How do you force a duramax into regeneration mode?

To force a Duramax diesel engine into regeneration mode, you typically need to use a diagnostic tool or scan tool that can communicate with the vehicle's onboard computer. This tool can initiate the regeneration process by commanding the engine control module (ECM) to enter active regeneration. Alternatively, you can drive the vehicle under specific conditions—such as at highway speeds for a sustained period—while ensuring the exhaust temperature is high enough to trigger the regeneration process naturally. Always refer to the owner's manual or service manual for specific instructions related to your model.