Case IH 15265 – Steering Valve Controller (SVC): Steering valve controller failure - Overvoltage supervisor self-test failed

This code indicates an internal hardware or software failure within the steering control system. Specifically, the internal overvoltage supervisor (a safety monitoring circuit) failed its self-test during startup or operation, meaning the controller can no longer guarantee safe operation of the steering valve.

• Steiger T4B
• Case IH AFS Connect Magnum Tractors (Models 180, 200, 220, 240, 250, 280, 310, 340, 380)
• Case IH Farmall Tractors (Models 40, 45, 50)

1. 1

   Check the machine's charging system and verify that system voltage does not exceed standard operating limits (typically ~14.5V for a 12V system).

2. 2

   Inspect the wiring harness leading to the Steering Valve Controller for any chafed wires that might be shorting to a high-voltage power source.

3. 3

   Ensure the ground connections for the SVC are clean and tight to prevent voltage spikes or erratic self-test results.

4. 4

   Check the current software version on the SVC, as software corruption can sometimes trigger false self-test failures.

1. 1

   Disconnect Power

   Turn off the machine and disconnect the battery to prevent electrical spikes.

2. 2

   Locate the SVC

   Locate the Steering Valve Controller (usually mounted directly to or near the hydraulic steering control valve block).

3. 3

   Remove the Controller

   Disconnect the electrical harness connectors from the SVC. Unbolt the controller from its mounting bracket or the valve body.

4. 4

   Install the New Controller

   Mount the replacement Steering Valve Controller and reconnect the wiring harnesses securely.

5. 5

   Flash/Program the Module

   Use the Case IH Electronic Service Tool (EST) to flash the controller with the correct software dataset for your specific machine.

6. 6

   Calibration

   Perform the steering valve calibration and straight-line tracking calibration via the EST or the AFS Pro display to synchronize the new main controller with the safety/redundant controllers.