Group 28 Engine Control Module (ECM) Diagnostic Trouble Codes (DTCs) ECM SPN 4375, Aftertreatment Diesel Exhaust Fluid Pump (DEF) Drive Percentage MID 128 PSID 121 80 Type of fault: FMI Description: Fault Condition: Possible Symptoms: Possible Cause:
FMI 0 • Data valid but above normal operational range - Most severe level • Circuit shorted + • MIL illuminated • No Aftertreatment Diesel Exhaust Fluid (DEF) dosing • Faulty harness • Faulty connector • Aftertreatment DEF pump assembly failure FMI 1 • Data valid but below normal operational range - Most severe level • Circuit shorted – • Open circuit • MIL illuminated • No Aftertreatment Diesel Exhaust Fluid (DEF) dosing • Faulty harness • Faulty connector • Aftertreatment DEF pump assembly failure FMI 3 • Voltage above normal, or shorted to high source • Circuit shorted + • MIL illuminated • No Aftertreatment Diesel Exhaust Fluid (DEF) dosing • Faulty harness • Faulty connector • Aftertreatment DEF pump assembly failure FMI 4 • Voltage below normal, or shorted to low source • Circuit shorted – • MIL illuminated • No Aftertreatment Diesel Exhaust Fluid (DEF) dosing • Faulty harness • Faulty connector • Aftertreatment DEF pump assembly failure FMI 5 • Current below normal or open circuit • Open circuit • MIL illuminated • No Aftertreatment Diesel Exhaust Fluid (DEF) dosing • Faulty harness • Faulty connector • Aftertreatment DEF pump assembly failure FMI 12 • Bad intelligent device or component • Open circuit • MIL illuminated • No Aftertreatment Diesel Exhaust Fluid (DEF) dosing • Faulty harness • Faulty connector • Aftertreatment DEF pump assembly failure FMI 14 • Special instructions • Voltage to pump out of range • MIL illuminated • No Aftertreatment Diesel Exhaust Fluid (DEF) dosing • Faulty harness • Faulty connector • Aftertreatment DEF pump assembly failure