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SPN 111 FMI 1Heavy truck
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SPN 111 FMI 1 — SPN 111 FMI 1 — Low level

J1939 SPN 111 with FMI 1: the module is reporting a low-level condition. Check the OEM manual for the exact parameter tied to SPN 111 on your engine.

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Often associated codes

Likely causes

  • Monitored fluid level below the minimum threshold
  • Faulty level sensor or stuck float
  • Oxidized harness or connector skewing the reading

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Recommended checks

  1. 1

    Check and restore the fluid level involved

  2. 2

    Inspect the level sensor and its connector

  3. 3

    Confirm the FMI with a J1939 scan tool before replacing parts

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Parts to replace