Home › Codes › SPN 190 › FMI 16

SPN 190 FMI 16

Engine Speed — Value too high (moderately severe).
The reading is above normal at a middle warning level — more serious than FMI 15, less than FMI 0.

What the SPN covers: Engine RPM, usually calculated from the crankshaft and/or camshaft position sensors. More on SPN 190.

What FMI 16 usually points to: A developing over-condition that often precedes a derate. More on FMI 16.

Severity

HIGH — limit use, diagnose now

An overspeed or lost speed signal can cause stalling or engine damage. Investigate before running.

Likely causes

  1. Overspeed (downhill in too low a gear, runaway)
  2. Crank or cam sensor fault
  3. Damaged tone wheel
  4. Wiring or connector issue

Checks & fixes (easiest first)

  1. Check whether the fault logged during an actual overspeed
  2. Inspect crank and cam sensors and connectors
  3. Check SPN 636/637 codes
  4. Verify sensor air gap and tone wheel condition

FAQ

What does SPN 190 FMI 16 mean?

Engine Speed — value too high (moderately severe). The reading is above normal at a middle warning level — more serious than FMI 15, less than FMI 0.

Is SPN 190 FMI 16 serious?

An overspeed or lost speed signal can cause stalling or engine damage. Investigate before running.

What should I check first for SPN 190 FMI 16?

Check whether the fault logged during an actual overspeed; Inspect crank and cam sensors and connectors; Check SPN 636/637 codes.