CAB 524169.08 – Left Brake Pedal Sensor Adjustment Fault

CAB 524169.08 (CAB )

Code: 524169.08



Error code CAB 524169.08 is initiated when the CAB control unit detects a significant discrepancy between the voltage outputs of the left and right brake pedal sensors. Specifically, the voltage from the left brake pedal sensor is low, while the voltage from the right brake pedal sensor is high. This indicates a potential calibration or adjustment issue with one or both sensors, affecting their ability to accurately measure and report brake pedal positions. This fault pertains to vehicles equipped with the AutoPowr™ / IVT™ transmission, which utilizes sensors on both brake pedals.


Due to the critical nature of this fault, the control unit commands the vehicle into a ‘PARK’ position to prevent any unintended or unsafe movements. This state is recoverable after the issue is properly addressed.


  • Calibrate Both Brake Pedal Sensors: Conduct a comprehensive calibration of both the left and right brake pedal sensors. Ensure they are accurately reflecting the actual brake pedal positions and pressures according to the manufacturer’s specifications.
  • Inspect Sensors and Wiring: Examine both sensors for signs of damage, wear, or misalignment. Check all associated wiring and connectors for damage, corrosion, or loose connections that could affect sensor outputs.
  • Test Voltage Outputs: Use a multimeter or diagnostic tool to test the voltage outputs from both sensors while engaging the brake pedals. Compare these readings to ensure they are within the expected range and adjust as needed.
  • Replace Faulty Sensors: If recalibration does not correct the discrepancies, or if any sensor is found to be defective, replace it to ensure consistent and accurate operation.
  • Reset and Recalibrate the Control System: After any necessary adjustments, recalibrations, or replacements, reset the vehicle’s control system to clear the fault code. Recalibrate the system to ensure it recognizes the corrected sensor inputs.
  • Verify Operational Safety: Perform a series of operational tests to confirm that both brake pedals are functioning correctly and that the vehicle responds appropriately under various braking scenarios. Ensure there are no further discrepancies in sensor outputs.


Regular monitoring and maintenance of brake system components are essential, especially in advanced transmission systems like the AutoPowr™ / IVT™. Calibration errors can lead to significant safety issues, so it’s crucial to address any sensor discrepancies promptly to maintain the vehicle’s safety and operational reliability.

Control Units: John Deere

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