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Volvo Check Fuel Filter – Instrument Cluster
Warning Message - US20 Emissions And Newer
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Beginning with US17+OBD20 and US21+OBD20 emissions (Emissions level
depends on the engine
attachments
installed), vehicles built with Volvo engines have been equipped with a dedicated supply fuel pressure
No links
sensor. The pressure sensor is used to continually monitor the fuel supply pressure
andor
provide early
attachments
available
warning detection of low fuel supply pressure or filter restriction. The engine control module (EMS)
monitors the pressure sensor values and activates a warning message in the instrument cluster (IC)
when the supply pressure values are below the calibrated limit. It is necessary to have the correct
software for the EMS and IC to enable this early warning detection.

IMPORTANT
Any potential root cause for a decrease in supply fuel
pressure will activate the warning message.
The warning message does not automatically indicate fuel
filter(s) are the only component that needs to be investigated
for the decrease in supply fuel pressure.
Example of message:

Applicable Vehicles with a Main software (MSW) Part Number listed below or newer for the EMS
and IC will have the early warning fuel filter restriction message enabled.
IC MSW Part #
Engine
11L VGT
13L VGT
13L TC

23752214
EMS MSW Part #
23783118
23783118
23783119

Description of functionality: How and when warning
message will appear.
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Once per drive cycle
If low supply fuel pressure is detected, the warning message will appear in the instrument cluster
display. It will remain in the “Pop-up Notices” screen in the instrument cluster display for the remainder
of that drive cycle.
Goes away after key off
On the next drive cycle, the warning message will no longer be displayed (unless the low supply fuel
pressure is detected again).
Warning message history can be viewed in Tech Tool
Tech Tool Operation ID 2300-08-03-02 Fuel Pressure. See the section below for more detailed
information.
P008A Low Pressure Fuel System Pressure - Too Low:
The functionality remains unchanged for model year 2021 and still has an associated MIL lamp.

Diagnosing Vehicles with Warning Message
Warning message history can be viewed in Tech Tool
Tech Tool Operation ID 2300-08-03-02 Fuel Pressure, in Tech Tool SW version 2.7.115 and later,
enables new functionality related to the warning message. Warning message history, as well as live
supply fuel pressure data, are available in this operation. See section below for more detailed
information.
Warning message has no corresponding DTC
The fuel filter warning message is not triggered by a DTC. Instead, parameters are transmitted by the
EMS for the instrument cluster to display the warning message. Below are new parameters related to
supply fuel pressure that can be viewed in Tech Tool Operation ID 2300-08-03-02 Fuel Pressure.
Parameter
P1WER
P1WES
P1WEM
P1WEG
P1F24

Description
Fuel System, Fuel Filter Clogging Symptom Detected, Status
Fuel System, Latest Clogged Fuel Filter Symptom Detected, Timestamp
Number of warning events since last EMS SW update
The first time since last EMS SW update that the warning was set
Supply Fuel Pressure (gauge)

Parameters/Warning Status cannot be cleared like a DTC
The warning message status parameters listed above (P1WER, P1WES, P1WEM, P1WEG) cannot be
erased/reset with a DTC clear. The only way to reset them is with an EMS SW update. However,
P1WER can be “healed” (see below).
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Warning Message Status (P1WER) takes 5 drive cycles to “heal”
The warning message status parameter P1WER, can “heal” and reset its status back to inactive. This
will occur if 5 drive cycles are completed with no warning message/low pressure symptoms being
detected.
Warning Message relationship with P008A, P20DC, P0087, P228F, P016F, P1036
The fuel filter warning message diagnostic is designed to be an early warning so the driver can bring
the vehicle in for filter replacement before more severe fuel system low pressure or high fuel pressure
DTCs occur. However, it is possible for a vehicle to have an active fuel filter warning status and other
fuel system DTCs active.

Further information
Fuel lter housing components

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PTT screen for Operation 2300-08-03-02 Fuel Pressure

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a

Tags

CHECK FUEL FILTER

SUPPLY PRESSURE

LOW FUEL PRESSURE

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