What is CID 99 & How to Solve It?

What is CID 99:

CID 99 refers to an issue with the vehicle's fuel system. Specifically, it relates to the fuel pressure sensor circuit. The ECM detects that the signal from the sensor is out of range, which can lead to incorrect fuel pressure readings and engine performance issues.

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Why This Happens:

• Faulty fuel pressure sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• Loose or corroded sensor connectors.
  
• Low fuel pressure due to a malfunctioning fuel pump.
  
• ECM failure to interpret the sensor’s signal.
  
  

How to Fix It:

1. Inspect the fuel pressure sensor and wiring for visible damage or malfunction.
   
2. Test the sensor’s voltage and resistance to verify it’s working properly.
   
3. Check connectors for tightness and cleanliness.
   
4. Replace the faulty fuel pressure sensor if necessary.
   
5. Inspect the fuel system for low pressure or malfunctioning fuel pumps.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the fuel pressure sensor and wiring.
  
• Perform routine fuel system maintenance.
  
• Keep connectors clean and free from corrosion.
  
• Perform diagnostic checks to monitor fuel pressure.
  
• Clue’s fuel management services track fuel pressure systems and prevent issues before they affect engine operation.