Massey Ferguson A.21.1F – Dash: External Hydraulic Valve 2 Issue

This fault code indicates an issue within the second external hydraulic remote valve circuit. It is typically caused by a connection problem on the hydraulic valve, an out-of-range spool position sensor value, or a loss of communication between the Dash and the Mid Mount Valve Module.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S

1. 1

   Retrieve active codes using a diagnostic tool to confirm if 0A.21.1F is active and check for related spool position sensor codes (e.g., M17, M18, M19, M21).

2. 2

   Inspect the wiring harness, pins, and connectors leading to External Hydraulic Valve 2 for corrosion, moisture, or damage.

3. 3

   Verify the spool position sensor value via the diagnostic interface to see if it is reading out of bounds.

4. 4

   Verify communication between the Dash and the Mid Mount Valve Module.

1. 1

   Relieve hydraulic pressure

   Ensure the tractor is off, implements are lowered, and hydraulic pressure is fully relieved from the system before servicing any components.

2. 2

   Repair wiring and connections

   If a connection problem is found, clean the contacts on the External Hydraulic Valve 2 harness. Replace the connector pigtail if the pins are damaged.

3. 3

   Replace sensor or valve

   If the spool position sensor is integrated into the valve and reading incorrect values, replace the electronic spool valve head or the entire valve section.

4. 4

   Reassemble and calibrate

   Install the new valve or sensor and reconnect the wiring harness.

5. 5

   Clear codes and test

   Use the diagnostic tool to clear the DTCs and cycle the hydraulic valve to ensure the code does not return.