Why does the 6.0 Cummings diesel go into a high idle?

The 6.0-liter Cummins diesel engine can go into high idle due to various reasons, such as a need for increased power during heavy loads or when the engine temperature drops below a certain threshold. High idle can also be triggered by specific control modules to maintain optimal operating conditions, improve fuel efficiency, or ensure proper engine lubrication. Additionally, it may activate during certain diagnostic tests or when the vehicle's systems detect an issue that requires increased engine RPMs for better performance.