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Engine-Codes – Generic – P0777

P0777 Code - Pressure Control Solenoid 'B' Stuck On

Quick Answer

The P0777 diagnostic trouble code indicates that the pressure control solenoid 'B' is stuck on in the transmission control system. Common causes include Faulty pressure control solenoid 'B', Wiring or connector issues, 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
P0777 indicates Pressure Control Solenoid 'B' Stuck On.
Common causes
Common causes include Faulty pressure control solenoid 'B', Wiring or connector issues, 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 07, 2024
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Code P0777 Description

The P0777 diagnostic trouble code indicates that the pressure control solenoid 'B' is stuck on in the transmission control system. This solenoid is responsible for regulating the hydraulic pressure within the transmission, which is crucial for proper gear shifting and overall transmission operation. When the solenoid gets stuck in the on position, it can lead to various issues within the transmission system.

OBDII Code P0777 - Pressure Control Solenoid 'B' Stuck On
P0777 Code - Pressure Control Solenoid 'B' Stuck On

Common Causes of P0777

  1. Faulty pressure control solenoid 'B'
  2. Wiring or connector issues
  3. Low transmission fluid levels
  4. Internal transmission problems
  5. Electronic control module (ECM) failure

Symptoms of P0777

  1. Harsh or delayed shifting between gears
  2. Transmission slipping
  3. Lack of acceleration or power
  4. Overheating
  5. Rough and jerky ride

How to Fix P0777

  1. Begin by performing a thorough inspection of the transmission system to identify the root cause of the issue.
  2. Test the pressure control solenoid 'B' to determine if it is functioning correctly. Replace it if necessary.
  3. Check the wiring and connectors for any signs of damage or corrosion. Repair or replace as needed.
  4. Inspect the transmission fluid level and condition. Top off or replace the fluid if it is low or contaminated.
  5. If the issue persists, consult a professional technician for further diagnosis and potential transmission repairs.

Cost to Fix P0777

The typical repair costs for addressing a pressure control solenoid 'B' stuck on issue can range from $200 to $500, including parts and labor. However, it is important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is recommended to check with local auto repair shops for a more accurate estimate. Labor rates commonly range between $80 and $150 per hour, but rates may vary at dealerships or in metropolitan areas. Independent shops may offer lower labor rates.

What does this mean?

Tech Notes for P0777

When a transmission solenoid has 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, 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.





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When is the Code Detected?

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

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Code P0777 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 P0777 Code

What are the common symptoms of OBDII code P0777?

Common symptoms of OBDII code P0777, Pressure Control Solenoid 'B' Stuck On, may include harsh shifting, transmission slipping, decreased fuel efficiency, and the transmission being stuck in one gear.

What are the possible causes of OBDII code P0777?

Possible causes of OBDII code P0777 include a faulty pressure control solenoid, wiring issues, low transmission fluid level, dirty transmission fluid, or internal transmission problems.

How serious is OBDII code P0777?

OBDII code P0777 should be addressed promptly as it can lead to further damage to the transmission if left untreated. It is recommended to have the issue diagnosed and repaired by a qualified mechanic.

Can I still drive with OBDII code P0777?

It is not recommended to continue driving with OBDII code P0777, as it can cause damage to the transmission. It is advisable to have the issue addressed as soon as possible.

How do I diagnose OBDII code P0777?

Diagnosing OBDII code P0777 involves using a scan tool to retrieve the code, checking the transmission fluid level and condition, inspecting the wiring and connections to the pressure control solenoid, and performing further tests as needed.

What are some repair tips for OBDII code P0777?

Repair tips for OBDII code P0777 may include replacing the pressure control solenoid, repairing or replacing damaged wiring, ensuring the transmission fluid is at the correct level and is clean, and addressing any other underlying transmission issues.

Is it possible to reset OBDII code P0777 without fixing the issue?

While it is possible to clear the code using a scan tool, it is not recommended to do so without fixing the underlying issue. The code is likely to return if the problem is not resolved.

How much does it typically cost to repair OBDII code P0777?

The cost of repairing OBDII code P0777 can vary depending on the underlying cause of the issue, the labor rates of the repair shop, and the cost of any replacement parts needed. It is recommended to obtain quotes from reputable mechanics.

Can OBDII code P0777 be triggered by other issues besides the pressure control solenoid?

Yes, OBDII code P0777 can be triggered by other issues such as wiring problems, low transmission fluid level, dirty transmission fluid, or internal transmission issues. It is important to diagnose the exact cause of the code before proceeding with repairs.

Discuss the causes and fixes for P0777 OBDII Code

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