John Deere 925.03 – SCO / SCC: Stepper Motor for E-SCV XII, Supply Voltage Too High

Code 000925.03 indicates that the supply voltage (BAT) for the stepper motor of Electronic Selective Control Valve 12 (E-SCV XII) has risen above 16 volts. This excessive voltage condition forces the control software to limit or completely disable the function of that specific selective control valve to prevent electrical damage.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6090M
• 6100M
• 6110M
• 6120M
• 6130M
• 6140M
• 6155M
• 6230R
• 6250R
• 7R Series

1. 1

   Monitor Voltage: Use a multimeter or John Deere Service ADVISOR to continuously monitor the voltage at the E-SCV XII stepper motor input. Confirm if it is spiking above the 16-volt threshold.

2. 2

   Verify Power Supply / Alternator: Ensure that the tractor's overall power supply and alternator output are stable. A failing alternator voltage regulator can cause system-wide voltage spikes.

3. 3

   Inspect Wiring: Check the wiring harness routing to the E-SCV XII stepper motor for any signs of chafing, melting, or a short-to-power condition.

4. 4

   Check Electrical Connections: Inspect the connector at the stepper motor and the SCC/SCO module for corrosion, looseness, or bent pins.

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the battery to ensure safety while working on the electrical system.

2. 2

   Clean and Secure Connections

   If corrosion or loose pins were found during diagnostics, clean the contacts with electrical contact cleaner and securely reseat the harness connectors.

3. 3

   Repair Wiring

   If a short-to-power is located in the harness, splice and heat-shrink the damaged wires, or replace the affected harness section.

4. 4

   Replace Power Supply Components

   If the alternator is overcharging the system (outputting >16V), replace the alternator or voltage regulator.

5. 5

   Replace the Stepper Motor

   If the wiring and system voltage are perfectly stable but the E-SCV XII stepper motor has internally shorted and is causing the fault, unbolt the faulty stepper motor from the valve block and install a replacement.

6. 6

   Recalibrate

   After replacing the motor or repairing the wiring, reconnect the battery, clear the fault codes, and use the diagnostic tool to recalibrate the E-SCV module.