Massey Ferguson Error Code T 2055 — What It Means and How to Fix It

Applies to: MF 5700 SL Series (Dyna-6), MF 6700 S Series (Dyna-6, Dyna-VT), MF 7700 S Series (Dyna-6, Dyna-VT), MF 8700 S Series (Dyna-VT)

STOP — Tractor may not move. Transmission has lost wheel speed data.

Try cycling the key first. If the tractor still won't move, check the speed sensor connector on the transmission housing.

MF T 2055Massey FergusonManually verified

Transmission Wheel Speed Sensor Fault

The transmission controller is not receiving a signal from the wheel speed sensor. The Dyna-VT or Dyna-6 transmission cannot function correctly without speed data and will enter protective mode, refusing to move.

Repair difficulty

DIY — Basic tools

Repair time

20 min

Dealer cost

$200-500

What to check first

  1. 1

    Cycle the key — off for 60 seconds, restart. Momentary signal loss often clears on restart.

  2. 2

    Locate the wheel speed sensor on the transmission output section and check the connector — disconnect, clean, inspect, reconnect.

  3. 3

    Check sensor wiring for damage — the transmission area is hot and can degrade wiring over time.

Likely causes

  1. 1

    Loose or corroded connector— Most likely

    DIY

    Most common cause. Clean and reconnect firmly.

  2. 2

    Failed speed sensor— Possible

    DIY

    Test resistance: typically 800-1,200 ohms. 0 or infinite = failed.

  3. 3

    Wiring damage— Possible

    DIY

    Oil, heat, and vibration degrade wiring near the transmission.

  4. 4

    Sensor air gap too large— Less common

    DIY

    Sensor may have backed out of its mounting. Check gap against service manual spec.

Parts needed

Tools needed

  • Socket set
  • Multimeter
  • Contact cleaner
  • Dielectric grease

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Pro tip

This sensor is cheap and easy to replace. Carry a spare during busy seasons. A tractor that won't move during harvest is the definition of expensive downtime.

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