AutoCodes – Mazda – P0779 Mazda

P0779 Mazda Code - Pressure Control Solenoid 'B' Intermittent

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: P0779 Mazda indicates Pressure Control Solenoid 'B' Intermittent.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,167

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0779 Mazda 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 P0779 Mazda - Pressure Control Solenoid 'B' Intermittent - AutoCodes.com — P0779 Mazda Code - Pressure Control Solenoid 'B' Intermittent

What does this mean?

What are the Possible Causes of the DTC P0779 Mazda?

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 P0779 Mazda?

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 P0779 Mazda 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.

Need more information about the P0779 Mazda code?

Need more information on how to fix the P0779 Mazda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0779 Mazda code diagnosed by a professional: Find a repair shop in your area

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 P0779 Mazda Code

1. What does the OBDII code P0779 mean on a Mazda?

P0779 indicates an issue with the Pressure Control Solenoid 'B,' specifically an intermittent fault in its operation, which affects the transmission's ability to regulate hydraulic pressure.

2. What are the common symptoms of code P0779 in a Mazda?

Symptoms may include harsh or delayed shifting, transmission slipping, poor fuel economy, and the Check Engine Light illuminating.

3. What causes a P0779 code to appear on a Mazda?

Common causes include a faulty pressure control solenoid 'B,' low or contaminated transmission fluid, damaged wiring or connectors, or issues within the transmission control module (TCM).

4. Can driving with a P0779 code damage my Mazda's transmission?

Yes, ignoring this code can lead to further transmission damage, as improper hydraulic pressure regulation can cause excessive wear on internal components.

5. How can I diagnose the P0779 code on my Mazda?

Start by checking the transmission fluid level and condition, inspecting the wiring and connectors for damage, and testing the pressure control solenoid 'B' for proper function using a multimeter or scan tool.

6. What repairs are typically needed to fix the P0779 code?

Repairs may include replacing the pressure control solenoid 'B,' repairing or replacing damaged wiring or connectors, flushing and refilling the transmission fluid, or reprogramming or replacing the TCM if necessary.

7. How much does it cost to fix a P0779 code on a Mazda?

Repair costs vary but typically range from $150 to $400 for solenoid replacement, plus additional costs for diagnostics or labor if wiring or TCM repairs are required.

8. Can low transmission fluid cause the P0779 code?

Yes, low or contaminated transmission fluid can impair the solenoid's function and trigger the P0779 code.

9. Do I need to replace the transmission for a P0779 code?

Not necessarily. In most cases, the issue can be resolved by addressing the solenoid, wiring, or fluid, rather than replacing the entire transmission.

10. Can I reset the P0779 code without fixing the problem?

You can clear the code with an OBDII scanner, but the issue will likely return unless the underlying problem is resolved.