SPN 102 FMI 16Turbo
Boost Pressure - Data Valid But Above Normal Operating Range (Moderately Severe)
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DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 102 / FMI 16
Category
Turbo
Derate Risk
Yes
Regen Inhibit
No
Inducement Risk
No
Component Location: The turbocharger is mounted on the exhaust manifold, with the boost pressure sensor typically located in the intake manifold or air inlet piping.
Common Symptoms
- Black smoke from exhaust under load
- Excessive turbo boost pressure
- Engine derate or power loss
- Turbo whistle or abnormal noise
- Poor fuel economy
- Check engine light illuminated
Root Causes
- Wastegate actuator stuck closed or binding VGT mechanism seized or restricted Faulty boost pressure sensor reading high Exhaust restriction causing excessive backpressure ECM calibration issue or turbo control software fault
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Derate Behavior
Power Derate
Yes
System Interactions
SPN 102 FMI 16 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 102 FMI 16 — 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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