What is CID 139:
CID 139 refers to an issue with the vehicle’s braking system, specifically the brake fluid pressure sensor. The ECM detects that the sensor is malfunctioning, potentially leading to improper brake performance and posing safety risks.
Why This Happens:
- Faulty brake fluid pressure sensor.
- Shorted or damaged wiring in the sensor circuit.
- Low brake fluid levels.
- Malfunctioning brake booster or valves.
- ECM misinterpreting the sensor’s data.
How to Fix It:
- Inspect the brake fluid pressure sensor for damage or malfunction.
- Test the sensor’s voltage and resistance to ensure proper functionality.
- Check for leaks and ensure brake fluid is at the correct level.
- Replace the faulty sensor or malfunctioning brake components.
- Perform a diagnostic check to ensure the brake system is operating correctly.
How to Avoid It Before It Happens:
- Regularly inspect the brake system and fluid levels.
- Keep connectors clean and free from corrosion.
- Perform routine diagnostics on the braking system.
- Replace brake fluid and components as needed.
- Clue’s safety management services track braking systems and prevent issues before they affect vehicle performance.
