When to use fault code p0748 in OBD II?
OBD II fault code P0748 is a generic code that is defined as “Transmission fluid pressure (TFP) solenoid –electrical”, and is set when the PCM (Powertrain Control Module) detects a failure or malfunction in either the electrical control circuit of the transmission pressure control solenoid, or a failure or malfunction of the pressure control …
What is the solenoid code for transmission fluid pressure?
Note though that not all manufacturers label the solenoids (or label them in the same way) so if code P0748 is present, it more often than not refers to pressure control solenoid “A”. However, always refer to the manual for the application to determine exactly which solenoid code P0748 refers to on that application.
How does the PCM monitor transmission fluid pressure?
To keep the transmission fluid pressure within design limits, the PCM continually monitors the actual fluid pressure at various points in the transmission, and compares this pressure to the desired pressure.
OBD II fault code P0748 is a generic code that is defined as “Transmission fluid pressure (TFP) solenoid –electrical”, and is set when the PCM (Powertrain Control Module) detects a failure or malfunction in either the electrical control circuit of the transmission pressure control solenoid, or a failure or malfunction of the pressure control
Note though that not all manufacturers label the solenoids (or label them in the same way) so if code P0748 is present, it more often than not refers to pressure control solenoid “A”. However, always refer to the manual for the application to determine exactly which solenoid code P0748 refers to on that application.
To keep the transmission fluid pressure within design limits, the PCM continually monitors the actual fluid pressure at various points in the transmission, and compares this pressure to the desired pressure.
What does the line pressure solenoid on a VW do?
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM). Need more information on how to fix the P0748 VOLKSWAGEN code? Need more help?
How much does it cost to repair a p0748 VW?
The cost of diagnosing the P0748 VOLKSWAGEN code is 1.0 hour of labor. The auto repair’s diagnosis time and labor rates vary by location, vehicle’s make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
What causes an error on a pressure control solenoid?
The pressure control solenoid electrical may set an error if any of the following conditions exist: Contaminated or dirty transmission fluid. Low transmission fluid. Hydraulic clogs inside the transmission fluid passageways. A bad electronic pressure control solenoid.
What does p0748 mean on a VW transmission?
Excessive debris or metal particles on the transmission pan could be an indication that there is a mechanical transmission failure and that the transmission will need to be rebuilt or replaced. What does this mean? The cost of diagnosing the P0748 VOLKSWAGEN code is 1.0 hour of labor.
How to diagnose a p0748 pressure control solenoid?
When diagnosing a P0748 code, it is important to record the freeze frame information and then to duplicate the code setting conditions with a test drive at the freeze frame road speed. Start out from a dead stop and gently accelerate. Watch the scan data to see if the PCM is commanding the Pressure Control Solenoid.
When does the PCM set the code p0748?
The code P0748 is set by the PCM when the Pressure Control Solenoid “A” is experiencing an electrical malfunction. Example of a transmission pressure control solenoid:
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM). Need more information on how to fix the P0748 VOLKSWAGEN code? Need more help?
What is the error code for pressure control solenoid?
Error Code P0748 is defined as Pressure Control Solenoid A Electrical. This is a generic trouble code, meaning it applies to all vehicles with the OBD-II system, especially those made since 1996 up to present and equipped with automatic transmission.
How does the PCM control the pressure solenoids?
Based on the signals from associated devices monitoring the speed of the vehicle, the PCM controls the pressure solenoids to direct fluid at the appropriate pressure to various hydraulic circuits that change the transmission gear ratio at the correct time.
How does the solenoid valve on an oil pump work?
Opening the exhaust port decreases the output fluid pressure regulated by the PC solenoid valve, which ultimately decreases line pressure. The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM).
What does p0748 stand for on a PCM?
When the Powertrain Control Module (PCM) detects a continuous open or short in the Pressure Control (PC) solenoid valve circuit the P0748 code is set. The Pressure Control (PC) solenoid valve is an electronic device that regulates transmission line pressure based on the current flow through its coil winding.
Error Code P0748 is defined as Pressure Control Solenoid A Electrical. This is a generic trouble code, meaning it applies to all vehicles with the OBD-II system, especially those made since 1996 up to present and equipped with automatic transmission.
How does the PCM control the solenoid valve?
The magnetic field produced by the coil moves the solenoid’s internal valve which varies pressure to the pressure regulator valve. The Powertrain Control Module ( PCM) controls the PC solenoid valve by applying a varying amount of amperage to the solenoid.