EPC 000974.04 – B96 Hand Throttle Potentiometer, Voltage Too Low

EPC 000974.04 (EPC 974.04)

Code: 000974.04

Shortcode: 974.04


This error code, EPC 000974.04, is generated when the control unit measures a voltage below 0.3 volts at the signal input of the hand throttle potentiometer (B96, lead 6018). This indicates a short to ground or a problem with the potentiometer supply voltage.


When this error is detected, the control system may not accurately interpret the hand throttle position, leading to potential issues with throttle control and engine performance.


Inspect Wiring and Connections:

  • Check the wiring and connections to the hand throttle potentiometer (B96) for any signs of damage, loose connections, or corrosion. Repair or replace as necessary.

Test Potentiometer:

  • Use diagnostic tools to test the hand throttle potentiometer (B96) for functionality. Replace the potentiometer if it is found to be defective.

Check for Short to Ground:

  • Inspect the circuit for any signs of shorting to ground. Repair any detected faults.

Verify Supply Voltage:

  • Ensure that the supply voltage to the potentiometer is within the correct range. Check for any issues with the power source or control unit that could affect voltage levels.

Reset and Test System:

  • After addressing the issues, reset the system and test the hand throttle potentiometer to ensure it is operating correctly and that the error code does not reoccur.


Regular inspection and maintenance of the potentiometer and its associated wiring are crucial for ensuring accurate throttle control and preventing voltage issues.

Control Units: John Deere

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