Case IH 6011 – Tractor Control Unit (TCU): 12VS2 voltage supply is low

The 12-volt power supply circuit (specifically circuit 12VS2) responsible for the Mechanical Front Drive (MFD) and Differential Lock systems is reading below the minimum required voltage threshold. This is most commonly caused by a blown power supply fuse or a faulty control module.

• Magnum
• Steiger T4B
• Magnum 215
• Magnum 235
• Magnum 245
• Magnum 255
• Magnum 275
• Magnum 285
• Magnum 305
• Magnum 340
• STX Steiger Series

1. 1

   Check for other low voltage supply-related error codes, which may indicate a broader electrical supply issue

2. 2

   Clear the 6011 error code using an approved diagnostic tool and retest under normal operating conditions to rule out a transient voltage drop

3. 3

   Inspect TCU power supply fuses (specifically fuses 4, 47, 48, 49, 50, 51, 54, 55, and 56) in the main electrical fuse panel

1. 1

   Locate the Fuse Box

   Access the tractor's main electrical fuse panel.

2. 2

   Test Fuses

   Pull and test the specified TCU power supply fuses (4, 47, 48, 49, 50, 51, 54, 55, and 56) for continuity using a multimeter.

3. 3

   Replace Blown Fuse

   If a blown fuse is located, replace it with a new fuse of the exact same amperage rating.

4. 4

   Clear Codes

   Erase the fault code using your diagnostic equipment and return the unit to field operation to verify the repair.

5. 5

   TCU Evaluation

   If all TCU power supply fuses are good and the wiring harness shows no visible damage, the failure mode is likely an internal fault within the Tractor Control Unit (TCU). Contact ASIST (Case IH dealer technical support) for advanced module verification before replacing the TCU.