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P0777 code definitionA P0777 trouble code signifies that the Powertrain Control Module (PCM) has detected a fault in one of the electronic pressure control solenoids or solenoid circuits. The hydraulic pressure regulated by the pressure control solenoids provides shift actuation for the automatic transmission and locks the torque converter into place when needed. Related codes include P0775, P0776, P0778, and P0779. What the P0777 code meansUtilizing calculations based on the position of the throttle, the amount of load on the engine, and engine and vehicle speed help in determining how much pump pressure is needed for the vehicle to operate efficiently. When the amount of pressure desired does not match up with the actual amount produced, the PCM stores a P0777 code and illuminates the Check Engine Light. Keep in mind that some model of vehicles might require multiple failures in order for a Check Engine Light to be illuminated. What causes the P0777 code?Some common causes of a P0777 trouble code include failure of the electronic pressure control solenoid, blockage in the hydraulics inside of the transmission, transmission failure, dirty or low fluid, and a faulty PCM or Transmission Control Module (TCM). What are the symptoms of the P0777 code?Symptoms of a P0777 trouble code range from none at all to problems shifting, or even a failure on the part of the torque converter. In some cases, when this trouble code is stored, the PCM places the transmission into Limp-in mode. Some other common symptoms of a P0777 code include slipping, overheating, shifting problems with the transmission, and a decrease in the vehicle's fuel mileage. How does a mechanic diagnose the P0777 code?To diagnose a P0777 trouble code, the mechanic needs an advanced scanner, a hydraulic pressure diagram for the vehicle in question, and a digital volt/ohmmeter. Once the necessary tools are gathered, the mechanic should perform the following steps when diagnosing the code:
*Once all leaks have been fixed, fill the transmission fluid to its normal level and start the vehicle, allowing it to reach a normal operating temperature.
Common mistakes when diagnosing the P0777 codeA common mistake made by mechanics when diagnosing a P0777 trouble code is to overlook faulty wiring and electronic pressure solenoids, and instead replacing a high pressure pump when it's not needed. This usually results in the return of the code. How serious is the P0777 code?While a vehicle that has a P0777 problem might not exhibit any outward problems, left unfixed, this code can result in problems with the transmission of the vehicle. Most often this materializes as problems shifting, up to and including failure of the torque converter. You can also expect to see a reduction in the vehicle's fuel mileage until the trouble code is fixed. A low fluid condition, if left unchecked, can result in damage to the transmission and require the mechanic to have to rebuild it. What repairs can fix the P0777 code?To repair a P0777 trouble code, the mechanic should perform the following steps:
Need help with a P0777 code?YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230. Check Engine Light trouble codes P0777 Where is the pressure control solenoid B location?Pressure control solenoids are located inside the transmission and are responsible for controlling pressure within the transmission's hydraulic circuits.
Where is transmission control solenoid located?In most cases, solenoids are located inside of the oil pan, connected to the valve body. Depending on what you drive, the technician may be able to replace just the failed shift solenoid.
What is pressure control solenoid B mean?The P0775 code is triggered when the PCM detects pressure control solenoid “B” is experiencing a malfunction. A malfunctioning transmission solenoid can be caused by low or dirty transmission fluid, wiring issues, or simply old age.
What is a solenoid B in a transmission?The role of a transmission shift solenoid is to control the flow of transmission fluid. The transmission control module (TCM) sends an electrical signal telling the shift solenoid when to transfer fluid into and out of the transmission and at what rate.
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