Case IH 3368 – Engine Control Unit (ECU / ENG): Info: Torque Limitation due to OBD Performance Limiter by Legislation

Informational code indicating that the engine control system has actively placed the machine into a 'derate' mode, which limits fueling and reduces engine torque. This torque limitation is a legally mandated response triggered by another active engine or emissions-related fault. Symptoms include loss of power, difficulty starting, excessive smoke, or increased fuel consumption.

• Farmall
• Steiger T4B
• Magnum series (235 - 340 Series 4)
• Steiger series (350, 400, 450, 500, 550, 600)
• Puma series (165, 180, 195, 210, 225)
• Quadtrac
• Rowtrac

1. 1

   Connect a diagnostic scan tool (such as the CNH Electronic Service Tool - EST) to the machine's diagnostic port.

2. 2

   Read all active and stored fault codes in the Engine ECU.

3. 3

   Look for the primary fault code that triggered the 3368 derate (typically an emissions-related code like DEF quality, SCR catalyst efficiency, NOx sensor faults, or a fuel injection system error).

4. 4

   Do not attempt to clear the 3368 code directly as your first step; it is an informational code that will remain active as long as the primary fault is present.

1. 1

   Identify primary fault

   Identify the primary active fault code using the diagnostic tool.

2. 2

   Troubleshoot primary fault

   Follow the OEM service manual troubleshooting steps for that specific primary fault code.

3. 3

   Repair primary fault

   Repair or replace the failed component causing the primary fault (e.g., replace a faulty NOx sensor, clean a clogged DEF doser, or replenish contaminated DEF fluid).

4. 4

   Clear primary fault codes

   Once the physical repair is complete, use the diagnostic tool to clear the primary fault codes.

5. 5

   Perform system test

   Depending on the primary fault, you may need to perform a system test, a forced stationary regeneration, or run the engine under load at operating temperature to satisfy the ECU that the emissions system is functioning correctly.

6. 6

   Verify repair

   Once the ECU verifies the primary system is repaired, the 3368 OBD Performance Limiter code will automatically clear, and full engine torque will be restored.