What does Paccar PX fault code 3142 mean?

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AftertreatmentPaccar PX Diesel ECM

3142

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

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System

Paccar PX Aftertreatment

Paccar PX ECM Service

Diagnostic Overview

Cummins fault code 3142 generally relates to DEF dosing, DEF system pressure, or SCR performance. The ECM may be detecting that the DEF system cannot deliver the commanded amount of fluid or that the SCR system is not responding correctly. Common causes include a plugged DEF filter, failed DEF pump, crystallized DEF lines, blocked doser, contaminated DEF, wiring issues, or inaccurate NOx sensor feedback. The repair path should include checking DEF quality, pump pressure, doser operation, and any related SCR efficiency or inducement codes.

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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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