ACU 000974.03 (ACU 974.03 ) – High Voltage Reading in Hand Throttle Sensor Circuit

ACU 000974.03 (ACU 974.03)

Code: 000974.03

Shortcode: 974.03


This error code ACU 974.03 indicates that the voltage in the hand throttle sensor circuit is unusually high. Such a condition could be due to a fault within the sensor itself, incorrect wiring, or a problem in the electrical system supplying the sensor.


To safeguard the system and prevent potential damage or erratic machine behavior, the control unit has degraded certain functions, limiting the operational capabilities of the equipment.


  • Verify the hand throttle sensor’s connections and wiring for any signs of damage, corrosion, or improper connections that might cause high voltage outputs.
  • Use a multimeter to measure the actual voltage levels at the sensor to determine if they exceed the specified range for normal operation.
  • Replace the hand throttle sensor if it is found to be defective or recalibrate the sensor to correct the voltage readings.
  • Examine the voltage regulator and other related electrical components that could be influencing the sensor’s voltage.
  • If corrective actions do not resolve the issue, it is advisable to seek assistance from a qualified John Deere technician who can perform a comprehensive diagnostic and take corrective measures.


High voltage levels in control circuits can lead to significant operational disruptions and safety risks. Regular maintenance and prompt attention to electrical system anomalies are critical to maintaining the health and efficiency of the machinery.