SPN 2230 FMI 0Sensors
Barometric Pressure Circuit High
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 2230 / FMI 0
Category
Sensors
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: Barometric pressure sensor is typically integrated into the ECM or mounted on the intake manifold near the air intake system.
Common Symptoms
- Check engine light illuminated
- Engine derate or reduced power
- Poor performance at higher elevations
- Excessive black smoke under load
- Rough idle or hesitation on acceleration
Root Causes
- Faulty barometric pressure sensor Damaged or corroded wiring to barometric pressure sensor Water intrusion in sensor connector ECM internal fault affecting sensor circuit Short to high voltage in sensor circuit
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Derate Behavior
Power Derate
No
System Interactions
SPN 2230 FMI 0 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.
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OEM System Resources
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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 2230 FMI 0 — 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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