Can You Disable Afm With a Scan Tool

Last Updated on May 13, 2023 by Ryan

Yes, you can disable AFM with a scan tool. The process is simple and only takes a few minutes.

  • Disconnect the negative battery cable
  • Remove the engine cover
  • Locate the AFM assembly on top of the engine near the front passenger side cylinder head
  • Unplug the electrical connector from the AFM assembly
  • Use a flat-head screwdriver to remove the two bolts that secure the AFM assembly to the cylinder head, then remove the assembly and discard it

Disabling AFM (Active Fuel Management) with a scan tool is a topic of increasing interest for car owners seeking to optimize their engine performance and address potential issues associated with cylinder deactivation. 

However, it is crucial to approach this subject with caution, as it involves legal considerations, potential impacts on fuel economy, and specific steps that must be followed diligently. 

In this comprehensive guide, we will delve into the intricacies of disabling AFM with a scan tool, providing accurate information, expert insights, and actionable advice to ensure that readers can make informed decisions regarding their vehicles. 

By exploring the legal implications, understanding the benefits and drawbacks, and providing a step-by-step process, this guide aims to empower car owners with the knowledge needed to navigate the realm of disabling AFM effectively and responsibly.

How To Disable Active Fuel Management AFM or DOD Easy and Free

Benefits and Drawbacks of Disabling AFM:

Disabling AFM (Active Fuel Management) with a scan tool is a decision that car owners should carefully consider, weighing the potential benefits against the drawbacks. By understanding the advantages and disadvantages, individuals can make an informed choice based on their specific needs and circumstances.


  1. Improved Performance: One of the primary benefits of disabling AFM is the potential for enhanced performance. Some car owners have reported a reduction in engine “surge” or “hesitation” during acceleration after disabling AFM. This can result in a smoother driving experience and increased responsiveness.
  2. Avoiding Potential Issues: Certain vehicles may experience problems associated with AFM, such as oil consumption or lifter failures. Disabling AFM can mitigate these issues and potentially extend the lifespan of the engine.
  3. Simplified Maintenance: With AFM disabled, car owners may experience simpler maintenance procedures. They can avoid dealing with potential AFM-related complications, such as oil consumption monitoring or lifter replacements, leading to reduced maintenance costs over time.


  1. Decreased Fuel Economy: One significant drawback of disabling AFM is the potential impact on fuel economy. AFM is designed to optimize fuel consumption by deactivating cylinders when not needed, improving overall efficiency. Disabling AFM may lead to a decrease in fuel economy, resulting in higher fuel costs over time.
  2. Potential Legal Implications: It is essential to consider the legal implications of disabling AFM, as it may violate federal or state emission regulations. Disabling AFM could result in penalties or other legal consequences, depending on local laws and enforcement. Car owners should thoroughly research and understand the legal requirements before proceeding.
  3. Long-Term Engine Health: AFM is an engineered system designed to balance performance and efficiency. Disabling AFM means permanently deactivating this feature, potentially affecting the long-term health and reliability of the engine. Car owners should carefully evaluate the potential consequences on the engine’s lifespan and overall durability.
  4. Warranty Considerations: Disabling AFM may void the vehicle’s warranty, depending on the manufacturer’s policies. It is crucial to review the warranty terms and consult with the manufacturer or dealership to understand the implications before proceeding with any modifications.

In conclusion, disabling AFM with a scan tool presents both benefits and drawbacks. Improved performance and avoidance of potential issues are among the advantages, while decreased fuel economy, potential legal implications, and long-term engine health concerns are significant drawbacks. 

Car owners should carefully evaluate these factors, consider their specific needs, and seek professional advice when necessary to make an informed decision regarding disabling AFM with a scan tool.

Step-by-Step Guide to Disabling AFM with a Scan Tool:

Disabling AFM (Active Fuel Management) with a scan tool requires careful attention to detail and adherence to specific steps. By following the process outlined below, car owners can effectively disable AFM and potentially address any associated issues. 

It is important to note that these steps are general guidelines, and specific procedures may vary depending on the vehicle’s make and model. Always refer to the manufacturer’s documentation and consult with professionals when in doubt.

Prepare the Necessary Tools and Equipment:

  • Obtain a compatible scan tool specifically designed for disabling AFM. Ensure that the scan tool supports the make and model of your vehicle.
  • Review the instructions provided with the scan tool to familiarize yourself with its functions and features.

Park the Vehicle in a Safe Location:

  • Choose a well-ventilated area with ample space around the vehicle.
  • Engage the parking brake and turn off the engine before proceeding.

Open the Vehicle’s Hood:

  • Locate the hood release lever inside the vehicle and activate it to release the hood latch.
  • Lift the hood and securely prop it open.

Connect the Scan Tool:

  • Locate the vehicle’s diagnostic port, typically found under the dashboard on the driver’s side.
  • Connect the scan tool to the diagnostic port using the provided cable or connector.
  • Ensure a secure connection between the scan tool and the vehicle’s diagnostic port.

Power on the Scan Tool:

  • Power on the scan tool by following the manufacturer’s instructions.
  • Allow the scan tool to initialize and establish communication with the vehicle’s onboard computer.

Access the AFM Disabling Function:

  • Navigate through the scan tool’s menu options to find the AFM disabling function.
  • This function may be labeled differently depending on the scan tool model but should be related to disabling AFM or cylinder deactivation.

Follow the On-Screen Prompts:

  • Once in the AFM disabling function, carefully read any instructions or warnings displayed on the scan tool’s screen.
  • Follow the on-screen prompts to initiate the AFM disabling process.
  • Be patient, as the scan tool may take some time to complete the disabling procedure.

Monitor the Scan Tool:

  • Pay close attention to the scan tool’s display throughout the disabling process.
  • Ensure that there are no error messages or abnormal readings.
  • If any issues or error codes arise, refer to the scan tool’s documentation or seek professional assistance.

Complete the AFM Disabling Process:

  • Once the scan tool indicates that the AFM disabling process is complete, follow any additional instructions provided.
  • Safely disconnect the scan tool from the vehicle’s diagnostic port.

Test the Vehicle:

  • Start the engine and observe its behavior after disabling AFM.
  • Check for any warning lights, unusual sounds, or performance issues.
  • Take the vehicle for a test drive, paying attention to acceleration, responsiveness, and overall engine performance.

It is important to note that disabling AFM using a scan tool may vary based on the vehicle’s specific make, model, and software version. It is recommended to consult the vehicle’s manufacturer documentation, and the scan tool’s user manual, or seek professional assistance for any specific steps or considerations pertaining to your vehicle.

Vehicle Compatibility and Considerations:

Disabling AFM (Active Fuel Management) with a scan tool is not universally applicable to all vehicle makes and models. It is important to understand the compatibility of your vehicle and consider specific factors before proceeding with disabling AFM. The following information provides guidance on vehicle compatibility and key considerations:

Compatibility with Scan Tools:

  • Different scan tools are designed to work with specific vehicle makes and models. Before attempting to disable AFM, ensure that your chosen scan tool is compatible with your vehicle. Consult the scan tool’s documentation or contact the manufacturer for compatibility information.

Vehicle Make and Model:

  • AFM systems can vary between different vehicle makes and models. While some vehicles may offer straightforward disabling procedures, others may require additional steps or considerations. Research your specific vehicle make and model to understand the compatibility and potential complexities involved.

Software Updates:

  • Manufacturers may release software updates or revisions that impact AFM functionality. Before attempting to disable AFM, check for any available updates for your vehicle’s software. Updating the software might affect the scan tool’s compatibility or provide alternative methods for disabling AFM.

Warranty Implications:

  • Disabling AFM may have implications for your vehicle’s warranty. Some manufacturers consider disabling AFM as a modification that voids the warranty. Review your vehicle’s warranty documentation or consult with the manufacturer or dealership to understand the potential warranty implications before proceeding.

Legal Considerations:

  • Check local laws and regulations regarding AFM modifications. In some regions, disabling AFM may be prohibited or violate emission requirements. It is crucial to understand and comply with the legal implications of disabling AFM to avoid penalties or legal consequences.

Professional Advice:

  • If you are uncertain about the compatibility or implications of disabling AFM in your specific vehicle, it is advisable to seek professional advice. Automotive technicians or experts can provide guidance based on their expertise and experience, ensuring that you make informed decisions.

Remember that disabling AFM is a decision that should be made based on thorough research, understanding the specific considerations for your vehicle, and consulting with professionals when necessary. By carefully evaluating compatibility, warranty implications, legal considerations, and seeking expert advice, you can make informed choices regarding disabling AFM with a scan tool.

Maintenance and Safety Recommendations:

After disabling AFM (Active Fuel Management) with a scan tool, it is important to follow proper maintenance practices and prioritize safety to ensure optimal vehicle performance and longevity. The following recommendations outline essential steps to take after disabling AFM:

Regular Maintenance:

  • Continue adhering to the manufacturer’s recommended maintenance schedule for your vehicle. Routine oil changes, filter replacements, and other maintenance tasks should still be performed as directed to maintain the overall health of the engine.

Monitor Engine Performance:

  • Pay close attention to the engine’s performance after disabling AFM. Observe for any changes in fuel consumption, unusual noises, or warning lights on the dashboard. If you notice any issues, consult with a qualified automotive professional to address them promptly.

Oil Consumption:

  • Some vehicles with disabled AFM may experience increased oil consumption. Monitor the oil levels regularly and check for any signs of excessive oil consumption, such as the frequent need for refills or visible leaks. If you notice abnormal oil consumption, consult with a professional to diagnose and address the issue.

Address Any Malfunctions or Warning Lights:

  • If you encounter any engine malfunctions or warning lights on the dashboard after disabling AFM, do not ignore them. These indicators may be unrelated to AFM and could signify other underlying issues. Seek professional diagnosis and repair to prevent further damage or performance issues.

Professional Assistance:

  • If you are not confident in your automotive knowledge or experience, it is advisable to consult with a qualified automotive technician or professional. They can provide guidance, perform necessary inspections, and address any concerns related to the disabling of AFM.

Safety Precautions:

  • When working on your vehicle or performing maintenance tasks, always prioritize safety. Follow proper safety procedures, such as wearing protective gloves, eye protection, and ensuring a stable and secure working environment. Refer to the vehicle’s user manual for specific safety recommendations.

Documentation and Record-Keeping:

  • Maintain a record of any modifications made to the vehicle, including disabling AFM. Keep receipts, documentation, or records of any professional services performed related to the AFM system. This documentation can be valuable for warranty claims, future maintenance, or potential vehicle sales.

Remember, disabling AFM may impact the overall performance and functionality of the vehicle. It is essential to stay vigilant, address any issues promptly, and seek professional assistance when needed. By following proper maintenance practices, monitoring engine performance, and prioritizing safety, you can ensure the continued reliability and longevity of your vehicle even after disabling AFM.

You Can See:

How to Disable Afm Without a Tune

If you want to disable AFM without a tune, there are a few things that you need to do. First, you need to find the AFM disable wire. This wire is usually located near the ECU.

Once you have found the wire, you need to cut it. This will effectively disable the AFM system. Next, you need to re-flash your ECU.

This can be done with a variety of different tools, but we recommend using an SCT X4 for this purpose. Once your ECU has been re-flashed, it will no longer try to engage the AFM system. Lastly, you’ll need to install a larger throttle body.

The stock throttle body is too small for the engine to breathe properly without AFM engaged, so upgrading to a larger throttle body is necessary. We recommend going with an 82mm throttle body for optimal results. Follow these steps and you’ll be able to disable AFM without needing a tune!

How to Disable Afm for Free

If you want to disable Afm for Free, there are a few things that you can do. One is to go into your settings and turn off the function. This can be done by going into your phone’s settings, then tapping on “More,” then “Cellular networks.”

From here, you can tap on the toggle next to “Advanced Calling” to turn it off. Another way that you can disable Afm for Free is by downloading a third-party app that will do it for you. There are a few different apps available, but we recommend disabling Force Fast Mode from the Google Play Store.

Once downloaded and installed, simply launch the app and tap on the “Disable” button. The app will then take care of everything else for you and Afm will be disabled on your device.

Unplugging Afm Solenoids

If your car has an AFM (active fuel management) system and you’re having trouble with the engine, one possible solution is to unplug the AFM solenoids. This will disable the AFM system and may fix the problem. Here’s how to do it:

First, find the AFM solenoids. They’re usually located on or near the intake manifold. In some cases, there may be two solenoids – one for each cylinder bank.

Once you’ve found the solenoids, disconnect the electrical connector from each one. Then, start the engine and see if it runs better without the AFM system being active. If so, that’s a good indication that the problem was with the AFM system itself and not something else in your engine.

Of course, this is just a temporary fix – eventually, you’ll want to get your car’s AFM system repaired or replaced. But if you’re in a pinch and need to get your car running again quickly, unplugging the AFM solenoids can be a lifesaver.

Can You Disable Afm With a Scan Tool


Can You Disable Afm With a Programmer?

Yes, you can disable AFM with a programmer. However, there are a few things to keep in mind before doing so. First, AFM is a federal emission requirement, so disabling it may not be legal in your state.

Second, AFM stands for Active Fuel Management and is GM’s trade name for cylinder deactivation. Disabling AFM will also disable cylinder deactivation, which could potentially lead to decreased fuel economy. Finally, if you do choose to disable AFM with a programmer, make sure to do your research and purchase a quality product from a reputable company – otherwise, you could end up doing more harm than good.

Can Gm Afm Be Turned Off?

Yes, the GM AFM can be turned off with a special tool. The process is not difficult but does require some knowledge of cars and how they work. Once the GM AFM is turned off, your car will no longer have the “surge” or “hesitation” when accelerating which is common with this feature.

How Do You Deactivate a Cylinder Deactivation?

Cylinder deactivation is a technology used in modern internal combustion engines to improve fuel economy. The idea is to shut down some of the engine’s cylinders when they are not needed so that less fuel is consumed. To deactivate a cylinder, the engine control unit (ECU) cuts off the fuel supply and spark to that particular cylinder.

The cylinder then stops firing and goes into an “inactive” state. When the ECU detects that more power is needed, it reactivates the cylinder by restoring fuel and spark. Cylinder deactivation can happen at any time and on any type of engine – petrol, diesel, or even electric.

However, it is most commonly found on V8 engines, as these typically have four cylinders that can be turned off without affecting performance too much. There are two main types of cylinder deactivation: mechanical and hydraulic. Mechanical deactivation uses valves to cut off fuel and spark to the inactive cylinders, while hydraulic deactivation uses oil pressure to do the same thing.

Deactivating cylinders can result in a significant reduction in fuel consumption – up to 20% in some cases. It also reduces emissions and improves engine efficiency overall.

What Cylinders Shut off With Afm?

In order to answer this question, it is first important to understand what AFM is and how it works. AFM stands for Active Fuel Management, and it is a system that GM vehicles use in order to improve fuel economy. The way it works is by shutting off certain cylinders when they are not needed, such as when the vehicle is idling or during light loads.

This can improve fuel economy by up to 5%. Now that we know how AFM works, we can answer the question of which cylinders shut off with AFM. The answer is that all cylinders may shut off at different times, depending on the needs of the vehicle.

For example, if the vehicle is idling, only some of the cylinders may be turned off. However, during light loads, all cylinders may be turned off periodically.


In conclusion, disabling AFM (Active Fuel Management) with a scan tool is a decision that requires careful consideration, understanding, and adherence to specific steps. This comprehensive guide has provided valuable information on the process, benefits, drawbacks, and considerations associated with disabling AFM.

We have emphasized the importance of understanding the legal implications, potential impacts on fuel economy, and long-term engine health. By being aware of these factors, car owners can make informed decisions that align with their specific needs and circumstances.

Additionally, we have provided a step-by-step guide outlining the process of disabling AFM with a scan tool. However, it is essential to consult the vehicle’s manufacturer documentation, scan the tool user manual, or seek professional assistance for any specific steps or considerations pertaining to your vehicle.

Moreover, we have highlighted the significance of vehicle compatibility, the importance of using quality products, and the need to prioritize maintenance and safety. Following these recommendations and seeking professional advice when necessary will help ensure the continued performance and reliability of your vehicle.

Remember, disabling AFM is not a decision to be taken lightly. It is crucial to evaluate the benefits and drawbacks, understand the legal and warranty implications, and prioritize safety and proper maintenance practices.

By considering all these aspects and making informed choices, car owners can navigate the realm of disabling AFM responsibly, optimizing their vehicle’s performance while maintaining compliance with legal requirements and ensuring long-term reliability.

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