What is MID 77 & How to Solve It?

What is MID 77:

MID 77 is linked to the tire pressure monitoring system (TPMS). It warns about underinflation, sensor failure, or system communication errors.

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Why This Happens:

• Faulty TPMS sensor
  
• Dead battery in the sensor
  
• Lost signal from sensor to module
  
• Sensor miscalibration
  
• Controller software issue
  
  

How to Fix It:

1. Verify tire pressures and reset system.
   
2. Replace TPMS sensor batteries if possible.
   
3. Relearn or recalibrate the system.
   
4. Repair or replace faulty sensors.
   
5. Update TPMS control software.
   
   

How to Avoid It Before It Happens:

• Check tire pressure monthly.
  
• Replace TPMS sensors every 5–7 years.
  
• Calibrate after tire rotation or replacement.
  
• Protect sensor valves from corrosion.
  
• Clue’s inventory management can track TPMS sensor replacements and lifespan across fleet vehicles.