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Cummins Engines · 6255
Engine Protection Torque Derate

What this code means

Engine Protection Torque Derate - Data Valid But Above Normal Operating Range - Least Severe Level (variable derate, up to engine shutdown per WholeFleet; diagnose root-cause faults first)

Applies to: all electronic engines.

Possible causes / checks (from the source)

SPN 1569, FMI 15

Need the part?

If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (6255), machine model and serial number — we quote genuine and OEM replacement parts for export.

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.