PTH 000168.01 – Supply Power Valid but Below Normal Operational Range – Most Severe Level

PTH 000168.01 (PTH 168.01)

Code: 000168.01

Shortcode: 168.01


This fault code indicates that the supply power is below the normal operating range at the most severe level. This can be due to battery issues, alternator problems, or wiring faults affecting the power train hydrostatic control unit.


When this error is detected, the equipment may experience electrical issues, potentially leading to unstable operation or failure to start. The system might shut down or enter a safe mode to prevent damage.


Battery Inspection Test:

  • Check the battery for proper charge and condition.
  • Ensure there are no signs of damage, corrosion, or loose connections.
  • Replace the battery if it is found to be faulty.

Inspect Alternator (G02) or G02 Alternator – EEC:

  • Check the alternator for proper operation and voltage output.
  • Ensure there are no signs of damage or wear.
  • Verify all electrical connections are secure and free from corrosion.

Test Power Train Hydrostatic Control Unit (PTH):

  • Perform diagnostic tests on the control unit to identify any faults.
  • Ensure all electrical connections to the control unit are tight and free from corrosion.

Check Wiring and Connections:

  • Inspect the wiring harness connected to the alternator and power supply for any signs of damage, wear, or loose connections.
  • Repair or replace any damaged wiring as necessary.

Update Control Software:

  • Ensure the control unit software is up-to-date with the latest fixes and improvements.

Consult Technical Support:

  • If the issue persists, contact technical support for further diagnostics and potential component replacement.

Monitor System Performance:

  • After addressing the issue, monitor the electrical system to ensure normal operation and that the fault does not reappear.


Regular inspection and maintenance of the battery, alternator, and associated wiring can prevent this fault. Consider environmental conditions such as extreme temperatures or exposure to moisture that can impact electrical component performance.

Control Units: John Deere

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