DerateDetroit Diesel Diesel ECM

SPN 110 FMI 15

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Engine protection and emissions inducement power-limiting faults.

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Active derate — truck is losing power now

System

Detroit Diesel Derate

Detroit Diesel ECM Service

Diagnostic Overview

Detroit SPN 110 FMI 15 generally indicates engine coolant temperature is above normal but at the least severe level. It is an early warning that cooling system performance is not keeping up. If ignored, it can progress to more severe coolant temperature faults and derate.

Likely Causes

Low coolant level, dirty radiator, weak fan operation, thermostat beginning to fail, coolant flow restriction, heavy load operation, or inaccurate temperature sensor.

What To Check First

Check coolant level, inspect for leaks, clean radiator and charge-air cooler fins, verify fan engagement, compare actual temperature to live data, and look for SPN 110 FMI 16 or FMI 0 companion faults. Verify final definition in Detroit DiagnosticLink because FMI meaning can vary by engine year, ACM/MCM calibration, and emissions level.

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Internal Linking

Related Derate Fault Codes

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Flash Code 44

Detroit Flash Code 44 is commonly used as a warning or shutdown-related code depending on the DDEC generation and engine configuration.

Flash Code 45

Detroit Flash Code 45 should be handled as an older Detroit/DDEC flash-code style warning that may trigger reduced power or protection logic depending on application.

PID 404

Detroit PID 404 is commonly tied to an older parameter identifier used in DDEC-era diagnostics and may appear in derate-related fault lists.

SPN 1001

Detroit SPN 1001 may appear as a derate-related status or protection input depending on calibration.

SPN 1001 FMI 0

Detroit SPN 1001 FMI 0 indicates the monitored SPN 1001 condition is above the most severe threshold or outside the normal operating limit, depending on the exact Detroit definition.

SPN 1001 FMI 8

Detroit SPN 1001 FMI 8 indicates an abnormal frequency, pulse width, or update-rate type fault for the SPN 1001 signal.

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