New Holland MFD 6011 – MFD/Diff Lock Controller: 12VS2 voltage supply is low. (possible blown fuse*)

This code indicates that the voltage on the 12VS2 power supply circuit has dropped below the minimum acceptable threshold. The system flags this as a critical power loss to the controller, most commonly caused by a blown fuse or a short/open circuit in the wiring harness supplying that specific rail.

• New Holland T8.xxx Series (e.g., T8.275, T8.300, T8.390)
• New Holland T7 Series (e.g., T7.220, T7.235, T7.250, T7.260, T7.270)
• New Holland T6 Series

1. 1

   Check the fuse responsible for the 12VS2 circuit (often F36 on T-series and Magnum models) to see if it has blown.

2. 2

   If the fuse is blown, inspect the wiring harness running from the fuse panel to the MFD/Diff Lock controller (specifically checking the wire leading to pin CN3-B03) for chafed wires rubbing against the chassis that could cause a short to ground.

3. 3

   If the fuse is intact, use a multimeter to measure the voltage at the 12VS2 pin on the controller harness with the key ON. It should read battery voltage (approximately 12V).

4. 4

   Verify overall system voltage by ensuring the tractor's batteries are fully charged and the alternator is outputting correct voltage.

1. 1

   Power Down

   Turn off the tractor, apply the parking brake, and remove the key from the ignition.

2. 2

   Access the Fuse Box

   Open the fuse panel (usually located in the cab console or under the right-hand access panel, depending on the model).

3. 3

   Replace the Fuse (If Blown)

   Remove the blown fuse for the 12VS2 circuit. After repairing any chafed wiring found during the diagnostic phase, install a new mini fuse of the exact same amperage (refer to the fuse panel decal, typically 25A or 30A).

4. 4

   Repair Wiring (If Applicable)

   If the fuse was good but voltage at the controller was low, trace the 12VS2 wire back to the fuse block. Cut out any corroded or broken sections of the wire and splice in a new section using weather-resistant heat-shrink butt connectors.

5. 5

   Test the System

   Turn the ignition key to the ON position. Clear the inactive fault codes using the tractor's diagnostic display.

6. 6

   Operational Check

   Start the tractor and engage/disengage the MFD and Differential Lock switches. Verify that the MFD 6011 code does not return and that the front drive engages properly.