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SPN 111 FMI 17

Coolant Level — Value too low (least severe).
The reading is below normal, but only at the lowest warning level.

What the SPN covers: Coolant level in the expansion tank or radiator, from a level probe or switch. More on SPN 111.

What FMI 17 usually points to: An early warning: slightly low level or pressure, or a sensor starting to drift low. More on FMI 17.

Severity

HIGH — limit use, diagnose now

Low coolant can lead to overheating and head damage. Top off and find the leak before working hard.

Likely causes

  1. Coolant leak (hoses, radiator, water pump, EGR cooler)
  2. Coolant level sensor dirty or failed
  3. Wiring fault

Checks & fixes (easiest first)

  1. Check actual level when cold
  2. Look for external leaks and white exhaust smoke
  3. Clean or test the level probe
  4. Pressure-test the cooling system

FAQ

What does SPN 111 FMI 17 mean?

Coolant Level — value too low (least severe). The reading is below normal, but only at the lowest warning level.

Is SPN 111 FMI 17 serious?

Low coolant can lead to overheating and head damage. Top off and find the leak before working hard.

What should I check first for SPN 111 FMI 17?

Check actual level when cold; Look for external leaks and white exhaust smoke; Clean or test the level probe.