Massey Ferguson 04.01.08 – Transmission Control Module (TRANS): Transmission High/Low Range Position Sensor Issue

The controller is receiving an erratic, missing, or out-of-range electrical signal from the sensor responsible for detecting whether the tractor's gearbox is currently in the High or Low range.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 5410
• 5425
• 5445
• 5455
• 5460
• 5480
• 5609
• 5610
• 5613
• 5710 SL
• 5713 SL
• 6445
• 6465
• 6480
• 6490
• 6499
• 6614
• 6616
• 6713 S
• 6718 S
• 7614
• 7626
• MT455B
• MT755C

1. 1

   Read and save the complete list of error codes present on the tractor

2. 2

   Inspect the wiring harness leading to the transmission range sensor for chafing, breaks, or heat damage

3. 3

   Disconnect the sensor plug and check the connector pins for corrosion, moisture ingress, or loose terminals (frequent causes of false sensor fault codes)

4. 4

   Verify the voltage supply and ground to the sensor using a multimeter

1. 1

   Secure the tractor

   Park the tractor on a level surface, engage the parking brake, and turn off the engine.

2. 2

   Locate the sensor

   Locate the transmission range position switch/sensor on the exterior of the gearbox housing.

3. 3

   Disconnect the harness

   Carefully disconnect the electrical harness connector from the sensor.

4. 4

   Remove the faulty sensor

   Unbolt and remove the faulty range position sensor from the transmission housing.

5. 5

   Clean the mounting surface

   Clean the mounting surface on the gearbox to ensure no dirt or debris enters the transmission.

6. 6

   Install the new sensor

   Install the new OEM transmission range sensor and tighten to factory specifications.

7. 7

   Reconnect the harness

   Reconnect the electrical harness, ensuring the plug clicks securely into place.

8. 8

   Clear code and test drive

   Connect a diagnostic tool to the tractor, clear the 04.01.08 fault code from the TRANS module, and test drive the tractor. Shift between high and low ranges to ensure smooth engagement and verify the code does not return.