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The GMC AFM (Active Fuel Management) and DFM (Dynamic Fuel Management) systems have been a topic of concern among vehicle owners and potential buyers. These systems are designed to improve fuel efficiency by deactivating some of the engine’s cylinders under certain conditions. However, various recalls have been issued over the years due to issues associated with these technologies. In this article, we will explore the recall history of the GMC AFM and DFM systems and identify the models that have been affected.
Understanding AFM and DFM Systems
The AFM and DFM systems are innovations by General Motors aimed at optimizing fuel efficiency. The AFM system allows for the deactivation of half of the engine’s cylinders when full power is not needed, while the DFM system takes this a step further by allowing for variable cylinder deactivation, which can deactivate any number of cylinders based on driving conditions.
Recall History
Over the years, several recalls have been issued for vehicles equipped with AFM and DFM systems due to various issues, including engine stalling, loss of power, and potential safety hazards. Below, we outline some of the significant recalls associated with these systems.
- 2014 GMC Sierra 1500: This recall was issued due to a potential issue with the AFM system that could cause the engine to stall unexpectedly.
- 2015 GMC Yukon: A recall was initiated for the DFM system that could lead to reduced engine performance and increased emissions.
- 2016 Chevrolet Silverado: Issues with the AFM system prompted a recall, focusing on engine performance and reliability.
- 2019 GMC Sierra: The DFM system was recalled due to reports of engine noise and potential cylinder deactivation problems.
Affected Models
Several models from GMC and Chevrolet have been affected by the recalls concerning the AFM and DFM systems. Below is a list of some of the key models that have been impacted:
- GMC Sierra 1500 (2014-2021)
- GMC Yukon (2015-2021)
- Chevrolet Silverado 1500 (2014-2021)
- Chevrolet Tahoe (2015-2021)
- Chevrolet Suburban (2015-2021)
Common Issues Reported
Owners of affected models have reported several common issues related to the AFM and DFM systems, including:
- Engine stalling or shutting off while driving.
- Rough idling or engine misfires.
- Increased oil consumption.
- Check engine light activation.
What to Do If Your Vehicle Is Affected
If you own a vehicle that is part of the recall, it is essential to take action promptly. Here are the steps you should follow:
- Check Your VIN: Visit the National Highway Traffic Safety Administration (NHTSA) website to check if your vehicle’s VIN is listed under any recalls.
- Contact Your Dealer: Reach out to your local GMC or Chevrolet dealer to inquire about the recall and schedule any necessary repairs.
- Stay Informed: Keep up with any updates regarding recalls and safety notices from GMC or Chevrolet.
Conclusion
The GMC AFM and DFM systems have been subject to various recalls due to performance and safety concerns. It is crucial for owners of affected models to stay informed and take the necessary steps to address any potential issues. By being proactive, vehicle owners can ensure their safety and the reliability of their vehicles.