Skip the auto shop - Our mechanics make house calls

P0775 OBD-II Trouble Code: Pressure Control Solenoid B Malfunction

Check Engine Light

P0775 code definition

The P0775 code identifies a problem with a solenoid located within an automatic transmission.

The P0775 code is associated with the P0776, P0777, P0778, and P0779 codes.

What the P0775 code means

The P0775 code is the OBD-II generic code for insufficient fluid pressure within a solenoid operating the automatic transmission. When the P0775 code is indicated, then that means that a hydraulic solenoid in the transmission is not experiencing the proper amount of pressure from the hydraulic fluid. These solenoids are responsible for moving the transmission into gear and controlling the torque converter. Insufficient fluid pressure means that the solenoids may not be able to operate correctly.

What causes the P0775 code?

The insufficient solenoid pressure code may have several causes:

  • Leaks or blockages in fluid pathways within the transmission
  • Malfunctioning electronic pressure control solenoid
  • Low or dirty transmission fluid
  • Electrical problem with transmission control module
  • Electrical problem with powertrain control module
  • Mechanical issue within the transmission

What are the symptoms of the P0775 code?

The P0775 code has most directly to do with the transmission. Because of this, symptoms that coincide with the P0775 code involve transmission performance. In some vehicles, this code will cause the transmission to go into “limp” mode, slowing and reducing transmission function. Shifting will become rougher and less regular. The transmission will likely slip gears as well, and stands a higher chance of overheating. All of this will likely reduce fuel economy noticeably.

In some applications, this code must persist for a while before the Check Engine Light will illuminate on the dashboard.

How does a mechanic diagnose the P0775 code?

Before doing any significant diagnostic work, the technician will check the transmission fluid levels while also checking the fluid quality. If there is low or dirty fluid in the transmission, it is likely the cause of the P0775 code.

After the fluid is checked, a certified technician will use an OBD-II scanner to view the trouble code in real-time to see when it was first indicated. Then the code will be reset before the technician takes the vehicle for a test drive. If the code appears again during the course of the test drive, then it will confirm that the original code was not the result of an electrical short or issue that occurs intermittently.

Once the code appears again, the wiring and circuitry around the transmission control module and the powertrain control module will be inspected for damage or disconnections. The circuitry will then be tested by a technician with a voltmeter.

Common mistakes when diagnosing the P0775 code

Parts like the high pressure pump, electronic pressure control solenoid, and the wiring harness are often replaced unnecessarily when this error code appears. Often, the problem arises due to poor quality or insufficient quality regarding the transmission fluid. Small, intermittent electrical issues can also cause this code to appear, so it is wise to do a full diagnosis of the issue when the P0775 code appears.

How serious is the P0775 code?

The P0775 code has the potential to significantly hinder vehicle performance via the transmission. If the transmission enters “limp” mode or if the issues within the transmission prevent proper operation, then the fuel economy and overall performance will suffer. For these reasons, the P0775 code is serious enough that it should be diagnosed immediately.

What repairs can fix the P0775 code?

The most common repairs to address the P0775 are as follows:

Additional comments for consideration regarding the P0775 code

Codes for the torque converter clutch, shift solenoid, gear ratios, and transmission slippage often accompany the P0775 code. The amount of pressure that is needed within the solenoids controlling the transmission is determined by throttle position, engine speed, and several other metrics that are calculated together to determine the the correct gear and amount of torque converter lockup.

Need help with a P0775 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed Related Trouble Codes: P2441: EVAP Vent Valve Stuck Open EVAP trouble...


Related questions

Q: Engine light on. P000B Code

Hello. When this code comes up it is because the computer is not detecting that the camshaft is moving as it should when the variable valve timing system is functioning. This can be caused by a number of things. It...

Q: Check Engine Light and code for O2 sensor

Hello. Knowing the actual code number would help determine the problem. If you are getting an O2 sensor code associated with the way it is running, then the sensor is more than likely bad. On this Toyota, the O2 sensor...

Q: Acceleration hesitation while climbing up sometime check engine light appear, high fuel consumption.

I would recommend checking the mass air flow sensor as this is a commonly known part that can cause this kind of loss of power. This regulates the air intake into the fuel injection and ensures a proper air/fuel mixture....