SPN 3357 FMI 11ABS
ABS Trailer Interface - Root Cause Not Known
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Connector Pinout — in guided session
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Overview
Fault Code
SPN 3357 / FMI 11
Category
ABS
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: The ABS trailer interface consists of the tractor-mounted ABS ECU and the electrical connection point at the rear of the tractor frame near the gladhand assembly.
Common Symptoms
- ABS warning light illuminated on dash
- Trailer ABS malfunction indicator active
- Intermittent loss of trailer ABS functionality
- Communication error between tractor and trailer ABS
- No ABS modulation detected on trailer axles
Root Causes
- Intermittent wiring connection in trailer ABS harness Corroded or damaged trailer ABS electrical connector Faulty trailer ABS ECU or controller Gladhand electrical connection issue Intermittent power supply to trailer ABS system
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Derate Behavior
Power Derate
No
System Interactions
SPN 3357 FMI 11 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 3357 FMI 11 — 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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