AFM DFM Disabler for Chevy Silverado GMC Sierra 1500

1. What does an AFM/DFM Disabler do?

The AFM/DFM Disabler is a plug-and-play OBD-II device designed to prevent compatible GM vehicles from entering Active Fuel Management (AFM) or Dynamic Fuel Management (DFM) cylinder-deactivation mode.

While connected, it helps keep the engine operating in full-cylinder mode for a more consistent driving experience.

2. What vehicles is this AFM/DFM Disabler compatible with?

It is designed for select GM gasoline vehicles equipped with compatible AFM/DFM systems, including certain:

• Chevy Silverado 1500
• GMC Sierra 1500
• Chevy Tahoe
• GMC Yukon
• Chevy Suburban
• GMC Yukon XL
• Chevy Avalanche
• Chevy Colorado
• GMC Canyon
• Cadillac Escalade
• Camaro, Corvette, and other select GM vehicles

Compatibility varies by year, model, engine, transmission, and vehicle configuration. Always check the complete fitment chart before ordering.

3. Will it fit my 5.3L or 6.2L Silverado/Sierra?

It is compatible with many select 5.3L and 6.2L gasoline Silverado 1500 and Sierra 1500 applications within the supported model years.

However, engine size alone does not guarantee compatibility. Please verify your exact year, engine, transmission, and vehicle generation before purchase.

4. Is it compatible with 10-speed transmission models?

No. This specific AFM/DFM Disabler is not compatible with 10-speed transmission models.

Please confirm your vehicle's transmission before ordering.

5. Does it work with 2022+ Refresh Silverado or Sierra models?

No. This device is not compatible with 2022+ Refresh models.

Some earlier 2022 configurations may differ, so owners of 2022 vehicles should verify their exact vehicle generation before purchase.

6. Does this require a tuner or ECU reflash?

No separate tuner is required for normal operation on a compatible vehicle.

The device connects directly to the OBD-II port and is designed to operate without permanent ECU reprogramming or flashing.

7. How do I install the AFM/DFM Disabler?

Installation is simple:

1. Locate the vehicle's OBD-II port.
2. Plug the AFM/DFM Disabler firmly into the port.
3. Start the vehicle.
4. Allow the device to complete its startup process.
5. Confirm the LED indicators are operating normally.
6. Drive normally.

No cutting, wiring, or special tools are required.

View Installation & User Manual (PDF)

8. Can I return the vehicle to factory AFM/DFM operation?

Yes. Simply unplug the device from the OBD-II port to return the vehicle to its factory AFM/DFM control strategy.

The device is designed to be fully reversible and does not permanently modify the ECU.

9. Is this compatible with Duramax diesel engines?

No. This AFM/DFM Disabler is designed for select GM gasoline engines only and is not compatible with Duramax diesel engines.

Please verify your engine type before ordering.

10. Does this product add horsepower or prevent AFM lifter failure?

This product is not a horsepower tuner and does not claim to increase the engine's rated peak horsepower.

It is also not a mechanical AFM delete kit and does not replace or remove AFM lifters. It should not be considered a guaranteed solution for preventing or repairing lifter failure.

Its primary purpose is to help keep compatible engines in full-cylinder mode by disabling AFM/DFM cylinder-deactivation operation.

Shipping & Delivery Policy

At DieselPerf, we specialize in high-performance diesel emission system accessories. Our mission is simple: to deliver the parts you need with maximum efficiency, security, and transparency. Below are the guidelines we follow to ensure your order reaches you safely.

1. Perfecting Your Delivery

To ensure a seamless experience and avoid unnecessary surcharges, please keep the following in mind:

• Precision Matters: Always verify your shipping address at checkout. Accurate data prevents costly rerouting fees.
• Address Classification: Carriers determine rates based on zoning. If your business is located in a residential area, it will be classified and billed at the Residential Delivery rate.
• Stay Reachable: Please provide a valid phone number. Carriers often need to coordinate delivery windows; missed connections can lead to significant delays.

2. Order Consolidation

To get your parts to you as fast as possible, we ship items as they become available. This means your order may arrive in multiple packages. Rest assured, you will never be charged extra for these split shipments.

3. Our Logistics Network

We partner with world-class carriers, including UPS, FedEx, DHL, USPS, and Amazon Logistics.

• Global Fulfillment: We fulfill orders from our strategic hubs in the U.S. and Hong Kong, prioritizing the location closest to you.
• Lead Times: While most orders arrive within 5–15 business days, specialty items or factory-direct shipments may require additional transit time.

4. Damaged or Missing Shipments

Your satisfaction is our priority. If your order arrives compromised, please follow this protocol:

For Damaged/Incomplete Deliveries:

1. Document Immediately: Note any visible damage or missing pieces on the delivery receipt before signing.
2. Contact Us: Reach out within 2 business days at service@DieselPerf.com or via phone at +1 325-013-1608 / +852 5381 0098.
3. Preserve Evidence: Keep all original packaging and take clear photos of the damage to expedite your claim.

For Lost Shipments:
If a package goes missing, we will initiate a dock check with the carrier (typically taking 2–7 business days). If the items cannot be located, we will work with you to provide a full replacement or a refund.

5. Estimated Timeframes

• Processing: Orders are generally dispatched from our warehouse within 1–2 business days.
• Transit: Standard U.S. ground shipping typically takes 7–10 business days, though many items arrive sooner.
• Holiday & External Factors: Please account for seasonal peaks (Christmas, Thanksgiving, etc.) and unforeseen "Force Majeure" events like extreme weather, which may naturally extend delivery windows.

Customer Support

Our team is here to help you get back on the road.

• Hours: Monday – Friday | 9:00 AM – 6:00 PM
• Email: service@DieselPerf.com

All Dieselperf products enjoy a 1-year limited warranty starting from the date of goods receipt, covering defects in product materials and workmanship.

Warranty Coverage

This warranty only covers failures arising from original material and manufacturing defects under proper installation and normal use. The warranty is non-transferable and exclusively available to the original buyer. An order number or valid purchase receipt is mandatory for warranty claims.

Warranty Exclusions

The 1-year limited warranty does not apply to the following circumstances:

• Normal wear and tear and surface scratches generated during regular use
• Damage caused by improper installation, unauthorized disassembly or modification
• Damage resulting from misuse, accidental impact, negligence and natural disasters
• Natural aging loss of consumable spare parts
• Labor costs incurred from product disassembly, assembly and maintenance

Warranty Claim Process

1. Submit Application: Email customer service with your order number, detailed fault description and clear photos or videos of product defects.
2. Claim Review: Our technical team will verify the issue. Additional information or product return inspection may be required.
3. Settlement Solutions: Upon claim approval, we reserve the right to take one of the following measures:

• Repair the defective product
• Replace with a brand-new authentic item
• Deliver compatible replacement parts for repair

Limitation of Liability

Within the scope permitted by law, Dieselperf shall not be responsible for any special, incidental, indirect or consequential losses, including but not limited to profit losses, business suspension losses and other economic damages.