New Holland 15012 – Steering Controller: Split Valve Spool Stuck Open

The fault code 15012 indicates a malfunction within the hydraulic steering circuit, specifically that the spool of the composite 'Split Valve' is stuck in the open position. This valve is a critical component of the tractor's Fast Steer system. When the spool is stuck open, it disrupts normal steering operation and may cause improper operation of the system it controls.

• TM115
• TM120
• TM125
• TM130
• TM135
• TM140
• TM150
• TM155
• TM165
• TM175
• TM190
• T6010
• T6020
• T6030
• T6040
• T6050
• T6060
• T6070
• T7030
• T7040
• T7050
• T7060
• TS100A
• TS110A
• TS115A
• TS125A
• TS130A
• TS135A
• T7
• Magnum
• MXM

1. 1

   Check the hydraulic fluid level and quality, as low or contaminated fluid can affect hydraulic components.

2. 2

   Inspect for any hydraulic leaks, especially around the steering valve and its connections.

3. 3

   Check for related electrical fault codes (such as 15006 or 15007) which indicate an electrical issue with the sensor monitoring the spool's position.

4. 4

   Inspect the wiring harness and connectors leading to the steering control valve for signs of damage, corrosion, or loose connections.

5. 5

   Check if the system requires calibration (indicated by fault code 15024).

6. 6

   Perform a hydraulic pressure test on the steering system to ensure the pump is providing adequate pressure.

1. 1

   Safety preparation

   Park the tractor on a level surface, engage the parking brake, and turn off the engine.

2. 2

   Access and clean steering valve

   Locate the steering valve under the cab or near the front axle. Thoroughly clean the area around the steering valve to prevent contamination of the hydraulic system.

3. 3

   Remove steering valve

   Carefully disconnect the hydraulic lines connected to the steering valve (be prepared for residual fluid to leak). Unbolt and remove the steering valve assembly from the tractor.

4. 4

   Replace steering valve assembly

   Replace the entire steering valve assembly. The split valve spool is generally an integral component within the main steering valve and is rarely serviceable separately.

5. 5

   Install and bleed system

   Install the new steering valve, reconnect the hydraulic lines, and torque all fittings to the manufacturer's specifications. Bleed any air from the hydraulic steering system according to the manufacturer's procedure.

6. 6

   Calibrate and clear codes

   Perform the steering system calibration procedure (typically accessed through instrument cluster menu H1). Clear the 15012 fault code using the instrument cluster menu (often menu HC) or the Electronic Service Tool, then start the tractor and test steering operation.