Caterpillar Fault Code
Free · no signupE1389 FMI 3
Level 3 Inducement / Severe Engine Derate
System
Emissions / SCR
Symptom
Level 3 Inducement / Severe Engine Derate
Diagnosis & fix steps
LOGIC: Aftertreatment SCR Operator Inducement Severity Level 3 Active.
ACTION: Check for active root-cause DEF dosing pressure or NOx sensor codes using Cat ET. Verify DEF pump delivery pressure (~900 kPa) and execute an automated SCR system recovery reset.
Red Seal field insights
Regulatory Lockout: The ECM caps engine torque at 50% and limits maximum ground speed; requires clearing all underlying aftertreatment faults and executing software override routines.
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