New Holland TRANS 2055 – TRANS: No signal from wheel speed sensor

The transmission controller is not receiving the expected rotational speed data from the wheel/axle speed sensor, which is required to calculate ground speed, manage transmission shifting, and operate traction control systems.

• New Holland T6
• New Holland T7
• New Holland T8
• New Holland TG
• New Holland TM
• New Holland TS
• New Holland TSA
• New Holland T6000
• New Holland T7000

1. 1

   Inspect the wiring harness and electrical connectors running from the wheel speed sensor to the Transmission ECU for corrosion, physical damage, or loose pins.

2. 2

   Remove the sensor and inspect the tip for cracks or physical damage, which indicates contact with internal moving parts.

3. 3

   Use a multimeter to test the sensor's resistance and verify it is outputting a signal when the wheel or shaft rotates. Check for a short to ground or an open circuit.

4. 4

   Ensure the sensor is positioned correctly relative to the internal tone ring, as an improper gap will result in a weak or missing signal.

1. 1

   Disconnect Power

   Disconnect the tractor's battery before beginning electrical work.

2. 2

   Locate the Sensor

   Locate the wheel speed sensor. Depending on the specific tractor model, it is typically mounted on the right side of the rear axle housing (in front of the axle) or directly on the transmission casing. Note: On some models, you may need to remove a hydraulic filter or wheel to gain clear access.

3. 3

   Remove the Old Sensor

   Disconnect the electrical connector. Unbolt and carefully pull the old sensor out of the housing (it may be seated very tightly).

4. 4

   Install the New Sensor

   Insert the new sensor into the housing, ensuring it is seated to the correct depth. Fasten the mounting bolt.

5. 5

   Reconnect

   Reconnect the electrical harness until it clicks securely, then reconnect the battery.

6. 6

   Test Drive

   Start the tractor and perform a test drive. Verify that the instrument cluster speedometer reads correctly without erratic jumping. Ensure the transmission shifts smoothly through all gears (a failed speed sensor will often force the transmission into a protective mode, limiting the tractor from shifting into higher gears, such as locking out gears 14-16).