What does Cummins fault code 6767 mean?

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AftertreatmentCummins Diesel ECM

Fault Code 6767

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

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System

Cummins Aftertreatment

Cummins ECM Service

Diagnostic Overview

Cummins fault code 6767 is generally associated with modern aftertreatment monitoring, SCR performance, DEF dosing, or emissions system inducement. The ECM may detect abnormal NOx conversion, DEF system response, or sensor feedback. Common causes include DEF contamination, low DEF pressure, failed DEF doser, faulty NOx sensors, wiring faults, exhaust leaks, or SCR catalyst degradation. The technician should diagnose all related aftertreatment codes together and verify DEF quality, dosing operation, and NOx reduction 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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