Massey Ferguson T122 – Transmission Control Module (TRANS1): Transmission Temperature Signal Out Of Range

The transmission hydraulic oil temperature sensor (X19) is registering an extreme value that falls outside of its normal operating parameters (above 150 °C or below -24 °C).

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624

1. 1

   Check the transmission oil level to ensure it is correct, as low fluid can cause rapid overheating

2. 2

   Inspect the tractor's radiators and oil coolers for blockages (dust, chaff, debris) that could be preventing proper cooling

3. 3

   Locate the transmission hydraulic oil temperature sensor (X19) and inspect the wiring harness and connector for damage, corrosion, open circuits, or a short circuit to ground or +12V

4. 4

   Test the sensor's (X19) resistance to determine if it has failed internally and is sending a false extreme temperature reading to the TRANS1 module

1. 1

   Clean the Cooling System

   If the radiators are blocked, thoroughly clean them using compressed air to restore airflow.

2. 2

   Correct Fluid Levels

   Top up the transmission hydraulic oil if it is found to be low.

3. 3

   Repair Wiring

   If the diagnostic checks reveal a broken wire or corroded connector at the X19 sensor, repair the wiring harness or replace the connector pigtail.

4. 4

   Replace the Sensor

   If the wiring is intact but the sensor is reading out of range (or if the transmission is physically cold but the sensor reads >150 °C), replace the transmission hydraulic oil temperature sensor.

5. 5

   Module Verification

   If the sensor and wiring are both confirmed good, the fault may lie within the transmission module itself, which will require dealer-level software diagnostics.