Fendt 04.1.45 – Transmission Control System: B015 - Sensor, bevel pinion (=travel speed)

Triggered when the system detects that the B015 Hall sensor is faulty or is sending an erratic/missing speed signal. Frequently caused by a faulty 8.5 V power supply to the sensor.

• 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 / Farmer 400 (COM III)
• Fendt 700 Vario / Favorit 700 (COM III)
• Fendt 800 Vario (COM III)
• Fendt 900 Vario / Favorit 900 (COM III)

1. 1

   Check Fuse 08 on the A013 fuse board for a loss of the 8.5V power supply (most common electrical cause).

2. 2

   Disconnect the B015 sensor and use a multimeter to verify that the 8.5 V supply is reaching the connector when the ignition is ON.

3. 3

   Inspect the wiring harness between the B015 sensor and the Transmission Control Unit for breaks, chafing, or corrosion.

4. 4

   Verify if the tractor can still move in emergency mode, which confirms the mechanical driveline is intact and isolates the issue to the electronic speed monitoring circuit.

1. 1

   Locate the Sensor

   Locate the B015 bevel pinion speed sensor on the Vario transmission housing.

2. 2

   Disconnect Electronics

   Carefully unplug the electrical connector from the B015 sensor.

3. 3

   Remove the Sensor

   Remove the retaining bolt(s) securing the sensor to the transmission housing and pull the sensor straight out.

4. 4

   Install the New Sensor

   Lubricate the O-ring on the new sensor with clean transmission oil. Insert it into the housing and tighten the retaining bolt to OEM torque specifications.

5. 5

   Reconnect and Clear Codes

   Reconnect the wiring harness. Turn the ignition ON and use the tractor's terminal or a diagnostic tool (like TEXA or FENDIAS) to clear the stored 04.1.45 fault code.

6. 6

   Test Drive

   Operate the tractor to ensure the travel speed registers correctly on the dash and that the transmission shifts out of emergency mode.