port decreases the output fluid pressure regulated by the PC solenoid valve, which ultimately decreases line pressure. The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM).

OBDII Code P0778 Nissan - Pressure Control Solenoid 'B' Circuit - AutoCodes.com — P0778 Nissan Code - Pressure Control Solenoid 'B' Circuit

What does this mean?

What are the Possible Causes of the DTC P0778 Nissan?

Low transmission fluid level
Dirty transmission fluid
Faulty line pressure solenoid 'B' valve
Line pressure solenoid 'B' valve harness is open or shorted
Line pressure solenoid 'B' valve circuit poor electrical connection

How to Fix the DTC P0778 Nissan?

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 is malfunctioned, 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 removing 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 Nissan 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 P0778 Nissan Code

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

- Common symptoms include harsh shifting, transmission slippage, decreased fuel efficiency, and the transmission not shifting out of a particular gear.

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

- The code may be triggered by issues such as a faulty pressure control solenoid 'B,' low transmission fluid levels, a malfunctioning transmission control module (TCM), or wiring/connectivity problems.

3. How can I diagnose the Pressure Control Solenoid 'B' Circuit issue in my Nissan with OBDII code P0778?

- Diagnosis typically involves using a scan tool to retrieve the specific code, checking the transmission fluid level and condition, inspecting the wiring/connectors for damage, and testing the pressure control solenoid 'B' for proper function.

4. Can I continue driving my Nissan with OBDII code P0778 present?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the transmission and potentially result in more costly repairs.

5. How can I repair OBDII code P0778 in my Nissan related to the Pressure Control Solenoid 'B' Circuit?

- Repair options may include replacing the pressure control solenoid 'B,' addressing any transmission fluid issues, repairing or replacing damaged wiring/connectors, or resetting the TCM if necessary.

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

- While you can clear the code with a scan tool, it is not recommended to do so without addressing the root cause, as the problem may persist and potentially cause further damage.

7. What are some preventive maintenance tips to avoid OBDII code P0778 in a Nissan?

- Regularly checking and maintaining proper transmission fluid levels, addressing any leaks promptly, and following the manufacturer's recommended service intervals can help prevent issues like P0778.

8. Can a DIY enthusiast troubleshoot and repair OBDII code P0778 in a Nissan?

- While some basic diagnostics like checking fluid levels can be done by DIY enthusiasts, diagnosing and repairing the pressure control solenoid 'B' circuit issue may require specialized tools and expertise best handled by a professional mechanic.

9. How long does it typically take to repair OBDII code P0778 in a Nissan at a professional repair shop?

- The repair time can vary depending on the exact cause of the issue, but it may take a few hours to a full day to diagnose and repair the Pressure Control Solenoid 'B' Circuit problem in a Nissan.

10. Is OBDII code P0778 specific to Nissan vehicles, or can it occur in other makes and models?

- While the specific code P0778 relates to the Pressure Control Solenoid 'B' Circuit in Nissan vehicles, similar issues with pressure control solenoids and transmission circuits can occur in other makes and models, triggering different OBDII codes.