What does Cummins fault code 3376 mean?

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AftertreatmentCummins Diesel ECM

Fault Code 3376

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

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Cummins Aftertreatment

Cummins ECM Service

Diagnostic Overview

Cummins fault code 3376 is typically associated with DEF quality, SCR efficiency, or DEF/SCR system response. The ECM may detect that NOx reduction is not matching the amount of DEF being dosed. Causes include contaminated DEF, diluted DEF, DEF dosing failure, faulty NOx sensors, exhaust leaks, or an SCR catalyst that is no longer converting properly. A technician should verify DEF quality, inspect the dosing system, compare NOx sensor readings, and confirm SCR performance after the repair.

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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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