Case IH 3638 – EDC (Electronic Diesel Control) / Engine ECU: Torque limitation due to NTC

This is a secondary, informational fault code indicating that the engine control system has actively initiated a power reduction (derate) that limits engine torque. This specific torque limitation is triggered by an engine brake shut-off event.

• Case IH and New Holland equipment with FPT Tier 3 and Tier 4a engines

1. 1

   Connect a diagnostic tool (such as the CNH EST tool) to the machine

2. 2

   Pull all active and stored fault codes from the EDC

3. 3

   Look for the primary active fault code that triggered the engine brake shut-off event (the failure triggering the torque limitation should also be active)

1. 1

   Identify the Root Cause

   Diagnose and repair the primary active fault code that is present alongside code 3638 (likely a code related to the engine brake, exhaust flap actuator, or a critical engine sensor).

2. 2

   Perform the Repair

   Replace the faulty component or repair the wiring harness associated with the primary code.

3. 3

   Clear Codes

   Once the primary issue is physically repaired, use the diagnostic tool to erase all fault codes.

4. 4

   Verify

   Cycle the key and run the engine to verify that the primary code does not return and that the 3638 torque limitation code has successfully cleared, restoring full engine power.