What does Cummins fault code 3375 mean?

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AftertreatmentCummins Diesel ECM

Fault Code 3375

DPF, DEF, SCR, and NOx-reduction system faults.

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Cummins Aftertreatment

Cummins ECM Service

Diagnostic Overview

Cummins fault code 3375 generally relates to DEF quality monitoring, SCR performance, or emissions inducement. The ECM may be warning that the DEF/SCR system is not meeting emissions requirements. Common causes include poor DEF quality, contaminated DEF, failed DEF pump, blocked doser, faulty NOx sensors, exhaust leaks, or catalyst degradation. Diagnosis should include DEF quality testing, inspection for crystallization, NOx sensor comparison, and completion of the required service procedure after repairs.

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Related Aftertreatment Fault Codes

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555

Cummins fault code 555 is commonly associated with high crankcase pressure or excessive engine blow-by.

1881

Cummins fault code 1881 commonly points to an aftertreatment DPF differential pressure sensor circuit problem, often a low-voltage, open-circuit, or signal issue.

1887

Cummins fault code 1887 is typically related to DPF differential pressure, soot loading, or regeneration performance.

1977

Cummins fault code 1977 is generally tied to aftertreatment regeneration performance or DPF restriction.

2639

Cummins fault code 2639 commonly relates to aftertreatment DPF differential pressure being above the expected range.

2771

Cummins fault code 2771 is commonly associated with SCR aftertreatment performance, DEF dosing, or NOx reduction issues.

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