SPN 1627 FMI 31ABS
ABS Trailer System - Incompatible Configuration
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 1627 / FMI 31
Category
ABS
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: ABS ECUs are mounted on the tractor chassis rail and trailer frame, with communication via the J1939 CAN bus through the ABS trailer connector.
Common Symptoms
- ABS warning lamp illuminated on dash
- Trailer ABS malfunction indicator active
- ABS system may default to non-ABS braking
- Communication error between tractor and trailer ABS
- Possible ABS system deactivation
Root Causes
- Mismatched ABS software configuration between tractor and trailer Incompatible ABS ECU types or versions between tractor and trailer Incorrect trailer ABS configuration parameters programmed Trailer ABS system not recognized by tractor ABS controller Corrupted ABS configuration data in tractor or trailer ECU
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Derate Behavior
Power Derate
No
System Interactions
SPN 1627 FMI 31 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
ASE Training Resources
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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 1627 FMI 31 — 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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