Case IH 17526 (DTC F27F) - ECU – Engine Control Module (ECM / ECU): Inducement system is locked due to 3 detections in 40 hours (repeat offender)

This is a regulatory emissions lockout. The Selective Catalytic Reduction (SCR) system has detected an emissions-related fault (such as poor DEF quality, a failing NOx sensor, or tampering) three separate times within a 40-hour engine operating window. As a result, the engine control system activates an inducement lock (severely derating engine power or preventing engine starting) to prevent the machine from operating with a malfunctioning emissions system.

• MAXXUM T4E
• Farmall 40, 45, and 50 Tractors (with Cab and CVT Transmission)
• 240 Series Axial-Flow® Combines
• machines utilizing MTA CCM & APH Stage V MR architectures

1. 1

   Use the Case IH Electronic Service Tool (EST) to pull all active codes and identify the root-cause SCR fault (e.g., 17538 or 17571)

2. 2

   Verify the DEF tank is full and check the fluid for contamination or poor quality

3. 3

   Inspect all connectors to the ECU and Dosing Control Unit (DCU) to ensure they are undamaged, properly seated, and locks are not broken

4. 4

   If CAN communication codes are present, test the CAN network using a multimeter (should read 60 ohms of resistance between CAN HI and CAN LO wires)

1. 1

   Repair the Root Cause

   Fix the underlying emissions issue that caused the 3 detections (e.g., drain and replace contaminated DEF, replace a faulty NOx sensor, or repair damaged CAN wiring).

2. 2

   Connect Diagnostic Tool

   Connect the Case IH Electronic Service Tool (EST) to the machine's diagnostic port.

3. 3

   Perform the Reset

   Navigate to the dealer service tool screen and select the "Engine Restart Counter Reset" function. Note: The system cannot be unlocked without performing this specific software reset.

4. 4

   Clear Codes

   Clear all inactive fault codes from the ECM.

5. 5

   Retest

   Cycle the key and run the machine to verify the inducement lock is removed and no new SCR faults populate.