Some operating conditions, such as long idling, don't generate enough engine heat for the diesel to automatically burn off soot in the diesel particulate filter. That's where available Operator-Commanded Regeneration with Active Inhibit (diesel only) comes in. When the warning light comes on, pushing the activation button raises the exhaust temperature to burn off the soot, after which the exhaust temperature reverts to normal. The active inhibit feature allows delay of regeneration when the vehicle is sitting over combustible materials, such as dry leaves or grass. Once in a safe place, the driver can manually start the regeneration process. Recommended for commercial applications.