Fendt 04.1.07 – Transmission Control System / Basic Control Unit ECU (A050): B008 - High pressure sensor 1, transmission drive pressure.

The system has detected a signal fault or a faulty sensor at the B008 high-pressure sensor. This can be caused by an internal sensor failure, a wiring issue, or a loss of the 8.5V or 12V power supply to the sensor. As a safety measure, the Tractor Management System (TMS) is switched off, operating range switching from 1 to 2 is disabled, and the transmission protection function becomes active (limiting engine power to 70%).

• 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
• 300 Vario series
• 400 Vario series
• 700 Vario series
• 800 Vario series
• 900 Vario series
• Farmer 310
• Farmer 311
• Farmer 312

1. 1

   Inspect the B008 sensor and its electrical connector (separation point X157) for corrosion, damage, or loose pins

2. 2

   Check the A013 fuse block (commonly Fuse 3, Fuse 10, or Fuse 32 depending on the series) for a blown fuse causing an 8.5V or 12V supply fault

3. 3

   Use the Variotronic terminal or diagnostic tool to check for plausibility errors between the B008 sensor and the B039 sensor

4. 4

   Ensure the transmission fluid is at the correct level and the filters are clean to rule out pressure irregularities

1. 1

   Locate the Sensor

   The B008 high-pressure sensor is typically located on the right side of the transmission, mounted on the valve block.

2. 2

   Gain Access

   On many models (such as the 300 series), you will need to remove the right rear wheel and the protective metal panels to access the transmission valve block.

3. 3

   Remove the Faulty Sensor

   Disconnect the electrical harness from the sensor. Unthread the sensor from the hydraulic manifold.

4. 4

   Install the New Sensor

   Thread the new sensor into the port. Ensure that the sealing O-ring is replaced and seated correctly to prevent hydraulic leaks.

5. 5

   Reassemble

   Reconnect the electrical harness, reinstall the metal panels, and remount the rear wheel.

6. 6

   Clear Codes and Calibrate

   Clear the fault code 04.1.07 from the system. Run the transmission calibration procedure to ensure the new sensor is reading accurately.