OIC 003033.03 – Sensor Unit for Left Brake Pedal, Voltage Too High

OIC 003033.03 (OIC 3033.03)

Code: 003033.03

Shortcode: 3033.03


This error code indicates that the voltage at the signal input of the left brake pedal potentiometer exceeds 4.5 volts. This high voltage suggests a short circuit or a problem with the ground connection in the potentiometer circuit.


The control software may function in a limited capacity or not at all, affecting the left brake pedal sensor unit.


Inspect Signal and Ground Connections:

  • Check the wiring for the signal lead and ground connection of the left brake pedal potentiometer for any signs of damage, loose connections, or corrosion. Repair or replace as necessary.

Test Potentiometer Output:

  • Use a multimeter to measure the voltage at the signal input. If it consistently reads above 4.5 volts, the potentiometer may be faulty and require replacement.

Verify Ground Integrity:

  • Ensure the ground connection is secure and free of corrosion, as a poor ground can cause high voltage readings.

Update Control Software:

  • Ensure that the control software is updated to the latest version. Firmware updates might include improvements in handling potentiometer signals.

Consult Manufacturer Support:

  • If the issue persists, consult technical support or the manufacturer for further diagnostics and potential replacement parts.

Monitor System Performance:

  • After taking corrective actions, monitor the system to ensure the error does not recur and that the brake pedal functions correctly.


Regular maintenance of the brake pedal potentiometer and its connections can prevent voltage-related issues and ensure safe vehicle operation.

Control Units: John Deere

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