PTQ 000127.01 – Transmission Oil Pressure Out of Range Low

PTQ 000127.01 (PTQ 127.01)

Code: 000127.01

Shortcode: 127.01


This diagnostic trouble code, PTQ 000127.01, is generated when the transmission oil pressure (system pressure) is detected to be too low while the engine speed is above 800 rpm. This condition can lead to insufficient lubrication and cooling of the transmission components, potentially causing damage if not addressed promptly.


When this error is detected, the control software shifts the transmission to neutral to prevent potential damage. The tractor can only be driven in “come-home” mode, which limits functionality to allow the operator to move the tractor to a safe location for further inspection and repair.


Check Transmission Oil Level:

  • Inspect the transmission oil level and ensure it is within the recommended range.
  • Add transmission oil if the level is low.

Inspect for Leaks:

  • Check for any signs of oil leaks around the transmission system.
  • Repair any identified leaks to maintain proper oil pressure.

Check Oil Filter:

  • Inspect the transmission oil filter for clogs or damage.
  • Replace the oil filter if it is found to be obstructed or damaged.

Verify Oil Pump Operation:

  • Ensure that the transmission oil pump is functioning correctly.
  • Replace the oil pump if it is found to be defective.

Monitor Oil Pressure:

  • Use a diagnostic tool to monitor the transmission oil pressure while the engine is running.
  • Confirm that the oil pressure remains within the specified range at all operating conditions.


  • Regular maintenance of the transmission system, including oil and filter changes, is crucial to prevent low oil pressure issues.
  • If the problem persists after taking the above steps, consult technical support or the manufacturer for further diagnosis and repair.

Control Units: John Deere

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