Cummins Fault Code 4677 — Aftertreatment DEF Tank Level Fault / Low

Cummins Engines · 4677

Aftertreatment DEF Tank Level Fault / Low

What this code means

Aftertreatment 1 Diesel Exhaust Fluid Tank Level - Abnormal Update Rate (DEF tank level critically low per WholeFleet; 5 mph derate)

Applies to: all electronic engines.

Possible causes / checks (from the source)

SPN 1761, FMI 9

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Source: 30-Minute DPF Clean — Cummins fault code list; cross-checked vs WholeFleet Cummins fault code list. Cross-checked in two independent sources. Compiled 2026-10-30. No manufacturer affiliation.