General Motors is reducing the environmental impact of its new models by installing the automatic stop-start engine feature. The feature is so pervasive, four out of seven 2021 GMC models are equipped with it.
Looking over a list of the latest 2021-model-year GMC models, we find the 2021 GMC Acadia, the 2021 GMC Sierra 1500, the 2021 GMC Terrain, and the 2021 GMC Yukon all equipped with automatic stop-start. As such, the majority of new GMC models get the fuel-saving feature.
|GMC Sierra 1500||A1|
|GMC Sierra HD||-|
- S – Standard with all trim levels and powertrains.
- Not available with 4.3L V6 LV3 and 5.3L V8 L82 engines.
As a reminder, vehicles equipped with automatic stop-start will automatically shut down the engine when at a stop, such as in heavy traffic, at a stoplight, or while parked. As such, the vehicle conserves fuel, with upwards of six percent higher fuel economy returns in the city compared to similarly equipped vehicles without automatic stop-start.
As soon as the driver removes their foot from the brake, the engine automatically restarts, allowing the vehicle to once again drive forward.
While automatic stop-start is a great way to eke out a few extra mpg in the city, some owners have criticized the feature as being overly disruptive. With the engine turned off at a stop, critics say that automatic stop-start can result in a slight hesitation off the line, as well as additional vibrations in the cabin as the engine restarts after the driver removes their foot from the brake pedal. Some models come equipped with the ability to turn the feature off, such as the Cadillac XT5, while some owners have devised workarounds to ensure the feature doesn’t activate.