JDL 000841.12 – Control Unit, Faulty GPS Signal

JDL 000841.12 (JDL 841.12)

Code: 000841.12

Shortcode: 841.12


This diagnostic trouble code, JDL 000841.12, is triggered when the control unit does not recognize a valid internal GPS signal. This fault indicates issues with the GPS module or its communication with the control unit.


When this error code is triggered, the equipment may lose GPS functionality, affecting navigation, tracking, and any operations dependent on GPS data.


Inspect GPS Antenna and Connections:

  • Check the GPS antenna for any signs of damage or obstruction. Ensure it has a clear view of the sky.
  • Verify that all connections between the GPS antenna and the control unit are secure and free from corrosion.

Update Control Unit and GPS Module Software:

  • Ensure that the control unit and GPS module software are up-to-date. Install any available updates to improve GPS signal recognition and system stability.

Reset GPS Module:

  • Perform a reset of the GPS module by disconnecting and reconnecting the power supply. This can sometimes resolve temporary signal issues.

Consult Technical Support:

  • If the issue persists, consult the manufacturer’s technical support for further assistance.
  • Provide the diagnostic trouble code and any relevant information gathered during the inspection.


GPS signal issues can be caused by environmental factors such as dense foliage, tall buildings, or atmospheric conditions. Regular inspection and maintenance of the GPS system can help ensure reliable operation.

Control Units: John Deere

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