Some General Motors engines use Active Fuel Management (AFM) to save fuel by deactivating cylinders when they are not needed. For example, AFM can improve fuel economy by up to 8% during highway cruising.
However, this system can cause several problems. Many owners of GM vehicles equipped with AFM have reported issues ranging from increased fuel consumption to engine knocking and reduced power. Sometimes, the only way to fix the problem has been to disable the AFM system entirely.
What Are the Common Active Fuel Management Problems in a 6.2 engine?
The most common issue GM vehicle owners with AFM report is increased fuel consumption. It is usually first noticed during highway driving. The engine will switch to operating on fewer cylinders when cruising at a constant speed.
However, the fuel savings are not always as much as expected. In some cases, AFM can even cause an increase in fuel consumption.
Other common problems include engine knocking or pinging and reduced power. Sometimes, the only way to fix these problems has been to disable the AFM system entirely.
How Can I Fix Active Fuel Management Problems?
If you're experiencing any of the issues with your AFM-equipped 6.2-liter engine, here are some potential solutions:
- Have the AFM system disabled. A qualified mechanic can do this to ensure that your engine always runs on all cylinders.
- Use higher octane fuel. This will help prevent engine knocking and reduce the likelihood of cylinder deactivation.
- Keep your engine well maintained. A well-maintained engine will experience fewer problems with AFM, so be sure to follow your car's recommended maintenance schedule.
- If you experience engine knocking, have the problem diagnosed and repaired as soon as possible. Ignoring the problem might not be wise; it could lead to further damage or engine failure.
If you're having problems with your AFM-equipped vehicle, these potential solutions can help get your car back on the road. Be sure to consult a qualified mechanic if you're unsure about how to proceed.
Contacting GM Customer Service
Suppose you're having problems with your AFM-equipped vehicle and can't find a fix in the owner's manual or service bulletins. In that case, you may want to contact GM customer service.
They may be able to provide you with additional information or help you troubleshoot your issue. In addition, you can reach GM customer care.
Additional Resources
If you're having problems with your AFM-equipped vehicle, here are some additional resources that may be helpful:
- The GM Owner Center is a website where GM owners can find owner manuals, warranty information, and other resources.
- The NHTSA (National Highway Traffic Safety Administration) is the government agency responsible for investigating vehicle safety issues. Does your vehicle has a safety defect? Then, file a complaint with the NHTSA.
- The Better Business Bureau (BBB) is a nonprofit organization that provides ratings and reviews of businesses, including dealerships and auto repair shops. You can search for businesses in your area on the BBB website.
Conclusion
So, if you're still having problems with your AFM-equipped vehicle, there are a few things you can do to try to fix the issue.
Check your owner's manual or service bulletins for a fix, take your vehicle to a qualified mechanic or dealership, or contact GM customer service.
Finally, you may also want to file a complaint with the NHTSA or check the BBB for business ratings and reviews.
About the authors
The CarAraC research team is composed of seasoned auto mechanics and automotive industry professionals, including individuals with advanced degrees and certifications in their field. Our team members boast prestigious credentials, reflecting their extensive knowledge and skills. These qualifications include: IMI: Institute of the Motor Industry, ASE-Certified Master Automobile Technicians; Coventry University, Graduate of MA in Automotive Journalism; Politecnico di Torino, Italy, MS Automotive Engineering; Ss. Cyril and Methodius University in Skopje, Mechanical University in Skopje; TOC Automotive College; DHA Suffa University, Department of Mechanical Engineering
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