What is CID 4 & How to Solve It?

What is CID 4:

CID 4 refers to an issue with the braking system. The ECM detects a fault within the system, such as a malfunctioning brake pressure sensor, which can cause problems with braking efficiency, leading to delayed stopping or safety risks.

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Why This Happens:

• Faulty brake pressure sensor.
  
• Damaged or shorted wiring in the brake control circuit.
  
• Loose or corroded brake system connectors.
  
• Low brake fluid levels.
  
• ECM failure to correctly process brake sensor data.
  
  

How to Fix It:

1. Inspect the brake pressure sensor and its wiring.
   
2. Test the sensor’s voltage and resistance to ensure proper function.
   
3. Check for leaks or low brake fluid.
   
4. Replace faulty sensors or components as needed.
   
5. Reprogram the ECM if required.
   
   

How to Avoid It Before It Happens:

• Perform regular brake system checks and fluid level monitoring.
  
• Keep connectors clean and free from corrosion.
  
• Ensure proper brake fluid levels and system integrity.
  
• Clue’s safety management services monitor braking systems and alert you to early sensor malfunctions to prevent brake failure.