Detailed guide for SPN 102 FMI 10
Back to top ↑What SPN 102 FMI 10 means
SPN 102 identifies intake manifold pressure, commonly referred to as boost or manifold pressure.
FMI 10 indicates an abnormal rate of change. This means the pressure signal or boost response is not changing at the rate expected by the engine controller.
What you may notice
Depending on the engine manufacturer and calibration, the check-engine light may illuminate and engine performance may be reduced.
On some Cummins applications, SPN 102 FMI 10 can be associated with slow variable geometry turbocharger response.
That application-specific interpretation should not be assumed for every engine using SPN 102 FMI 10.
What to check first
Check for related turbocharger actuator, intake manifold pressure sensor, barometric pressure or air-system faults.
Inspect the entire intake and charge-air system for loose clamps, damaged hoses, charge-air-cooler leaks or restrictions.
Use live diagnostic data to compare commanded turbocharger operation with actual intake manifold pressure response.
If the pressure reading itself appears implausible, inspect the intake manifold pressure sensor, connector and wiring.
Important
SPN 102 identifies the monitored pressure parameter, while the exact FMI 10 diagnostic logic varies by engine manufacturer and calibration.
Follow the OEM troubleshooting procedure before replacing the turbocharger, actuator or pressure sensor.
Mechanic community notes for SPN 102 FMI 10
Back to top ↑Real-world tips from technicians. Submissions are moderated to keep spam and “my cousin fixed it with duct tape” content out.
Share your fix / advice
Keep it useful: symptoms, what you checked, what fixed it, and whether the code stayed inactive after a drive cycle.