PACCAR PX-9 CM2350 (2013-17) Fault Code:2372 PID:95 SPN:95 FMI:0 Fuel Filter Differential Pressure – Data Valid But Above Normal Operating Range – Moderately Severe Level

Reason:
Fuel Filter Differential Pressure – Data Valid But Above Normal Operational Range – Moderately Severe Level. Excessive fuel flow restriction to the high pressure fuel pump has been detected.

Effect:
Possible reduced engine performance.

Circuit Description:
The engine control module (ECM) monitors engine operating conditions, including the reading of fuel rail pressure, and changes the flow command to either increase (OPEN the fuel pump actuator) or decrease (CLOSE the fuel pump actuator) the fuel supply to the high-pressure pump.

Component Location:
There are two fuel filters and several original equipment manufacturer (OEM) supplied components that can impact this fault code. The pressure-side fuel filter is typically mounted directly to the engine, but can also be remote mounted. The suction-side fuel filters and other OEM supplied components are OEM specific. The OEM is required to supply a suction-side filter, and the exact filter location is OEM dependent. Refer to the OEM service manual.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault Codes:
Fuel pressure was less than a calibratible value during high fuel flow conditions indicating a fuel inlet restriction.

Action Taken When the Fault Code is Active:
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
Low fuel pressure at rated speed/load indicates a fuel inlet restriction or a plugged pressureside fuel filter.

Possible Causes:
1) A plugged pressure or suction side fuel filter
2) Collapsed fuel inlet lines
3) An obstructed suction tube in the fuel tank
4) Plugged fuel tank vents.
5) Malfunctioning high-pressure fuel system

Note: The mounting location of the suction side fuel filter will vary by OEM, and can possibly not be in an obvious location.