SPN 1486 FMI 5ABS
Traction Control Warning Lamp - Current Below Normal/Open Circuit
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DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 1486 / FMI 5
Category
ABS
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: The traction control warning lamp is located in the instrument cluster, with wiring routed from the ABS control module to the dash.
Common Symptoms
- Traction control warning lamp not illuminating during bulb check
- Traction control warning lamp remains off constantly
- ABS warning lamp may also be affected
- Loss of traction control system indication to driver
- No other ABS system malfunction present
Root Causes
- Open circuit in warning lamp wiring harness Faulty warning lamp bulb or LED Damaged connector at ABS control module or dash cluster Failed ABS control module lamp driver circuit Corroded or loose ground connection for warning lamp circuit
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Derate Behavior
Power Derate
No
System Interactions
SPN 1486 FMI 5 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 1486 FMI 5 — 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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