P0778 - OBD Trouble Code

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What does the error code P0778 signify? Are you looking for symptoms are ways to escape from this? For your engine to function normally, with the help of a variety of sensors, the PCM will monitor the fluid pressure. You will find a preset manufacturer specification which informs as to what the voltage reading should be, to the PCM, so as to ensure optimum fluid pressure If there is no proper voltage information, then the PCM will assume an error and store the error code P0778.

This is a general type of error code and is set when the PCM finds the output voltage of pressure control solenoid is caught at 0 volts or has shorted voltage when the solenoid is functioning as per the valid TCM’s gear calculations and policies. Every automatic transmission will use hydraulic pressure to complete gear shifts and to lock and unlock several components like clutch packs, etc.

The PCM/TCM will use a list of pressure control solenoids so that the so gear shifts are comfortable and you can redirect the transmission fluid from one circuit to other. The procedure is similar to how gears are coupled and locked in different combinations in manual transmission in order to bring out different gear ratios. However, it highly depends on how effectively the pressure fluid is channeled between circuits. If the component fails, then it’s impossible to control them effectively. In this case, the P0778 error code will be set along with an illuminated warning light.

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

• Either the electronic pressure control solenoid B, or the solenoid B valve are defective.
• The fluid passage of the transmission has blockages.
• Failure of the internal transmission.
• The level of the transmission fluid is low, muddy or is either polluted.
• The pressure control solenoid B has defective electrical components in itself.

1. Pressure Control Solenoid - The pressure control solenoid has to function normally. If it malfunctions, then it’s good to get it replaced to avoid P0778 error code.
2. Powertrain Control Module - The powertrain control module can give rise to this error code if it is broken or faulty. Find the right replacement from Parts Avatar at best prices online.
3. Transmission Filter - Visually inspect the filter for blockages or damages. If you find either of these, replace or clean them clearly.
4. Body Control Module Component - You can find the right replacement for your defective body control module from Parts Avatar at best prices online.
5. Auto Transmission Valve Body - A broken or damaged auto transmission valve body must be replaced instantly to avoid error.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P0778 code by mentioning some major symptoms below:

Common Symptoms

The symptoms for a P0778 error code may vary. Addition to the check engine light illumination, the mechanics will notice:

• Difficulty in shifting gears.
• Rough shifts.
• Transmission slip.
• Transmission over burn.
• Fuel economy is less.
• The torque converter clutch will neither lock or unlock.

Have a look at some ways with which you can correct the P0778 code:

• The electronic pressure control solenoid B / solenoid B valve needs replacement.
• The fluid passage of the transmission has to be made clear.
• Checking the internal transmission fault.
• The transmission fluid has to be refilled, or the muddy polluted component must be replaced.
• The defective pressure control solenoid B must be replaced.

Don’t get tensed if you are still facing any of these issues as we care for our customers and that’s why we offer a good range of pressure control solenoid, power control module, sensors, connectors and a lot more. We are sure that now all your issues would be resolved.

Here are some steps which you should follow in order to diagnose this fault code:

• Once your OBD-II scanner identifies that there is a P0778 error code in the vehicle, there are two important things that the technician will carry out. Firstly, the technician will inspect all the electric cables, connectors, harness as well as the transmission fluid. If there are any broke/ damaged or defective loose cables they have to be changed immediately. Also see if the transmission fluid is polluted. If so, then you have to flush the fluid and refill the system with clean fluid.
• There are especially two common and comparatively reasonable repairs that can cause this code. After each and every consecutive repair, the technician will clear the power control module and reset the entire system. Even after the retest if the P0778 error code appears, then the technician will begin to test the solenoids and other components which might be faulty, until the fault is found.

Common Mistakes When Diagnosing the P0778 Code

One of the most common mistakes, while diagnosing the P0778 error codes is replacing the high-pressure pump by mistake, rather than checking for faults in the solenoids or the wires.