P0172 CHEVROLET Meaning The Engine Control Module controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open Loop and Closed Loop. The 4.3 Liter Vortec engine is built by General Motors. This is a V6 engine that has had a long history, although much has changed along the way. The 4.3L Vortec built today is certainly significantly different from the original Vortec first offered in the mid-1980s. The list of cars that have used the 4.3L Vortec is a long one. This engine has ...