The term “powertrain” refers to the parts that work together to move the vehicle forward. These components include the engine, transmission, driveshaft, axles, and differential. Therefore, a powertrain malfunction or defect refers to a problem with either the engine or transmission. Some of the issues that can lead cause problems with the powertrain include coolant leaks, faulty spark plugs, and oil starvation. If there is a defect that affects these elements, powertrain issues can arise, which can result in the check engine light turning on, rough ideal, fluid leaks, and no power in the vehicle.