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SPN 102 FMI 2

Intake Manifold #1 Pressure (Boost) — Data erratic, intermittent, or incorrect.
The signal jumps around, drops in and out, or disagrees with other information the controller has.

What the SPN covers: Boost pressure in the intake manifold after the turbocharger and charge air cooler. More on SPN 102.

What FMI 2 usually points to: Loose or corroded connectors, chafed wiring, a failing sensor, or two redundant sensors that do not agree. More on FMI 2.

Severity

MEDIUM — fix soon

Low boost means low power and more smoke; high boost can overstress the engine. Usually drivable carefully to a shop.

Likely causes

  1. Boost leak at charge-air cooler or hoses
  2. Turbo or VGT actuator problem
  3. Clogged air filter
  4. Faulty boost sensor or plugged sensor port
  5. Exhaust restriction (DPF)

Checks & fixes (easiest first)

  1. Pressure-test the charge-air system for leaks
  2. Inspect CAC boots and clamps
  3. Check the boost sensor for oil/soot buildup
  4. Compare boost to barometric pressure with the key on, engine off
  5. Check VGT and DPF codes

FAQ

What does SPN 102 FMI 2 mean?

Intake Manifold #1 Pressure (Boost) — data erratic, intermittent, or incorrect. The signal jumps around, drops in and out, or disagrees with other information the controller has.

Is SPN 102 FMI 2 serious?

Low boost means low power and more smoke; high boost can overstress the engine. Usually drivable carefully to a shop.

What should I check first for SPN 102 FMI 2?

Pressure-test the charge-air system for leaks; Inspect CAC boots and clamps; Check the boost sensor for oil/soot buildup.