DOD (Displacement on Demand) and AFM (Active Fuel Management) is a General Motors technology that improves gas mileage by shutting down half of the cylinders under light-load conditions to reduce fuel consumption.
There are a few reasons why vehicle owners want this option turned off (deleted):
Many people find the four-cylinder sound annoying if their vehicle has a louder aftermarket exhaust
Some drivers want the V6 or V8 power under their foot at all times
AFM lifters have a history of failing and oil consumption can be a problem
If this is something you want turned off on your vehicle or need more information, please give Prater's Automotive repair a call.