Valtra E090 – Transmission: Oil Temperature Below –20 °C

The transmission oil temperature sensor is reporting a value of –20 °C or lower. Unless the machine has been cold-soaking in extreme ambient temperatures, this is an implausible reading that typically indicates a malfunction in the sensor's circuit.

• 6000 Series
• 8000 Series
• N Series
• T Series

1. 1

   Verify ambient temperature to confirm the tractor has not been cold-soaking at or below -20 °C (if true, the code may be legitimate and systems just need to be warmed).

2. 2

   Visually inspect the wiring harness and connectors for the transmission oil temperature sensor for signs of damage, corrosion, or loose connections.

3. 3

   Test the sensor's resistance to determine if its output falls within a plausible range.

4. 4

   Check for other related fault codes, such as sensor supply voltage errors, which could indicate a broader electrical issue.

1. 1

   Locate the sensor

   Find the gearbox oil temperature sensor (often designated B14) on the transmission housing. On 6000 series tractors, look for switch S16 on the front or outer face of the valve block.

2. 2

   Perform Diagnostic Checks

   Complete the diagnostic checks listed above to rule out wiring or connection issues.

3. 3

   Replace the sensor

   If wiring is intact and the sensor tests faulty, replace it. Ensure the engine and transmission are cool. Clean the area, remove the old sensor, apply thread sealant to the new sensor's threads, and tighten to manufacturer specifications. Reconnect the electrical connector.

4. 4

   Clear fault codes

   Use a diagnostic tool to clear the fault code from the control unit's memory.

5. 5

   Verify repair

   Operate the tractor and monitor the transmission oil temperature to ensure plausible readings. Check the transmission oil level and top up if necessary.