Error Code P0779: What It Means & What To Do?

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When will the component have irregular connection? What is this P0779 error code? This is a general type of diagnostic trouble code which is linked to the transmission, which includes, failure of the sensor and pressure faults. In one such scenario, the powertrain control

module will identify a fault with the Pressure Control Solenoid B which keeps receiving irregular voltage signals.

The engine control module will control the automatic transmission which has different degrees of hydraulic pressure further providing actuation of shift and lock up of the torque converter. The hydraulic pressure is controlled by the engine control module with the help of electronic pressure control solenoids.

The parameter set for your vehicle will vary based on each manufacturer if there is a P0779 error code. So, it is always best to check the service manual which is designed specifically for your vehicle make and model. However, as the PCM, uses the calculation from several sensors, including pressure control sensor, so as to define the pressure needed for operation. If the pressure, does not match with the ECM, then a P0779 error code will be stored.

What causes this problem with the Pressure Control Solenoid B Intermittent?

• The pressure control solenoid is broken.
• Polluted or murky fluid.
• Transmission filter is blocked.
• Broken transmission pump.
• Broken transmission valve body.
• Hydraulic passage has restriction
• Faulty connectors.
• Broken wires.
• PCM failure.

1. Pressure Control Solenoid - Looking for the right replacement part to avoid P0779 error code? Get them from parts Avatar.
2. Transmission Filter - The component has to be cleaned if there are any debris or replaced if the component is broken.
3. Transmission Pump - If the component does not pump the right amount of fluid, it might be leaky. Get them fixed as preferred.
4. Transmission Valve Body - P0779 error code can get stored if the system malfunction. Check for defects and replace them soon.
5. Body Control Module Component - As a very rare case, the P0779 error code can be avoided by changing the defective body control module.

We at Parts Avatar Canada care for our customers, and that’s why we will help you to diagnose P0779 code by listing out some major symptoms. They are mentioned below as follows:

Common Symptoms

There may be no symptoms at all to a deactivated shift function, where the error code is accompanied by placing the transmission in limp mode by the PCM. You will also find other symptoms like rude shifts, transmission slip, transmission burn, and so on. Other error codes which would accompany are converter clutch, lock up, gear ratio, shift solenoid etc.

Symptoms of a P0779 code may include:

• Illumination of the check engine or warning light.
• At times there may not be any possible symptoms.
• Torque converter clutch may not lock or unlock.
• Harsh shifting of the vehicle.
• In or out shifting of gear of the vehicle.
• Fuel economy is reduced.
• Overheating of the transmission.
• Experiencing transmission slip
• Entering the limp mode.

Learn the ways with which you can correct this trouble code:

• Transmission fluid must be filled as specified by manufacturer.
• Servicing your transmission fluid.
• You have to rebuild the transmission and flush fluids and change the torque converter clutch if there are rubbles in the transmission pan.
• If there are any defectives, open or shorted circuit or any loose cables and connections, replace them.
• If there are any leaks in the transmission, replace them.
• Are there any blocks in passage, clear them?
• Change the broken high-pressure pump.
• The pressure control solenoid B has to be replaced.
• The defective torque converter has to be changed.
• At a very rare times, you have to replace the defective ECM.
• Clear the error codes and test drive your vehicle and see if they reappear.

However, if you face any issue then we have stocked a wide range of best priced pressure control solenoid, transmission filter, transmission pump, connector, transmission valve body and more to help you out in fixing your car.

• It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0779 code to be stored:
• With the help of a scanner, inspect the stored trouble code P0779.
• Check the level and quality of the fluid in the transmission.
• The transmission fluid may be unclean and so check its pans if there are rubbles contamination.
• Check the circuits and its related wires for defectives and erosions.
• Inspect for leaks in the transmission.
• Check the pressure in the transmission pump with a manual pressure gauge.
• Check for blocks in the hydraulic passage.
• Inspect the electronic pressure control solenoid B for ground signal and reference voltage.
• With the help of DVOM, check for continuity in the circuits and resistance.

Common Mistakes When Diagnosing the P0779 Code

As a very rare case, the high-pressure pump is substituted by mistake instead of the defective pressure control solenoid or the broken or improper wire cables. It is wise to test all the circuits of the system and change them, if there are any damages, before replacing the high-pressure pump.