Storing the DTC P0148 OBDII code next to the Check Engine light means that the PCM (Powertrain Control Module) has detected a problem in the high-pressure fuel delivery system of a diesel engine.
The diesel fuel supply pump has a high pressure, which is necessary for the direct injection system. The PCM electronically controls the FCA (Fuel Control Actuator), which regulates the fuel pressure in the high-pressure chambers of the engine. Besides, there is a sensor that allows the PCM to monitor fuel pressure during the engine operation.
Symptoms of fault code P0148 Generic
MIL light ON.
Fuel efficiency decreases.
Low engine performance.
A strong odor of diesel fuel.
Causes of OBD2 P0148 Generic
Diagnostic code P0148 OBD2 is set due to the following:
The high-pressure fuel system may be leaking.
The Fuel Rail Pressure Sensor (FRP) may be damaged.
The fuel control actuator may be defective.
Shorted high-pressure fuel supply system wires.
The fuel pump or relay may not be working properly.
Possible solutions of the DTC code P0148 Generic
When troubleshooting the P0148 OBDII error code, take into account the following suggestions:
First, check the TSBs corresponding to your vehicle frequently.
If you smell a strong diesel fuel odor, it may be due to leaks. Look for such leaks. Make sure fuel supply lines and components are properly tightened.
Measure the fuel pressure. If the result does not meet the manufacturer's specifications, the fuel pump may be faulty.
Change the fuel filter.
Use a DVOM to test the FRP Sensor and the FCA. Compare with the recommendations of the information source. If they do not comply, replace them.