Massey Ferguson 04.01.2A – TRANS: Transmission Output Speed Sensor Issue

The electronic control system is receiving an erratic, missing, or out-of-range signal from the sensor responsible for reading the rotational speed of the transmission output shaft.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 5400 series
• 6400 series
• 6600 series
• 6700 series
• 7600 series

1. 1

   Perform diagnostic tests on the sensors using the official Massey Ferguson Wintest software to identify if the issue is the sensor itself or a wiring/harness fault.

2. 2

   Visually inspect the wiring harness and the electrical connector at the sensor for corrosion, moisture, or physical damage.

1. 1

   Disconnect Power

   Always disconnect the tractor's battery before starting work to prevent electrical damage or short circuits.

2. 2

   Locate the Sensor

   The transmission output speed sensor is typically accessible from underneath the tractor, mounted on the transmission housing near the output shaft.

3. 3

   Clean the Area

   Thoroughly clean the sensor mounting area and the electrical connector to prevent dirt and debris from entering the transmission housing when the old sensor is removed.

4. 4

   Remove and Replace

   Unplug the electrical connector, unthread/remove the old sensor, and install the new direct-replacement sensor.

5. 5

   Reassemble and Clear Codes

   Reconnect the electrical harness, reconnect the battery, and use a diagnostic tool to clear the 04.01.2A fault code from the TRANS module. Test drive to ensure smooth shifting and proper speedometer function.