Fendt 04.1.50 – Transmission Control Unit (Transmission TCU / EST Module): S017 - 'Transmission oil filter clogged' switch

The transmission oil filter is clogged or heavily contaminated. The system logs this when the S017 switch detects restricted flow/pressure changes indicative of a blocked filter.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• 309 Vario
• 310 Vario
• 311 Vario
• 312 Vario
• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 716 Vario
• 815 Vario
• 817 Vario
• 818 Vario
• 916 Vario
• 920 Vario
• 922 Vario
• 924 Vario
• 926 Vario
• 927 Vario
• 930 Vario
• 933 Vario
• 936 Vario

1. 1

   Check transmission oil temperature (must be above 50°C/122°F for the S017 switch to be active)

2. 2

   Physically inspect the transmission oil filter for actual contamination, sludge, or debris

3. 3

   Perform a plausibility check on the S017 switch (e.g., if it shows contamination when the engine is off, the switch is likely stuck)

4. 4

   Test the wiring harness linking the S017 switch to the TCU for short-circuits, open circuits, or signal line faults

1. 1

   Warm Up the Machine

   Run the tractor until the transmission oil temperature exceeds 50°C to ensure the S017 switch circuit is active.

2. 2

   Service the Filter

   Drain the necessary fluid and remove the transmission oil filter. Clean the housing and install a new transmission oil filter.

3. 3

   Test the System

   Clear the fault codes and operate the tractor. If the fault code 04.1.50 does not return, the issue was simply a dirty filter.

4. 4

   Test the Switch

   If the filter is brand new and the code immediately returns, use a multimeter to test the S017 filter contamination switch for proper resistance and verify the 8.5V supply/ground at the connector.

5. 5

   Replace the Switch

   If the switch fails the continuity/plausibility test (e.g., reading closed when there is no pressure differential), replace the S017 switch.