What does Cummins fault code 3319 mean?

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AftertreatmentCummins Diesel ECM

Fault Code 3319

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

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Cummins Aftertreatment

Cummins ECM Service

Diagnostic Overview

Cummins fault code 3319 commonly involves DEF pump, DEF pressure, or DEF dosing system operation. The ECM may be seeing pressure that is too low, too high, or unstable during DEF system operation. Causes can include a weak DEF pump, plugged filter, restricted line, frozen DEF, crystallized DEF, contaminated fluid, failed pressure sensor, or damaged wiring. Diagnosis should include a DEF pressure test, doser test, fluid quality test, and inspection for leaks, restrictions, and crystallization.

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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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