P0401 Fault Code

P0401 EGR System (Low Flow)

Component / System

EGR System - Low Flow

Monitor Strategy Description

Compare demanded EGR flow to actual

Fault Limit

Ratio = (Measured EGR mass flow Modeled EGR mass flow) < 0.55

Enable Conditions

Engine Speed 1300 - 1800 RPM
Engine Torque 625 - 2000 Nm
EGR Position 70 - 100 %
EGR Flow Demand 0.1 - 0.4 kg/s
Ambient Air Temperature -8 - 55 °C
Barometric Pressure 75 - 105 kPa
Coolant Temperature > 65 °C

Disable Conditions

No Active DTC's:
P0069, P046C, P0234, P0299

Time Required For P0401 DTC To Be Set

4 Seconds

MIL Illumination

2 Drive Cycles

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Don't forget ! When a fault code pops up, Volvo's Uptime Center is automatically notified via an cellular link, and it alerts the truck's owner by prearranged methods, usually email or phone calls.