PTA 001387.03 – Lube Oil Pressure Sensor, Voltage Too High

PTA 001387.03 (PTA 1387.03)

Code: 001387.03

Shortcode: 1387.03


This diagnostic trouble code is generated when the PTA control software detects that the voltage at the lube oil pressure sensor is too high. This indicates that the sensor circuit is open or shorted to a positive lead in the sensor circuit.


Limited or no function of the transmission until the error is corrected, indicating a significant issue with the oil pressure sensor circuit.


Inspect Sensor Circuit:

  • Check the sensor circuit for any open connections or short circuits to positive leads.
  • Repair any identified issues in the circuit.

Test Oil Pressure Sensor:

  • Verify the sensor’s voltage output using a multimeter.
  • Replace the sensor if it is producing abnormally high voltage readings.

Examine Wiring and Connectors:

  • Inspect all wiring and connectors associated with the oil pressure sensor for signs of damage or corrosion.
  • Repair or replace as necessary to ensure proper electrical connections.

Ensure Proper Grounding:

  • Verify that the sensor and its circuitry are properly grounded.
  • Correct any grounding issues that may be causing voltage irregularities.


High voltage readings from the lube oil pressure sensor can lead to severe operational problems. Regular inspection and maintenance of the sensor and its circuitry are essential to prevent these issues.

Control Units: John Deere

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