SPN 1484 FMI 7ABS
Stability Control - Mechanical System Not Responding
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 1484 / FMI 7
Category
ABS
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: Stability control valves and modulators are mounted on the vehicle frame rails near the ABS valve assembly.
Common Symptoms
- ABS warning light illuminated on dash
- Stability control warning light active
- Loss of stability control functionality
- ABS system disabled or limited function
- Vehicle may pull or handle differently during braking
- Possible traction control disabled message
Root Causes
- Faulty stability control valve or modulator Air supply issue to stability control system Mechanical binding or seized stability control actuator ECU commanding signal not reaching valve due to wiring fault Failed ABS modulator valve assembly
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Derate Behavior
Power Derate
No
System Interactions
SPN 1484 FMI 7 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 1484 FMI 7 — 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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