SPN 113 FMI 2CoolingMedium
Engine Coolant Pressure — Erratic
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 113 / FMI 2
Category
Cooling
Fault Type
sensor
FMI Category
data erratic
Severity
Medium
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: Coolant pressure sensor — on cooling system, typically near water pump
Common Symptoms
- Coolant pressure sensor reading erratic
- Cooling system pressure monitoring affected
- Possible air in cooling system
Root Causes
- Air in cooling system
- Coolant pressure sensor failed
- Wiring harness damage
- Cooling system leak
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Derate Behavior
Power Derate
No
Mileage / Regen Notes
Sensor failure common at 200k–400k miles.
System Interactions
SPN 113 FMI 2 interacts with the following systems and may trigger cascading faults if not resolved promptly.
TSB Reference: Cummins TSB 4021420 — Coolant Pressure Sensor Diagnosis
Common Diagnostic Mistakes
Replacing the sensor without verifying wiring continuity and supply voltage first.
Clearing codes without identifying and resolving the root cause — the fault will return.
Ignoring related active faults — cascading faults often share a root cause.
Skipping the connector inspection — corrosion and damaged pins are a leading cause of sensor faults.
Condemning the ECM before exhausting all wiring and component tests.
OEM Notes
Cummins
X15: Check deaeration tank for air pockets.
Detroit
DD15: Check coolant filter for restriction.
Volvo
MP8: Check deaeration tank cap for proper sealing.
Related Faults in This Category
OEM System Resources
ASE Training Resources
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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 113 FMI 2 — Full FSM Sequence & Repair Steps — includes wiring notes, sensor specs, and gated repair procedures.
Authority References
Diagnostic procedures on this page are informed by OEM service literature and industry standards.
Cummins QuickServe OnlineOfficial Cummins service manuals, fault code lookup, and TSB database.Detroit Diesel DiagnoCentralDetroit Diesel diagnostic procedures, DDDL documentation, and service literature.PACCAR MX Engine ServicePACCAR MX-11 and MX-13 engine service documentation and DAVIE diagnostic guides.Volvo/Mack Tech ToolVolvo and Mack engine fault code reference and PTT/Tech Tool diagnostic procedures.ASE — Diesel Truck Technician CertificationNational Institute for Automotive Service Excellence — T2 Diesel Engines certification standards.EPA Aftertreatment & Emissions GuidelinesU.S. EPA heavy-duty diesel aftertreatment compliance, DPF/SCR regulations, and NOx standards.
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