P0779 OBD-II Trouble Code: Pressure Control Solenoid B Intermittent

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0779 code

P0779 is a diagnostic trouble code (DTC) for "Pressure Control Solenoid B Intermittent". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0779 DIAGNOSTIC Get a fair and transparent estimate upfront

P0779 OBD-II Trouble Code: Pressure Control Solenoid B Intermittent

P0779 Code Definition

The P0779 code is a generic powertrain code related to the transmission, including sensor failures and pressure faults. In this case, the engine control module (ECM) has detected a fault with Pressure Control Solenoid B, receiving intermittent voltage signals.

Codes related to the P0779 include:

What the P0779 Code Means

The automatic transmission is controlled by the ECM with varying degrees of hydraulic pressure, which provides shift actuation and torque converter lock up. Utilizing electronic pressure control solenoids, which are controlled by the ECM, the hydraulic pressure is regulated.

The parameters for which a P0779 code can be set varies by each automaker, so check your service manual for specifics for your vehicle’s make and model. However, typically the ECM utilizes calculations from several sensors, including the pressure control sensor, to determine how much pump pressure is needed for operation. When the transmission fluid pressure doesn’t match the amount the ECM detects, a P0779 code can be stored.

What Causes the P0779 Code?

Several problems may cause a P0779 code including:

  • Low transmission fluid
  • Dirty or contaminated transmission fluid
  • Damaged or defective electronic pressure control solenoid
  • Hydraulic blockage inside transmission fluid passages
  • Transmission failure
  • Damaged or defective transmission control module
  • Damaged or defective ECM (rare)

What are the Symptoms of the P0779 Code?

Symptoms of a P0779 code may include:

  • Check Engine or Warning Light may illuminate
  • There may be no discernable symptoms for a P0779 code
  • The torque converter clutch may not engage
  • The torque converter clutch may not disengage
  • The vehicle may shift roughly
  • The vehicle may not shift in or out of gear (including park)
  • Decreased fuel economy
  • The transmission may overheat
  • You may experience transmission slippage
  • The transmission may enter “limp” mode

How Does a Mechanic Diagnose the P0779 Code?

A mechanic may use several methods to diagnose a P0779 trouble code, including:

  • Utilize an OBD-II scanner to check for a stored P0779 trouble code
  • Check transmission fluid level
  • Check transmission fluid quality
  • If transmission fluid is dirty, check transmission pan for contamination and debris
  • Check related wiring and circuitry for damage or corrosion
  • Check for any transmission fluid leaks
  • Use a manual pressure gauge to check transmission pump pressure
  • Check for clogged hydraulic passages
  • Check for reference voltage and ground signals at electronic pressure control solenoid B
  • Use a digital volt/ohmmeter to check all circuits for continuity and resistance

Common Mistakes when Diagnosing the P0779 Code

At times, a high pressure pump may be replaced in oversight of a faulty electronic pressure control solenoid or damaged or malfunctioning wiring. It is recommended to test all system circuitry and repair any damage within before replacing the high pressure pump.

How Serious is the P0779 Code?

Because a vehicle’s safe driving operation most likely will be impacted due to faults that store a P0779 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.

What Repairs can Fix the P0779 Code?

Several repairs can fix a P0779 trouble code and include:

Need Help with a P0779 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.

trouble codes
P0779
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0779 code.

SCHEDULE P0779 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,583

Rating Summary
5,159
204
50
34
136
5,159
204
50
34
136

Matt

16 years of experience
35 reviews
Matt
16 years of experience
Jeep Compass - Check Engine Light is on Inspection - Holly Springs, North Carolina
Matt was awesome! Very knowledgeable, thorough. Really knows his stuff. Best part was his level of interaction and being able to ask him questions directly. You just don’t get that at the shops. Will definitely be using this service again and requesting Matt for all future jobs. Thanks again, Matt!

Matthew

32 years of experience
828 reviews
Matthew
32 years of experience
Land Rover LR2 - Check Engine Light is on - Hampton, Virginia
Matt is my go-to mechanic. Always professional and explains in detail what the problem is and how it’s being fixed. Highly recommend.

Richard

16 years of experience
115 reviews
Richard
16 years of experience
Honda Accord - Check Engine Light is on - San Ramon, California
Richard is Polite and skilled in inspecting the issues. I do recommend him for doing diagnostics before giving your car to the garage.

Michael

15 years of experience
565 reviews
Michael
15 years of experience
Chevrolet Avalanche 1500 - Check Engine Light is on - Marietta, Georgia
What professional handled himself well understood what was wrong with the car corrected it immediately and was on time


More related articles

P2167 OBD-II Trouble Code: Throttle/Pedal Position Sensor E Maximum Stop Performance
P2167 P2167 code definition Throttle/Pedal Position Sensor E Maximum Stop Performance What the P2167 code means The P2167 code is a general OBD-II diagnostic trouble code (DTC) that indicates a fault with the throttle / pedal position sensor E maximum...
P0243 OBD-II Trouble Code: Turbocharger Wastegate Solenoid A Malfunction
P0243 code definition Turbocharger Wastegate Solenoid A Malfunction What the P0243 code means P0243 is a generic OBD-II code indicating that the...
P2066 OBD-II Trouble Code: Fuel Level Sensor “B” Performance
P2066 P2066 code definition Fuel Level Sensor “B” Performance What the P2066 code means P2066 is an OBD-II generic code for the engine control module (ECM) detecting the fuel level sensor “B” performance. The sensor output voltage is not accurate...

Related questions

My Engine Light has started been displayed since i had my AC repaired. Is it any issue?

The check engine light comes on when the Electronic Control Unit (ECU) has detected a fault and stored a trouble code. The only way to know what is the problem is to scan the ECU with the proper diagnostic equipment....

Code reading p0010 camshaft changed that having same problem car starts but don't stay running sometimes can it be sensors solend

A p0010 fault code does show that there is a problem with the camshaft actuator valve control circuit. This code is set when the computer is commanding a certain position for the actuator on the camshaft, but it is not...

Hello, my battery died in my car last night I replaced it got home and now it won't start. Starter or alternator? CEL on now also

Hello, thank you for writing in. With full battery power, the battery may still be struggling to use that voltage and it may not be providing enough amperage to the starter. You should have the battery tested at an automotive...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com