Fendt 08.1.41 – Rear EPC (Electrohydraulic Power Control) control module: S030 - Switch (external), lower rear power lift, left

This code indicates a signal line fault or a faulty button mechanism on the external switch used to lower the rear linkage from the left rear fender. The external lower button is barred and locked, rendering it inoperable. However, the rear power lift can still be operated internally from the cab. The external button will remain locked until the next trouble-free cold start (ignition cycle).

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• Fendt 200 V/F/P Vario series
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III, SCR)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III, SCR)

1. 1

   Visual Inspection: Inspect the S030 switch on the left rear fender for physical damage, water ingress, or sticking buttons.

2. 2

   Wiring & Connector Check: Inspect the wiring harness and connector at the switch for corrosion, broken wires, or a short circuit. The fault is often a signal line fault.

3. 3

   Continuity Test: Use a multimeter to test the S030 switch for proper open/closed continuity when pressed.

4. 4

   Module Voltage Check: Verify the voltage at the Rear EPC control module. Related faults can trigger if the module receives a stable voltage of < 1 volt or > 18 volts.

5. 5

   Circuit Diagram Reference: Refer to the Electrohydraulic power lift control circuit diagram (often Sheet 7 or Sheet 25 in Fendt manuals) to trace the signal line back to the EPC module.

1. 1

   Power Down

   Turn off the tractor ignition and remove the key.

2. 2

   Access the Switch

   Locate the S030 external lower switch on the left rear fender.

3. 3

   Disconnect

   Carefully unplug the electrical connector from the back of the switch.

4. 4

   Remove and Replace

   Unclip or unscrew the faulty switch from the fender housing and install the replacement switch.

5. 5

   Reconnect

   Plug the electrical connector back in, ensuring the weather seal is intact to prevent future moisture ingress.

6. 6

   Clear the Fault (Cold Start)

   The system requires a trouble-free cold start to reset the locked control. Turn the ignition ON, wait a few seconds for the modules to initialize, and verify that the fault code has cleared.

7. 7

   Test Operation

   Test the external left lower button to ensure the rear power lift responds correctly.