Fendt 06.1.42 – Enhanced Control ECU (A002): Right external "Rear PTO ON / OFF" pushbutton (S020) pressed continuously for more than 30 seconds

The system logs this code when it detects that the S020 right external "Rear PTO ON / OFF" pushbutton has been pressed continuously for more than 30 seconds. This indicates either a mechanical fault (jammed/stuck button) or an electrical fault (short circuit), which disables PTO speed preselection and prevents normal rear PTO engagement.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• 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 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 Vario (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario (COM III, S4)
• Fendt Favorit 900 Series

1. 1

   Inspect the S020 button on the rear right fender to see if it is physically stuck in the depressed position due to dirt, debris, or physical damage.

2. 2

   Access the back of the switch and inspect the wiring harness and the AMP Superseal connector for chafed wires, moisture ingress, or exposed copper that could be causing a short circuit to ground.

3. 3

   Disconnect the switch and use a multimeter to test it for continuity. The switch should only show continuity when actively pressed; if it shows a closed circuit while resting, the internal contacts have failed.

1. 1

   Turn off tractor and disconnect battery

   Turn off the tractor and disconnect the battery to prevent electrical spikes during the repair.

2. 2

   Locate faulty switch

   Locate the faulty S020 external PTO switch on the rear right fender.

3. 3

   Disconnect electrical plug

   Reach behind the fender panel and disconnect the electrical plug (typically a 3-pin AMP Superseal connector) from the switch.

4. 4

   Remove faulty switch

   Remove the retaining nut/clips holding the switch in place and pull the faulty switch out of the 30mm mounting hole.

5. 5

   Insert new switch

   Insert the new replacement switch into the fender and secure it.

6. 6

   Reconnect electrical plug

   Reconnect the electrical plug, ensuring the weather seal is seated correctly to prevent future moisture ingress.

7. 7

   Reconnect battery

   Reconnect the battery.

8. 8

   Clear codes and test

   Turn the ignition on, clear any stored fault codes via the Varioterminal, and test the external button to ensure the PTO engages and disengages properly.