What does Cummins fault code 1887 mean?

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AftertreatmentCummins Diesel ECM

Fault Code 1887

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

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Cummins Aftertreatment

Cummins ECM Service

Diagnostic Overview

Cummins fault code 1887 is typically related to DPF differential pressure, soot loading, or regeneration performance. The ECM may be seeing pressure readings that do not match expected DPF flow or soot load. This can happen when the DPF is restricted, the pressure tubes are plugged or leaking, the differential pressure sensor is inaccurate, or the engine is producing excessive soot. The first step is to check for related DPF pressure sensor codes, inspect the sensor tubes, review regen history, and verify whether the DPF needs regeneration, cleaning, or replacement.

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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.

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.

2777

Cummins fault code 2777 usually points to a DEF dosing or SCR system performance concern.

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