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.

Check Engine Light
trouble codes
P0779

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

(6,328)

Rating Summary
5,857
225
52
35
159
5,857
225
52
35
159

Gustavo

17 years of experience
296 reviews
Gustavo
17 years of experience
Toyota Corolla - Check Engine Light is on - New Braunfels, Texas
As always, punctual and professional. He explains the problem thoroughly. I feel confident in his work and knowledge.

Greg

22 years of experience
86 reviews
Greg
22 years of experience
Mazda 3 - Check Engine Light is on - Queen Creek, Arizona
Greg was scheduled for 1:00 but he was able to come earlier and let us know right away. He was very thorough and spent his time going thru the entire car.

Gustavo

17 years of experience
296 reviews
Gustavo
17 years of experience
Lincoln Aviator - Check Engine Light is on - San Antonio, Texas
Made call before appt. -courteous-knowledgeable-got part need & did prompt repair after computer check.

Claud

8 years of experience
325 reviews
Claud
8 years of experience
Chevrolet Trax - Check Engine Light is on - Grosse Pointe, Michigan
Very good experience. He arrived on time. Explained what he was going to do. Completed the work and was thorough in what I needed for my next service in plain language vs car jargon. I'm a raving fan of Claud!


More related articles

P0835 OBD-II Trouble Code: Clutch Pedal Switch B Circuit High
P0835 means there is an issue with the clutch position sensor circuit, possibly due to a defective or misadjusted sensor, or faulty wiring.
P0762 OBD-II Trouble Code: Shift Solenoid C Stuck On
P0762 code means the car’s computer has detected an unusual operation within shift solenoid C often due too low/dirty fluids or poor wire connections.
P2794 OBD-II Trouble Code: Gear Shift Direction Circuit Low
P2794 means there is a problem with a gear shift or lever direction or position due to a worn transmission, an electrical issue or a bad sensor.

Related questions

Engine light on. I have code p0013

Hi there. It is possible that the wrong oil was used or this can occur if a poor quality oil filter was installed. Most of the time though on this vehicle it is caused by a failure in one of...

Range Rover Sport v6 2.7 with fault code p2455 but the car does not have any sensor or circuit for the dpf.

Hi there. The DPF apparently was not installed in all markets, which may cause issues if the vehicle did not have it when manufactured, but is transported and sold into a market which does require it. I would check with...

My check engine light came on

You can try and have the throttle body and idle control valve cleaned first and code cleared. If the code returns then you will need to have the computer program updated for this code. There is a technical bulletin #13-FL-005....

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