SPN 102 FMI 6Turbo / BoostMedium
Intake Manifold Pressure Sensor - Current Above Normal
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Overview
Fault Code
SPN 102 / FMI 6
Category
Turbo / Boost
Severity
Medium
Derate Risk
Sometimes
Regen Inhibit
No
Inducement Risk
No
Component Location: Intake manifold pressure sensor is mounted directly on the intake manifold, typically on the top or side of the manifold near the turbocharger outlet.
Common Symptoms
- Check engine light illuminated
- Boost pressure reading stuck high or erratic on dash
- Engine derate or reduced power
- Poor throttle response
- Black or excessive exhaust smoke under load
- Turbocharger over-boost or under-boost conditions
- Engine may go into limp mode
Root Causes
- Short to voltage on the MAP sensor signal wire causing current above normal
- Failed intake manifold pressure sensor with internal short
- Chafed or damaged wiring harness causing signal wire to contact power wire or chassis
- Corroded or moisture-contaminated sensor connector
- Faulty ECM/ECU output driver (rare)
- Incorrect sensor installed (wrong range or part number)
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Derate Behavior
Power Derate
Sometimes
Mileage / Regen Notes
SPN 102 FMI 6 typically inhibits active DPF regeneration because accurate boost/intake pressure is required to control regen fueling and exhaust temperatures safely. Regen may be suspended until fault is resolved.
System Interactions
SPN 102 FMI 6 interacts with the following systems and may trigger cascading faults if not resolved promptly.
TSB Reference: Boost sensor TSB
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 6 — 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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