New Holland UCM 1907 – UCM (Utility Control Module) / VCM (Vehicle Control Module): Power Supply: Rail 12VF1 - Aux Retract Input Power OFF

This code indicates that the 12-volt power supply (Rail 12VF1) dedicated to the auxiliary retract input circuit is experiencing a low voltage condition, an open circuit, or has been completely disconnected/cut off.

• L213
• L216
• L218
• L220
• L221
• L223
• L225
• L228
• L230
• L234
• C227
• C232
• C234
• C238
• L316
• L318
• L320

1. 1

   Check the Fuses: Locate the fuse block and check the specific fuse for the UCM/VCM 12VF1 circuit.

2. 2

   Inspect the Wiring Harness: Check the wiring harness running from the UCM to the auxiliary retract solenoid and the auxiliary electrical on/off switch for chafed wires, pinched lines, or disconnected terminals.

3. 3

   Test the Solenoid/Switch: Test the 2nd Aux Retract Solenoid and the auxiliary control switches on the left-hand (LH) multifunction grip for internal shorts.

1. 1

   Power Down

   Turn off the machine and disconnect the battery ground before servicing the electrical system.

2. 2

   Fuse Replacement

   Access the main fuse panel. Locate fuse F-053 (or the specific 12VF1 fuse for your exact model year). If it is blown, replace it with a new 5A fuse.

3. 3

   Harness Repair

   If the fuse was blown, do not just replace it and run the machine. Trace the wiring from the UCM to the auxiliary retract solenoid. Repair any damaged sections of the wiring harness using proper weather-sealed connectors.

4. 4

   Component Replacement

   If the wiring is intact but the circuit is still shorting/open, use a multimeter to check the resistance of the auxiliary retract solenoid. If it is out of spec (shorted internally), remove and replace the solenoid.

5. 5

   Reassemble and Clear Codes

   Reconnect the battery, power on the machine, and use your diagnostic tool to clear the UCM 1907 code. Test the auxiliary hydraulic retract function to ensure the code does not return.