PTH 000158.00 – Switch Battery Potential Data Valid but Above Normal Operation Range – Most Severe Level

PTH 000158.00 (PTH 158.00)

Code: 000158.00

Shortcode: 158.00


This fault code indicates that the switched power is above the normal operating range at the most severe level. This could be due to alternator issues, wiring problems, or a malfunction in 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 may shut down or enter a safe mode to prevent damage.


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.

Test Power Train Hydrostatic Control Unit (PTH):

  • Perform diagnostic tests on the control unit to identify any faults.
  • Verify all electrical connections to the control unit are secure and corrosion-free.

Check Wiring and Connections:

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

Update Control Software:

  • Ensure the control unit software is current with the latest updates and calibrations.

Consult Technical Support:

  • If the fault 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 alternator and associated wiring can prevent this fault. Environmental conditions such as extreme temperatures or exposure to moisture can also impact electrical component performance, so these factors should be considered during troubleshooting.

Control Units: John Deere

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