Diesel Repair Blog for Trucks and RVs

If you've ever had a diesel truck, semi, or motorhome suddenly lose power and heard someone say, “The engine is derated,” you may wonder what that actually means. A derate occurs when the vehicle's control system intentionally limits engine power, torque, RPM, vehicle speed, or some combination of them because it has detected a condition that requires attention. In other words, the engine may be physically capable of making more power, but the computer is intentionally not al