Cummins Fault Code
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High Exhaust Temp / Derate
System
Emissions
Symptom
High Exhaust Temp / Derate
Diagnosis & fix steps
LOGIC: EGR Temperature Above Normal (Severe).
ACTION: Check the EGR cooler for internal scaling or coolant flow restriction.
Red Seal field insights
Logic: EGR gas isn't being cooled before re-entry.
FIX: Usually a plugged EGR cooler.
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