What does Cummins fault code 5865 mean?

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AftertreatmentCummins Diesel ECM

Fault Code 5865

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

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Cummins Aftertreatment

Cummins ECM Service

Diagnostic Overview

Cummins fault code 5865 commonly relates to SCR conversion efficiency or aftertreatment performance. The ECM may determine that the SCR catalyst is not reducing NOx emissions as required. Causes include poor DEF quality, improper dosing, a clogged or crystallized doser, faulty inlet or outlet NOx sensor, exhaust leaks, contaminated catalyst, or catalyst deterioration. Diagnosis should include DEF quality testing, DEF dosing verification, NOx sensor comparison, and exhaust leak inspection before replacing the SCR catalyst.

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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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