Faulty fuel pressure sensor
Faulty fuel pump
Fuel pressure sensor harness is open or shorted
Fuel pressure sensor electrical circuit poor connection
Blocked fuel filter
Fuel line restricted
Faulty fuel pressure regulator
Engine Light ON (or Service Engine Soon Warning Light)
This fault code is stored in the Engine Control Module (ECM) when the fuel pressure is not as expected. Normally manufacturers will support data parameters for actual and desired fuel pressure. When there is a conflict the Engine Control Module stores a fault code.
A number of issues may cause this fault code to be set such as a faulty fuel rail pressure sensor, a mechanical fault with the inlet metering valve or rail pressure control solenoid could cause the valve to become stuck. An electrical fault such as an open circuit in the inlet metering valve or fuel pressure control solenoid on a system with a normally closed valve will also cause this situation. A short circuit on the control wire of a normally open inlet metering valve will also cause this fault.
A fault in the fuel injector return system causes the fuel pressure to be lower than expected. This causes fuel from the high-pressure circuit to be leaked back to the low-pressure circuit. A faulty maximum pressure relief valve will also cause this situation.
The high-pressure pump should also be tested to ensure it is capable of delivering the required volume of fuel.