CCU 001086.03 – Air Brake Pressure Sensor Circuit Voltage High

CCU 001086.03 (CCU 1086.03)

Code: 001086.03

Shortcode: 1086.03


This fault code is set off when the voltage in the air brake pressure sensor circuit is higher than normal, or if the sensor is shorted to a high voltage source. High voltage can result in inaccurate pressure readings, which are critical for the safe operation of the vehicle’s air brake system.


The control unit degrades the functionality of the brake system to minimize risks associated with potentially unreliable brake pressure readings.


  • Sensor and Circuit Inspection: Inspect the air brake pressure sensor and its circuit for any signs of short circuits or damage that could be causing the high voltage readings. Replace or repair as needed.
  • Check Voltage Levels: Use diagnostic tools to measure voltage levels at the sensor to pinpoint the source of the high voltage.
  • Review Electrical Connections: Ensure that all electrical connections are secure and free of corrosion or other damage that could affect voltage levels.
  • Replace Faulty Components: If a component within the circuit is found to be faulty, replace it to ensure proper function and accurate readings.
  • Calibration and System Testing: After repairs, recalibrate the sensor and test the brake system to confirm that all components function correctly and safely under normal operation conditions.


Regular maintenance of the air brake system, including sensor checks and voltage inspections, is essential for ensuring safety and reliability, especially in vehicles that rely heavily on pneumatic braking systems.

Control Units: John Deere

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