SPN 2564 FMI 0Turbo
Turbocharger Boost Control Position Sensor A Circuit Low
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DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 2564 / FMI 0
Category
Turbo
Derate Risk
Possible
Regen Inhibit
No
Inducement Risk
No
Component Location: The turbocharger boost control position sensor is mounted on the turbocharger variable geometry actuator assembly on the exhaust side of the engine.
Common Symptoms
- Check engine light illuminated
- Reduced engine power or derate
- Poor turbocharger boost response
- Black smoke under acceleration
- Turbo actuator not responding properly
Root Causes
- Faulty turbocharger boost control position sensor Wiring harness damage or chafing to ground Corroded or loose connector at position sensor Failed turbocharger electronic actuator ECM internal fault
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Derate Behavior
Power Derate
Possible
System Interactions
SPN 2564 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
Diagnostic Engine v7.0
Related Diagnostic Articles
Deep-dive diagnostic page: SPN 2564 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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