SPN 1072 FMI 1EGR
Engine Exhaust Gas Recirculation 1 Differential Pressure - Data Valid But Below Normal
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Overview
Fault Code
SPN 1072 / FMI 1
Category
EGR
Derate Risk
Possible
Regen Inhibit
No
Inducement Risk
No
Component Location: EGR differential pressure sensor is mounted on or near the EGR cooler or EGR mixer, typically on the engine's intake/exhaust side, connected via two pressure sensing ports and tubes.
Common Symptoms
- Check engine light illuminated
- DPF regeneration frequency increased
- Poor fuel economy
- Black smoke from exhaust
- Reduced engine power
- Rough idle or low power at low RPM
Root Causes
- Clogged or restricted EGR differential pressure sensor ports or tubing Failed EGR differential pressure sensor reading low EGR valve stuck open causing excessive flow and pressure drop inversion Carbon buildup in EGR cooler or passages causing abnormal delta-P readings Collapsed or kinked pressure sensing hose/tube between sensor and EGR EGR differential pressure sensor out of calibration or failed low Exhaust leak upstream of EGR differential pressure tap affecting reading ECM software or calibration issue misinterpreting sensor signal
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Derate Behavior
Power Derate
Possible
System Interactions
SPN 1072 FMI 1 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 1072 FMI 1 — 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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