RPT 000186.05 – Rear PTO Speed Sensor, Open Circuit

RPT 000186.05 (RPT 186.05)

Code: 000186.05

Shortcode: 186.05


This diagnostic trouble code, RPT 000186.05, is generated when the RPT control software detects that the voltage at the output to the rear PTO speed sensor is too high, indicating an open circuit. An open circuit means that there is a break or disconnection in the electrical pathway, preventing the sensor from functioning correctly.


When this error is detected, the functionality of the rear PTO is significantly limited or entirely non-functional, affecting the operation of the connected implement.


Inspect Rear PTO Speed Sensor Wiring:

  • Check the wiring to the rear PTO speed sensor for any signs of an open circuit.
  • Repair or replace any damaged wires or connectors.

Verify Sensor Connections:

  • Ensure all connections to the rear PTO speed sensor are secure and free from corrosion or damage.
  • Reconnect any loose wires and clean any corroded connectors.

Test Sensor and Circuit:

  • Use diagnostic tools to test the rear PTO speed sensor and the associated circuit for continuity.
  • Replace the sensor if it is found to be faulty.

Update Control Software:

  • Ensure that the control software is updated to the latest version.
  • Apply any available patches or updates that address open circuit issues.

Consult Technical Support:

  • If the issue remains unresolved, consult with technical support or the equipment manufacturer for further assistance.
  • Provide detailed diagnostic information to help identify the root cause.

Monitor System Performance:

  • After making the necessary repairs, monitor the rear PTO system to ensure it operates correctly.
  • Keep detailed logs of any further issues to aid in ongoing diagnostics.


An open circuit in the rear PTO speed sensor can significantly impair the performance of the PTO system. Regular inspections and maintenance of the PTO sensor and circuit are essential to prevent such issues.

Control Units: John Deere

John Deere Parts
John Deere Logo