ACU 523953.03 – High Voltage in AutoPowr/IVT Speed Control Lever Sensor

ACU 523953.03 (ACU )

Code: 523953.03



This error code, ACU 523953.03, indicates that the voltage at the AutoPowr/IVT speed control lever sensor is excessively high. Such elevated voltage readings can be indicative of electrical overloads, improper wiring, or a malfunction within the sensor itself.


In response to the high voltage reading, the control unit has automatically defaulted the vehicle’s transmission to neutral to prevent any unintended actions that could arise from this anomaly.


  • Inspect the speed control lever sensor and associated wiring for any signs of damage, wear, or incorrect connections that could lead to high voltage levels.
  • Use a multimeter to check the voltage output at the sensor. Ensure that the voltage levels are within the specified range according to the manufacturer’s guidelines.
  • Check for potential sources of electrical interference or a faulty voltage regulator that may be causing the high voltage condition.
  • Reset or recalibrate the sensor to see if this corrects the voltage readings. Follow the recalibration procedures detailed in the service manual.
  • If the issue persists after these checks and adjustments, it may be necessary to replace the sensor or conduct a more thorough inspection of the vehicle’s electrical system.


High voltage at critical sensors like the speed control lever can lead to operational hazards. It is crucial to address this promptly to ensure the safety and proper functioning of the machinery. Regular maintenance and electrical system checks are recommended to prevent similar issues.