Caterpillar Fault Code

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3714-0

Severe Engine Derate / Countdown

System

Aftertreatment / DEF

Symptom

Severe Engine Derate / Countdown

Diagnosis & fix steps

LOGIC: SCR Operator Inducement Severe Derate. ACTION: Check DEF quality with a refractometer (must read 32.5%). Inspect DEF injector nozzle for crystal buildup and perform a manual SCR system dosing test.

Red Seal field insights

This is a safety inducement lockout triggered after downstream NOx reduction fails or DEF quality stays low past the operational grace period.

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