Will disabling AFM void warranty?
Active Fuel Management (AFM) is a technology used in many modern vehicles to improve fuel efficiency by deactivating certain engine cylinders under light load conditions. While some vehicle owners consider disabling AFM to enhance performance or avoid potential mechanical issues, a common concern is whether this modification will void the vehicle's warranty. In this article, we’ll explore the implications of disabling AFM and what you need to know before making this decision.
What Is Active Fuel Management (AFM)?
AFM is a system primarily found in General Motors (GM) vehicles, designed to improve fuel economy by shutting off half of the engine’s cylinders when full power isn’t needed. For example, in a V8 engine, AFM can deactivate four cylinders during highway cruising or light driving conditions. While this feature can save fuel, some drivers report issues such as increased oil consumption or lifter failures, prompting them to consider disabling the system.
Does Disabling AFM Void Your Warranty?
The short answer is: it depends. Here are the key factors to consider:
- Manufacturer’s Policy: Most vehicle manufacturers, including GM, state that modifications to the engine or its control systems can void the powertrain warranty. Disabling AFM typically requires reprogramming the Engine Control Module (ECM) or using an aftermarket device, which is considered a modification.
- Magnuson-Moss Warranty Act: Under this federal law, a manufacturer cannot void your entire warranty simply because you modified your vehicle. However, if the modification (in this case, disabling AFM) is proven to cause a failure, the manufacturer has the right to deny warranty coverage for the affected components.
- Dealer Discretion: Warranty claims are often handled at the dealership level. Some dealerships may be more lenient, while others may strictly enforce warranty terms. Disabling AFM could raise red flags during diagnostics, especially if the modification is detected through ECM scans.
In summary, while disabling AFM doesn’t automatically void your entire warranty, it can lead to warranty denial for engine-related repairs if the modification is deemed responsible for the issue.
What Are the Risks of Disabling AFM?
Before deciding to disable AFM, it’s important to weigh the potential risks:
- Warranty Denial: As mentioned earlier, disabling AFM can result in warranty claims being denied for engine or powertrain issues.
- Increased Fuel Consumption: Disabling AFM means your engine will operate with all cylinders active at all times, which can reduce fuel efficiency.
- Potential Legal Issues: In some regions, modifying emissions-related systems (which may include AFM) could violate local laws or regulations.
- Resale Value: Modifications like disabling AFM can affect the resale value of your vehicle, as some buyers may prefer a factory-original setup.
While disabling AFM may address certain performance concerns, it’s essential to consider these risks and consult with a trusted mechanic or dealership before proceeding.
Conclusion: Should You Disable AFM?
Disabling AFM is a personal decision that depends on your priorities and willingness to accept potential consequences. If you’re experiencing issues with AFM or want to improve performance, it’s worth discussing your options with a qualified mechanic. At Kevin’s Autos, we specialize in helping vehicle owners make informed decisions about their car’s maintenance and modifications. Feel free to reach out to us for expert advice and reliable service!
Frequently Asked Questions
Can you disable AFM with a scan tool?
For some drivers, these changes in engine performance are distracting or unwanted, which leads them to disable AFM altogether. While there are many ways to disable the system, using a scan tool is one of the most direct methods, and it can often be done without needing any extra devices or hardware.
Can you turn off AFM with a scan tool?
For some drivers, these changes in engine performance are distracting or unwanted, which leads them to disable AFM altogether. While there are many ways to disable the system, using a scan tool is one of the most direct methods, and it can often be done without needing any extra devices or hardware.
What happens if you disable AFM?
When you eliminate the AFM system, the extra oil isn't needed. Excess oil will be pushed out of the pressure relief valve in the oil pan. This will spray oil on the bottom of the cylinder walls. This can cause oil burning, especially in high-rpm engines.
What voids GM extended warranty?
Your limited warranty could be voided if the systems and parts under warranty are damaged by any of the following: Damage due to accident, misuse or alteration. Damage or corrosion due to environment, chemical treatments or aftermarket products.
Can an AFM disabler cause problems with a Chevy Silverado?
However, AFM-equipped GM vehicles like the Escalade, Tahoe, Silverado, Yukon, Sierra, or Suburban are prone to having low oil pressure or oil consumption issues, shuddering, excessive combustion chamber deposits, and lifter or camshaft problems related to cylinder deactivation.
Does AFM cause engine damage?
Increased Wear and Tear: AFM-related problems can cause additional stress on engine components, leading to accelerated wear and potential long-term damage if left unresolved. This can result in costly repairs and premature engine failure.
What modifications do not void warranty?
What are some modifications that don't void a car warranty? Wheels, tires, shocks, cat-back exhausts, lighting, exterior styling upgrades, and manufacturer-approved parts/tunes allow added performance or customization without warranty conflicts.
Does an AFM disabler void warranty?
Unlike reprogramming the ECU or fully deleting the system, a plug-and-play disabler device does not void factory warranty.
Is there a class action lawsuit against GM for lifter failure?
Which vehicles are impacted? The GM engine valve-lifter class action lawsuit seeks damages for anyone who purchased or leased any 2014 to 2021 Buick (see also Buick lemon law), Cadillac, Chevrolet, and GMC vehicle equipped with a 5.3L, 6.0L or 6.2L V8 engine, and include the following cars: 2014 to present GMC Sierra.
Does disabling AFM improve MPG?
Additionally, if you happen to spend all of your driving time in the range where the factor AFM V4 mode is the most efficient (and the V8 disabler turns it off), you will see an additional hit to the mileage (usually around 1 mpg).
