What is the P0748 fault code and what does it mean? Pressure Control Solenoid “A” What is the electrical fault description? How to fix P0748 fault codes? What are the causes and symptoms of the P0748 error code?
What is the P0748 Fault code? What does it all mean?
P0748 refers to “Pressure Control Solenoid ‘A’ Electric”, but different vehicle models may have a different designation. The pressure control solenoid regulates the transmission line pressure by monitoring different driving conditions, such as speed, engine speed and throttle position. It transmits voltage signals to an on-board computer to adjust the pressure to match current conditions. The P0748 fault code will be set if these signals are not compatible with the fluid pressure values.
The powertrain control module, or PCM, monitors the transmission fluid pressure using data from various engine sensors. The PCM has pre-programmed pressure values that are appropriate for vehicle driving conditions. These pressure values will ensure that the engine runs efficiently.
The job of the pressure control solenoid is to regulate the fluid pressure so that the automatic transmission can function properly. The PCM is able to receive an electronic signal that is based on the pressure within the solenoids. The clutches and shifting belts that control the automatic transmission provide fluid pressure at the right moment.
The P0748 fault code will be triggered if the liquid required is not equal to the amount available. This indicates an insufficient voltage or electrical fault at the pressure control solenoid.
Automatic transmissions usually have at least three solenoids: A, B and C. Fault codes P0745 to P0746, P0747,P0748, P0748, P0748, P0748, and P0749 indicate problems with the “A” solenoid. To identify the circuit of the “A” solenoid in your vehicle, consult specific repair manuals.
P0748 fault codes are found in vehicles made by Ford, Mazda and Mercedes.
What causes the P0748 Fault code?
Below are some reasons to set fault code P0748:
- – Defective electronic pressure control solenoid “A”
- – Transmission oil at a low level
- Filter and transmission oil that is not clean
- – Clogged transmission fluid passagelines
- – Gearbox mechanical failures
- – Damaged wires, broken connectors, open and short circuits
- – Defective transmission pump
- – Hydraulic control unit defect
- – Defective TCM or PCM (rarely).
What are the symptoms for P0748 fault code?
The code can lead to a number of symptoms. Sometimes drivers don’t notice any defects in their vehicle. Sometimes, however, all functions of the shift may be disabled. Your torque converter clutch may not engage or disengage. The vehicle might enter safe mode in some instances.
You may experience the following symptoms if your vehicle has the code P0748:
- – Illumination at the check engine lights
- – Gear shifting difficulty or delay
- – Vehicle stuck in any gear
- – Irregular gear changes
- Transmission slippage when changing gears
- – The gearbox is overheated
- – Increased fuel consumption
- – Misfire-like symptoms
- – Vehicle enters failsafe mode and allows only one gear
- – Other related fault codes
How do I fix the P0748 fault code?
Repairing this code can be dangerous if you replace the transmission pump at high pressure instead of looking for the problem with the wiring or solenoid.
The following repairs may be able to resolve the P0748 fault code:
- – Replacing the “A” electronic pressure control solenoid
- Flushing blocked transmission fluid passage lines
- – Change dirty transmission fluid or filter
- – Fill the transmission fluid with more
- – Repairing and replacing damaged connectors and cables
- Repair of damaged or open cables
- – Repair of gearbox mechanical problems
- – Replacing electronic pressure regulator
- Repairing a damaged transmission pump
- – Replacing a defective hydraulic control unit
- – Replacement of TCM or PCM in rare cases
How serious is the P0748 Fault code?
It is important to address transmission problems as soon as possible. The P0748 code indicates that the PCM cannot control the torque converter or shift points. This could indicate a serious problem with your driving ability that could cause you to be unable to drive.
Even if the transmission has not suffered any internal mechanical failures, the continued operation of the vehicle can lead to a complete failure.
