Case IH 19801 (F-5246-00) - ECU – Engine Control Unit (ECU): SCR Inducement: Level 3 (creep mode), triggered by Tampering fault

The system has detected a condition that resembles an attempt to bypass, defeat, or disconnect the Selective Catalytic Reduction (SCR) emissions system, activating Level 3 (creep mode) which severely restricts engine power and vehicle speed.

• VESTRUM CVX
• Case IH 240 Series Axial-Flow® Combines
• Case IH T7 Series (Tier 4B) Tractors
• Case IH Farmall 40-45-50-115U Tractors

1. 1

   Scan the ECU for other active root cause fault codes (e.g., blocked EGR valve, blocked DEF/AdBlue dosing valve code 19817, disconnected sensors, or repeated offender logic).

2. 2

   Visually inspect the SCR wiring harness, NOx sensors, and DEF dosing module for aftermarket emulators or bypass devices.

3. 3

   Inspect the DEF quality sensor, dosing valve, and downstream oxidation catalyst temperature sensors for cut wires, corrosion, or unplugged connectors.

1. 1

   Repair root cause

   Based on secondary fault codes found during diagnosis, repair or replace the failed component (e.g., clean/replace a blocked DEF dosing valve, replace a faulty NOx sensor, or repair damaged wiring).

2. 2

   Remove emulators

   If an SCR bypass device was installed, remove it and restore the OEM wiring.

3. 3

   Perform validation restart

   Activate the Service Inducement Validation Restart mode using diagnostic software, as the inducement logic will not clear automatically after part replacement.

4. 4

   Execute full power restart

   Execute a full power restart as prompted by the diagnostic software to allow the ECU to validate that the SCR system is fully functional and emissions are within legal limits, deactivating Level 3 creep mode.