CAB 000091.03 – High Voltage Detection in Foot Throttle Sensor Circuit

CAB 000091.03 (CAB 91.03)

Code: 000091.03

Shortcode: 91.03


Error code CAB 000091.03 is activated when the CAB control unit identifies an abnormally high voltage in the foot throttle sensor input. This condition can disrupt the normal functioning of the throttle control, leading to potential issues with engine management and vehicle performance.


To prevent over-speeding and associated hazards, the control unit restricts the throttle capability, allowing a maximum operation of only half throttle. This safety measure helps control the vehicle’s speed and prevents engine damage due to excessive throttle input.


  • Inspect Sensor and Wiring: Check the foot throttle sensor and associated wiring for any signs of damage, corrosion, or loose connections that might cause high voltage readings.
  • Verify Power Supply Voltages: Ensure that the power supply to the sensor is within specified limits. Overvoltage to the sensor can result from a malfunctioning voltage regulator or electrical system issues.
  • Calibrate Foot Throttle Sensor: Recalibrate the foot throttle sensor to ensure that it correctly interprets input voltages. Follow the manufacturer’s guidelines for calibration procedures.
  • Replace Faulty Components: If persistent high voltage readings are detected, consider replacing the foot throttle sensor or repairing any faulty electrical components identified during the diagnostic process.
  • Test and Monitor System Performance: After adjustments, thoroughly test the system under various operational conditions to confirm that the throttle response is stable and appropriate. Regular monitoring after repair can help detect any recurring or new issues promptly.


Regular maintenance and proactive checks of the electrical system are crucial to avoiding such faults. Early detection and resolution of high voltage issues can significantly enhance the reliability and safety of the machinery, reducing downtime and repair costs.

Control Units: John Deere

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