Fendt 4.1.83 – Transmission Control Unit: B014, B015 - Accumulator shaft / bevel pinion speed Hall sensor — Plausibility error

This code indicates a plausibility error (specifically regarding direction or speed matching) between the hydrostatic unit speed sensor (B014 - Accumulator/collecting shaft) and the bevel pinion speed sensor (B015). The control unit detects that the speed curves or rotational directions reported by these two Hall-effect sensors do not logically match.

• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 715 Vario
• 716 Vario
• 717 Vario
• 718 Vario
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• 300 Vario series
• 400 Vario series
• 700 Vario series
• 800 Vario series
• 900 Vario series

1. 1

   Inspect the wiring harness and connectors for both the B014 (accumulator/collecting shaft) and B015 (bevel pinion) sensors for chafing, corrosion, or loose pins.

2. 2

   Verify if the fault occurs intermittently (e.g., after hours of work), which highly indicates a wiring short/break or a sensor failing under heat.

3. 3

   Check the B016 travel speed range detection sensor (potentiometer range change), as a fault here can sometimes trigger this plausibility error.

4. 4

   Ensure the transmission sensors are properly calibrated, as mechanical and electrical tolerances can cause plausibility mismatches.

1. 1

   Power Down

   Turn off the ignition and apply the handbrake.

2. 2

   Inspect Wiring

   Physically trace the wiring from the transmission control unit to the B014 and B015 sensors on the hydrostatic unit. Repair any damaged wires or clean corroded connector terminals.

3. 3

   Test Sensors

   Use a multimeter or diagnostic tool (FENDIAS) to monitor the live speed outputs of B014 and B015 while driving. Identify which sensor is dropping the signal or providing erratic readings.

4. 4

   Replace Faulty Sensor

   If a sensor is deemed faulty, remove the retaining bolt, pull the old Hall sensor from the transmission housing, and install the new OEM sensor.

5. 5

   Clear Codes and Calibrate

   Reconnect the battery/ignition, clear the fault codes via the terminal or FENDIAS tool, and perform a test drive to ensure the speeds match and the emergency mode does not re-engage.