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SPN 105 FMI 0

Intake Manifold #1 Temperature — Value too high (most severe).
The reading is valid but far above the normal operating range — high enough that the controller treats it as the most serious level of 'too high'.

What the SPN covers: Temperature of the air entering the cylinders after the charge air cooler. More on SPN 105.

What FMI 0 usually points to: A real over-condition (over-temperature, over-pressure, overspeed) or a sensor reporting a believable but wrong high value. More on FMI 0.

Severity

MEDIUM — fix soon

High intake temps reduce power and can lead to a derate. Drivable with care.

Likely causes

  1. Dirty or blocked charge-air cooler fins
  2. Charge-air cooler leak
  3. Fan not engaging
  4. EGR cooler problem raising intake temperature
  5. Sensor or wiring fault

Checks & fixes (easiest first)

  1. Clean the CAC and radiator stack
  2. Verify fan engagement
  3. Pressure-test the CAC
  4. Compare the sensor to ambient after a cold soak

FAQ

What does SPN 105 FMI 0 mean?

Intake Manifold #1 Temperature — value too high (most severe). The reading is valid but far above the normal operating range — high enough that the controller treats it as the most serious level of 'too high'.

Is SPN 105 FMI 0 serious?

High intake temps reduce power and can lead to a derate. Drivable with care.

What should I check first for SPN 105 FMI 0?

Clean the CAC and radiator stack; Verify fan engagement; Pressure-test the CAC.