Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that a part in your car's transmission, which helps change gears smoothly, isn't working all the time. It's like a light switch that sometimes doesn't turn on when you flip it.
The P0779 code indicates that the transmission control module (TCM) has detected an intermittent issue with the pressure control solenoid B, which is responsible for regulating hydraulic pressure in the transmission.
The pressure control solenoid B is part of the automatic transmission system. It regulates the hydraulic pressure used to engage and disengage gears. An intermittent issue suggests that the solenoid is not consistently functioning, which can lead to improper gear shifting.
• Erratic or harsh shifting
• Transmission slipping
• Check Engine Light illuminated
• Faulty pressure control solenoid B
• Wiring issues or poor electrical connections
• Transmission fluid problems (e.g., low or dirty fluid)
Transmission: A system in a vehicle that transmits power from the engine to the wheels.
Solenoid: An electromechanical device that controls fluid flow in the transmission.
• Check the transmission fluid level and condition.
• Inspect the wiring and connectors for damage or corrosion.
• Test the pressure control solenoid B for proper operation.
• Replace the faulty pressure control solenoid B.
• Repair or replace damaged wiring or connectors.
• Change the transmission fluid and filter if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Honda Accord
• Toyota Camry
• Ford F-150
• Regularly check and maintain transmission fluid levels.
• Schedule routine transmission service.
• Inspect wiring and connectors periodically.
Transmission System Issue
• Avoid driving aggressively until the issue is resolved.
• Seek professional diagnostic services if unsure about repairs.
Check if the vehicle's powertrain warranty covers transmission components.
This code has been reported in various models, often related to solenoid wear or electrical issues.
Moderate – Address promptly to avoid further transmission damage.
Driving with a faulty transmission can lead to unsafe driving conditions. Address the issue as soon as possible.
• Vehicle at operating temperature
• Transmission in drive mode
The pressure control solenoid B is located inside the transmission, often accessible by removing the transmission pan.
Q: Can I drive with a P0779 code?
A: It's not recommended to drive for extended periods with this code, as it can lead to further transmission damage.
Q: How do I reset the P0779 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is resolved, it should not return.
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