Cummins Aftertreatment Fault Codes

Cummins fault code 555 is commonly associated with high crankcase pressure or excessive engine blow-by.

Cummins fault code 1881 commonly points to an aftertreatment DPF differential pressure sensor circuit problem, often a low-voltage, open-circuit, or signal issue.

Cummins fault code 1887 is typically related to DPF differential pressure, soot loading, or regeneration performance.

Cummins fault code 1977 is generally tied to aftertreatment regeneration performance or DPF restriction.

Cummins fault code 2639 commonly relates to aftertreatment DPF differential pressure being above the expected range.

Cummins fault code 2771 is commonly associated with SCR aftertreatment performance, DEF dosing, or NOx reduction issues.

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

Cummins fault code 2963 is commonly related to aftertreatment temperature sensing or exhaust temperature rationality.

Cummins fault code 3134 is commonly associated with SCR conversion efficiency.

Cummins fault code 3142 generally relates to DEF dosing, DEF system pressure, or SCR performance.

Cummins fault code 3146 is commonly tied to DEF quality, SCR performance, or emissions inducement logic.

Cummins fault code 3314 commonly points to a DEF system pressure, pump, or dosing fault.

Cummins fault code 3317 is generally associated with DEF dosing system performance or pressure control.

Cummins fault code 3319 commonly involves DEF pump, DEF pressure, or DEF dosing system operation.

Cummins fault code 3366 is commonly connected to DEF quality or SCR system efficiency.

Cummins fault code 3375 generally relates to DEF quality monitoring, SCR performance, or emissions inducement.

Cummins fault code 3376 is typically associated with DEF quality, SCR efficiency, or DEF/SCR system response.

Cummins fault code 3545 commonly points to an aftertreatment DEF/SCR system fault, often involving DEF dosing, system pressure, or aftertreatment performance monitoring.

Cummins fault code 4162 is generally related to aftertreatment system performance, DEF/SCR operation, or monitored emissions efficiency.

Cummins fault code 4277 is commonly associated with SCR/DEF system performance or emissions inducement status.

Cummins fault code 5865 commonly relates to SCR conversion efficiency or aftertreatment performance.

Cummins fault code 6767 is generally associated with modern aftertreatment monitoring, SCR performance, DEF dosing, or emissions system inducement.