PTH 521991.16 – Controller Temperature Data Valid but Above Normal Operating Range – Moderately Severe Level

PTH 521991.16 (PTH )

Code: 521991.16



This fault code indicates that the PTH (Power Train Hydrostatic) controller temperature is moderately high, exceeding the normal operational range but not at a critical level. This can be due to moderate overheating or insufficient cooling.


When this error is detected, the equipment may experience reduced performance or efficiency. The system logs the fault and may take corrective actions to reduce the temperature.


Replace Controller:

  • The primary recommendation is to replace the PTH controller to ensure normal operation.

Check Cooling System:

  • Ensure the cooling system is functioning properly.
  • Check for obstructions or blockages in cooling vents and fans.
  • Clean or replace air filters if necessary.

Verify Environmental Conditions:

  • Ensure the equipment is operating within the specified temperature range.
  • Avoid excessive heat exposure or direct sunlight.

Monitor System Performance:

  • After replacing the controller, monitor the system to ensure normal operation and that the fault does not reappear.

Consult Technical Support:

  • If the issue persists, contact technical support for further diagnostics and assistance.


Regular maintenance and inspection of the cooling system can prevent such issues. Ensure proper ventilation around the equipment and maintain a clean environment to avoid overheating.

Control Units: John Deere

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