SPN 1351 FMI 6ABS
ABS Modulator Valve - Rear Left - Current Above Normal/Short Circuit
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 1351 / FMI 6
Category
ABS
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: The rear left ABS modulator valve is mounted on the rear axle ABS valve block assembly, typically near the frame rail on the left side.
Common Symptoms
- ABS malfunction indicator lamp illuminated
- Rear left wheel ABS function disabled
- Reduced braking performance on rear left wheel
- Brake pedal pulsation
- ABS system deactivated
- Traction control disabled
Root Causes
- Shorted ABS modulator valve coil windings Damaged wiring harness or chafed wires to rear left modulator valve Moisture or corrosion in ABS valve connector causing short circuit Failed ABS ECU output driver circuit Pinched or crushed cable near valve or frame mounting points
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Derate Behavior
Power Derate
No
System Interactions
SPN 1351 FMI 6 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 1351 FMI 6 — 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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