SPN 132 FMI 0Engine
Engine Intake Air Temperature - Data Valid But Above Normal
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 132 / FMI 0
Category
Engine
Derate Risk
Yes
Regen Inhibit
No
Inducement Risk
No
Component Location: The intake air temperature sensor is typically located in the intake manifold or air inlet piping downstream of the charge air cooler.
Common Symptoms
- Black smoke from exhaust
- Loss of power and poor acceleration
- Poor fuel economy
- Engine derate or limp mode activation
- Check engine light illuminated
- Rough idle or hesitation
- Hard starting when hot
- Turbocharger boost pressure reduced
Root Causes
- Restricted air intake or clogged air filter Faulty charge air cooler (CAC) or intercooler Defective intake air temperature sensor Blocked or damaged CAC core reducing cooling efficiency Ambient temperature sensor reading incorrectly affecting IAT logic
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Derate Behavior
Power Derate
Yes
System Interactions
SPN 132 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 132 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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