Case IH 19126 – Engine Control Module (ECM) / Engine Control Unit (ECU): SCR Inducement: Warning, triggered by Tampering fault

The system has detected a condition that it interprets as an intentional bypass, disconnection, or tampering with the Selective Catalytic Reduction (SCR) / DEF emissions system. This is an inducement code, meaning it triggers a warning system that will eventually lead to engine power loss (derate) or creep mode (Level 3 inducement) if the root cause is not resolved. Note: This code is almost always a secondary code triggered by a primary failure (such as a disconnected sensor, a blocked dosing valve, or contaminated DEF fluid).

• Tier 4b
• 240 Series Axial-Flow Combines
• Farmall
• Magnum
• Steiger
• Maxxum
• Puma

1. 1

   Check for primary fault codes (e.g., 19141, 19140, 19144, 19145) as 19126 is usually a secondary inducement warning.

2. 2

   Inspect the DEF/AdBlue tank for fluid contamination (diesel fuel, water, or off-spec fluid).

3. 3

   Inspect the SCR system wiring harness and connectors, specifically at the DEF quality sensor and dosing valve, for corrosion, damage, or unplugged connections.

4. 4

   Verify that no aftermarket DEF emulators or 'delete kits' have been installed.

1. 1

   Resolve the Primary Fault

   Repair the root cause identified in the diagnostic checks (e.g., replace a failed DEF quality sensor, replace a damaged wiring harness, or clean a blocked DEF dosing valve).

2. 2

   Address Fluid Contamination

   If code 19141 or 19140 was present, drain the DEF/AdBlue tank completely, clean/flush the tank, and refill it with fresh, approved DEF/AdBlue solution.

3. 3

   Remove Aftermarket Devices

   If a DEF emulator is present, remove it and restore the OEM wiring.

4. 4

   Clear Codes and Reset Inducement

   Once the physical repair is complete, connect the Case IH Electronic Service Tool (EST). You must clear the fault codes and perform an SCR system/inducement reset via the EST software to take the machine out of limp mode and unlock the ECU.