What is MID 131 & How to Solve It?

Learn what MID 131 means, the common causes behind it, and how to fix it. Follow our simple guide to get your equipment back to normal operation.

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Table of Content

What is MID 131:

MID 131 refers to an issue with the Fuel Injector Control Module (FICM). This fault indicates that the ECM has detected a malfunction in the fuel injector control system, which could lead to improper fuel injection and poor engine performance.

Why This Happens:

  • Faulty Fuel Injector Control Module (FICM).
  • Shorted or damaged wiring in the FICM circuit.
  • Loose or corroded connectors.
  • Power supply issues affecting the FICM.
  • ECM failure to interpret the FICM’s signal properly.

How to Fix It:

  1. Inspect the Fuel Injector Control Module (FICM) and wiring for damage.
  2. Test the FICM to ensure proper voltage and functionality.
  3. Check the connectors for tightness and cleanliness.
  4. Replace the faulty FICM if necessary.
  5. Ensure proper power supply and communication between the FICM and ECM.


How to Avoid It Before It Happens:

  • Regularly inspect the FICM and wiring for damage.
  • Keep connectors clean and free from corrosion.
  • Perform routine diagnostic checks to monitor FICM health.
  • Ensure stable power supply to the FICM and ECM.
  • Clue’s Fuel Management services help monitor injector control systems to prevent performance issues.

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