ACU 000974.04 (ACU 974.04 ) – Low Voltage Detected in Hand Throttle Sensor Circuit

ACU 000974.04 (ACU 974.04)

Code: 000974.04

Shortcode: 974.04


The error code ACU 974.04 is triggered when the voltage in the hand throttle sensor circuit is lower than expected. This low voltage condition could result from a variety of issues, such as poor electrical connections, degraded wiring, or a failing sensor.


Due to this voltage anomaly, the control unit has degraded function to stabilize operation and prevent unsafe equipment behavior.


  • Inspect the hand throttle sensor and its connections for any signs of damage, wear, or loose connections that could result in reduced voltage.
  • Measure the voltage levels using a multimeter to verify that they are below normal operational ranges and identify possible points of failure.
  • Ensure that all wiring to and from the hand throttle sensor is intact, properly insulated, and free from corrosion.
  • Replace the hand throttle sensor if it fails to meet the specified voltage requirements upon testing.
  • If the issue persists after these corrective steps, consider consulting with a John Deere certified technician for a more in-depth diagnosis and potential system overhaul.


Continuous operation with low voltage conditions in critical sensor circuits can compromise precision and safety. It’s crucial to address such issues promptly to ensure optimal machinery performance and operator safety.