Fendt 08.1.37 – Rear EPC: S027, S029 - External button raise left and right, rear power lift

Button raise line interruption or Signal line fault. The tractor's computer has detected a break in the wiring circuit, a loss of signal, or a mechanical failure in the external pushbuttons used to raise the rear three-point hitch from outside the cab.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• Fendt 300 Vario series
• Fendt 400 Vario series
• Fendt 500 Vario series
• Fendt 700 Vario series
• Fendt 800 Vario series
• Fendt 900 Vario series

1. 1

   Inspect the external raise buttons on the rear fenders (S027 on the right fender, S029 on the left fender) for physical damage, sticking mechanisms, or heavy moisture/dirt ingress.

2. 2

   Trace the wiring harness from the S027 and S029 switches back to the Rear EPC control module. Look for pinched wires, breaks, or rubbed-through insulation causing a short to ground or an open circuit.

3. 3

   Disconnect the switches and check the electrical contacts for corrosion or bent pins.

4. 4

   Attempt to clear the fault code from the tractor's terminal memory. If the code immediately returns upon startup, it is a hard fault (likely a dead switch or severed wire) rather than an intermittent glitch.

1. 1

   Park the tractor on a level surface, lower any attached implements to the ground, turn off the engine, and engage the parking brake.

   Ensure the machine is safe to work on.

2. 2

   Disconnect the negative battery cable to prevent electrical shorts during the repair.

   Safety precaution before working on electrical components.

3. 3

   Locate the faulty external lift switch on the rear fender (left or right, depending on which side failed).

   Identify the specific switch to be replaced.

4. 4

   Reach under the fender housing and carefully disconnect the wiring harness plug from the back of the switch.

   Disconnect the electrical connection.

5. 5

   Remove the retaining clips or screws holding the switch in the fender panel and push the old switch out.

   Extract the faulty switch from the housing.

6. 6

   Clean the wiring harness connector thoroughly. Applying a small amount of dielectric grease to the new switch contacts is recommended to prevent future moisture corrosion.

   Prepare the connection for the new switch.

7. 7

   Snap the new OEM switch into the fender housing and reconnect the wiring harness.

   Install the replacement switch.

8. 8

   Reconnect the battery, turn on the tractor's ignition, and navigate to the terminal to clear the stored 08.1.37 fault code.

   Restore power and clear the fault memory.

9. 9

   Test the external raise button to ensure the rear power lift actuates smoothly.

   Verify the repair was successful.