Massey Ferguson U 2869 (11) – Engine Control Module (ECM) or Dosing Control Unit (DCU): CAN Frame Error: Range error of Urea tank temperature

This indicates a communication issue on the Controller Area Network (CAN) bus where the signal being broadcast by the Diesel Exhaust Fluid (DEF/AdBlue) tank level sensor is outside of the expected or plausible range. The system cannot accurately determine how much urea is in the tank, which is critical for the Selective Catalytic Reduction (SCR) emissions system to function.

• Massey Ferguson 8600 Series Tractors (e.g.
• MF 8670
• MF 8690)
• Tractors equipped with Sisu Tier 3 / Tier 4i / Stage V engines (such as the Citius series 44
• 49
• 66
• 74
• and 84 engines)

1. 1

   Visually inspect the DEF tank temperature sensor and its wiring harness for physical damage, rubbing, or corrosion.

2. 2

   Check the CAN SCR harness (circuit X244) and the sensor connector for loose pins, moisture ingress, or crystallized DEF fluid.

3. 3

   Perform a plausibility test using a diagnostic scan tool to read live DEF tank temperature data and compare it to ambient temperature (extreme readings like -40°C or +150°C indicate internal failure).

4. 4

   Test the sensor circuit for a short to the battery, short to ground, or an open load.

5. 5

   Check DEF fluid quality to ensure the tank is not contaminated with diesel, water, or dirt, which can foul the sensor.

1. 1

   Turn off the tractor, remove the key, and disconnect the negative battery terminal.

2. 2

   Locate the DEF/AdBlue tank and thoroughly clean the area around the top of the tank/sensor mounting flange to prevent any dirt or debris from falling into the tank.

3. 3

   Disconnect the electrical connector from the DEF sensor head.

4. 4

   If applicable, disconnect the heated DEF supply and return lines from the sensor head. Cap the lines immediately to prevent contamination or crystallization.

5. 5

   Unscrew or unbolt the retaining ring holding the DEF sensor unit in the tank.

6. 6

   Carefully extract the old sensor rod assembly from the tank.

7. 7

   Insert the new DEF sensor assembly, ensuring the new O-ring/seal is properly seated to prevent leaks and moisture ingress.

8. 8

   Secure the retaining ring, reconnect the heated fluid lines, and plug in the electrical connector.

9. 9

   Reconnect the battery, turn the ignition on, and use a diagnostic tool to clear the U 2869 (11) fault code.

10. 10

    Run the engine and monitor the live DEF temperature data to verify the repair.