SPN 11 FMI 0Variable Valve TimingMedium
Intake Camshaft Position Timing - Over-Advanced (Bank 1)
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 11 / FMI 0
Category
Variable Valve Timing
Severity
Medium
Regen Inhibit
No
Inducement Risk
No
Component Location: The intake camshaft position actuator is located at the front of the engine on the intake camshaft on bank 1.
Common Symptoms
- MIL illuminated with SPN 11 FMI 0 stored
- Rough or erratic idle at cold start
- Reduced engine power or sluggish acceleration
- Increased fuel consumption
- Hard starting or extended crank time
- Audible engine rattle or ticking at startup
Root Causes
- Camshaft phaser stuck or slow to respond due to sludge or oil varnish buildup Low engine oil pressure insufficient to actuate VVT phaser correctly Oil control valve (OCV) solenoid stuck open or contaminated Stretched or worn timing chain causing excessive slack and retard offset ECM calibration or VVT duty cycle command error
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System Interactions
SPN 11 FMI 0 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.
Related Faults in This Category
OEM System Resources
ASE Training Resources
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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 11 FMI 0 — 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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