Diagnostic Overview
Cummins fault code 3714 is typically a more severe derate or inducement fault than 3712. It indicates that the ECM has entered a protective or emissions-related power limitation because the root aftertreatment problem has remained active or unresolved. Common triggers include DEF quality faults, SCR efficiency faults, NOx sensor faults, DPF restriction, failed regeneration, or DEF dosing problems. This code should be treated as a result code; the root cause is usually found in the other active Cummins fault codes.