SPN 1347 FMI 13Turbo
Turbocharger Compressor Intake Pressure - Out Of Calibration
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DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 1347 / FMI 13
Category
Turbo
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: The turbocharger compressor intake pressure sensor is typically mounted at or near the turbocharger compressor inlet on the air intake side.
Common Symptoms
- Illuminated check engine light
- Loss of engine power or performance
- Reduced boost pressure under load
- Engine derate active
- Poor throttle response during acceleration
Root Causes
- Turbocharger compressor intake pressure sensor calibration drift Contamination or debris on sensor element Worn or damaged turbocharger compressor housing Air intake system restrictions or leaks Sensor mounting issues or installation errors
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Derate Behavior
Power Derate
No
System Interactions
SPN 1347 FMI 13 interacts with the following systems and may trigger cascading faults if not resolved promptly.
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.
Related Faults in This Category
OEM System Resources
ASE Training Resources
Diagnostic Engine v7.0
Related Diagnostic Articles
Deep-dive diagnostic page: SPN 1347 FMI 13 — 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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