P0148 - FUEL DELIVERY ERROR

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.

• MIL light ON.
• Fuel efficiency decreases.
• Low engine performance.
• A strong odor of diesel fuel.

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.

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.