Fendt A.1.2A – Electrical Valves Control Module: Spool valve fault, valve 2 — Main piston deflected too far

As a safety measure, the system forces the valve to move into the neutral position, disabling the hydraulic function for that specific circuit.

• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 715 Vario
• 716 Vario
• 717 Vario
• 718 Vario
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• Farmer 400 series
• Favorit 700 and 900 series
• 200 Vario series
• 300 Vario series
• 400 Vario series
• 500 Vario series
• 700 Vario series
• 800 Vario series
• 900 Vario series

1. 1

   Check for oil contamination in the hydraulic filters and fluid, which is a primary cause of spool valves sticking or deflecting too far.

2. 2

   Inspect the manual actuation mechanism on the valve block to ensure there is no play and the slider returns to the center position by itself without binding.

3. 3

   Check the CAN Bus and wiring harness for Valve 2 (often color-coded blue) for chafing or loose connections.

4. 4

   Verify that the hydraulic system is operating at the correct control pressure (above 22 bar) and that the hydraulic oil is up to operating temperature.

1. 1

   Isolate the System

   Turn off the engine, relieve all hydraulic pressure from the system, and clean the area around the valve stack to prevent dirt from entering the hydraulic lines.

2. 2

   Remove the Faulty Valve

   Disconnect the electrical CAN bus connector for Valve 2 (Y016). Cap all open hydraulic lines and T-connectors immediately. Unbolt the valve from the hydraulic block.

3. 3

   Inspect and Rebuild (Optional)

   If the issue is merely a worn seal or minor binding, the valve can sometimes be disassembled, cleaned, and rebuilt using an OEM O-ring/seal kit. However, if the internal bore or the metal spool is deeply scored, the valve cannot be saved and must be replaced.

4. 4

   Install the New Valve

   Mount the replacement spool valve to the block, torque the mounting bolts to factory specifications, and reconnect the hydraulic lines and electrical harness.

5. 5

   EOL Programming / Calibration

   Using a diagnostic tool (like TEXA or FENDIAS), clear the stored A.1.2A error code. Then, run the calibration/parameterization procedure to rewrite the ID code of the new component so the ECU recognizes it.