EGRMaxxForce Diesel ECM

P0404

Name: ECM Performance
Address: Fort Lauderdale, FL, 33325, US
Telephone: (888) 768-2447
Price range: $$-$$$

Exhaust gas recirculation valve, cooler, and flow faults.

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System

MaxxForce EGR

MaxxForce ECM Service

Diagnostic Overview

MaxxForce fault code P0404 generally indicates EGR valve range or performance. The ECM is seeing that the EGR valve position or response is not within the expected range. This can happen when the valve sticks, the actuator is weak, the position feedback is inaccurate, or carbon buildup prevents smooth movement. Symptoms may include rough running, smoke, poor acceleration, and derate.

Likely Causes

Sticking EGR valve, carbon buildup, failed EGR actuator, position sensor fault, wiring issue, connector problem, restricted EGR cooler, or calibration/relearn issue.

What To Check First

Run an EGR actuator test, compare commanded and actual EGR position, inspect the valve for carbon binding, check wiring and connectors, and perform relearn/calibration if required.

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Related EGR Fault Codes

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SPN 2659 FMI 21

MaxxForce fault code SPN 2659 FMI 21 is commonly associated with low EGR flow or EGR flow performance.

P0401

MaxxForce fault code P0401 generally means insufficient EGR flow.

SPN 912

MaxxForce fault code SPN 912 is listed in the EGR category in the supplied file, but the FMI is not provided.

SPN 2791 FMI 12

MaxxForce fault code SPN 2791 FMI 12 is commonly associated with an EGR valve actuator or controller fault.

SPN 2791 FMI 14

MaxxForce fault code SPN 2791 FMI 14 is commonly associated with an EGR valve initialization, failsafe, or actuator-control fault depending on calibration.

SPN 108

MaxxForce fault code SPN 108 is commonly associated with barometric pressure or atmospheric pressure input, which can affect EGR and turbo calculations.

View All EGR Codes →