ETC 000871.03 – B130 Sensor for Refrigerant Pressure, Voltage Too High

ETC 000871.03 (ETC 871.03)

Code: 000871.03

Shortcode: 871.03


The error code ETC 000871.03 is triggered when the control unit measures a voltage in excess of 5 volts at the signal input for the refrigerant pressure sensor (B130, lead 2019). This high voltage indicates a short to a supply lead somewhere in the circuit, which can disrupt the accurate reading of refrigerant pressure.


When this fault is detected, the control unit may disable the air conditioning system or reduce its efficiency to prevent damage to the refrigerant system and ensure safety.


Inspect Electrical Connections:

  • Check for Shorts: Examine the wiring and connectors for the B130 sensor for signs of shorts to the power supply. Look for damaged insulation, pinched wires, or loose connections.
  • Measure Voltage: Use a multimeter to measure the voltage at the sensor input. Ensure it is within the normal operating range (typically below 5 volts).

Sensor and Circuit Testing:

  • Test the Sensor: Verify the operation of the B130 refrigerant pressure sensor using diagnostic tools. Replace the sensor if it is found to be faulty.
  • Inspect the Circuit: Trace the circuit from the control unit to the sensor to identify any points where the wiring might be exposed or damaged.

Repair or Replace Components:

  • Repair Damaged Wires: Fix any identified shorts or damaged wiring. Ensure all connections are secure and properly insulated.
  • Replace Faulty Components: Replace the B130 sensor or any other components if they are found to be contributing to the high voltage condition.


Regular inspection and maintenance of the air conditioning system’s electrical components can help prevent voltage-related issues. Ensuring proper routing and securing of wires can reduce the risk of shorts and enhance the reliability of the system.

Control Units: John Deere

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