P0779 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 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.
Code P0779 Description
What are the Possible Causes of the DTC P0779?
- 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?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0779 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.
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Information for Specific Makes
- P0779 Audi — Pressure Control Solenoid 'B' Intermittent
- P0779 Mazda — Pressure Control Solenoid 'B' Intermittent
- P0779 Volkswagen — Pressure Control Solenoid 'B' Intermittent
Frequently Asked Questions about P0779 Code
1. What does the OBDII code P0779 mean?
P0779 indicates an intermittent issue with Pressure Control Solenoid 'B,' which is responsible for regulating hydraulic pressure in the transmission.
2. What are the common symptoms of a P0779 code?
Symptoms may include erratic or delayed shifting, transmission slipping, reduced fuel efficiency, and the Check Engine Light being illuminated.
3. What causes the P0779 code to appear?
Common causes include a faulty pressure control solenoid, wiring issues such as damaged or corroded connections, low transmission fluid, or a failing transmission control module (TCM).
4. Can I drive with a P0779 code?
Driving with a P0779 code is not recommended, as it may cause further damage to the transmission or lead to unsafe driving conditions.
5. How is the P0779 code diagnosed?
A mechanic will use a scan tool to confirm the code, inspect the transmission fluid level and condition, check the wiring and connections, and test the functionality of the pressure control solenoid.
6. How do I fix a P0779 code?
Repairs may include replacing the pressure control solenoid, repairing or replacing damaged wiring, flushing the transmission, or updating/replacing the TCM.
7. What does it cost to fix a P0779 code?
Repair costs vary depending on the issue but can range from $150 to $400 for solenoid replacement, while more extensive transmission repairs could cost significantly more.
8. Can low transmission fluid cause a P0779 code?
Yes, low or dirty transmission fluid can cause the solenoid to operate improperly, leading to this code.
9. How can I prevent a P0779 code from occurring?
Regular maintenance, such as checking and replacing transmission fluid and inspecting wiring, can help prevent issues leading to this code.
10. Does a P0779 code always mean the solenoid is bad?
No, it could also be caused by wiring issues, a defective TCM, or even contaminated transmission fluid, so proper diagnosis is essential.
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