SPN 1350 FMI 5ABS
ABS Modulator Valve - Front Right - Current Below Normal/Open Circuit
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 1350 / FMI 5
Category
ABS
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: The front right ABS modulator valve is integrated into the ABS modulator assembly mounted on the front axle or frame rail near the right front wheel.
Common Symptoms
- ABS warning lamp illuminated on dash
- ABS functionality disabled or limited
- Front right wheel may lock during hard braking
- Traction control system may be disabled
- Stability control system may be disabled
Root Causes
- Open circuit in wiring harness to front right ABS modulator valve Faulty front right ABS modulator valve solenoid Corroded or damaged ABS modulator valve connector Damaged ABS control module output driver Chafed or broken wires in chassis harness near wheel end
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Derate Behavior
Power Derate
No
System Interactions
SPN 1350 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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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 1350 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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