KEEP YOUR ENGINE RUNNING ON ALL CYLINDERS.

Stop unwanted cylinder deactivation without tuning, flashing or permanently modifying your factory ECU.

Simply plug the module into your vehicle's OBD2 port and let it handle the rest.

Choose between two versions:

LEGACY GM VERSION

AFM / DFM / DOD DISABLER

For compatible older V6 & V8 cars, trucks and SUVs.

Disables AFM / DFM cylinder deactivation
Keeps V6 / V8 engines in full-cylinder mode

NEW-GENERATION 10-SPEED VERSION

DFM + AUTO START/STOP DISABLER

For compatible newer 5.3L & 6.2L V8 trucks and SUVs.

DFM OFF
AUTO START/STOP OFF — AUTOMATICALLY, EVERY START
ALL 8 CYLINDERS — EVERY DRIVE

TWO GENERATIONS. ONE SIMPLE SOLUTION.

OBD2 PLUG & PLAY

NO ECU TUNE

NO ECU FLASH

NO REPROGRAMMING

NO WIRE SPLICING

FULLY REVERSIBLE

PLUG IN. START. DRIVE.

1. KEEP YOUR V6 OR V8 IN FULL-CYLINDER MODE

THE ENGINE YOU BOUGHT — WITHOUT CONSTANT CYLINDER DEACTIVATION.

AFM and DFM are designed to deactivate cylinders under certain driving conditions in an effort to reduce fuel consumption.

That means your engine can repeatedly switch between full-cylinder and reduced-cylinder operation while you drive.

This OBD2 module stops that behaviour.

LEGACY VERSION

Disables compatible:

AFM
DFM
DOD / Cylinder Deactivation

and keeps compatible V6 and V8 engines operating in full-cylinder mode.

No more unwanted switching into reduced-cylinder operation.

NEW-GENERATION VERSION

Designed for compatible newer 5.3L and 6.2L V8 trucks and SUVs using GM's newer DFM system.

The module overrides the cylinder-deactivation command so the engine remains in:

FULL V8 MODE.

ALL 8 CYLINDERS.

EVERY DRIVE.

No constant shuffling between different cylinder patterns.

No reduced-cylinder cruising mode.

Just the complete V8 you bought the vehicle for.

2. NEW-GENERATION VERSION ALSO TURNS OFF AUTO START/STOP

STOP PRESSING THE BUTTON EVERY SINGLE DRIVE.

On many newer vehicles, manually disabling Auto Start/Stop only works for the current drive.

Shut the vehicle off.

Start it again.

And Auto Start/Stop turns itself back on.

The New-Generation 10-Speed Version handles that automatically.

Every time you start the vehicle, the module disables Auto Start/Stop for you.

NO MORE ENGINE SHUTDOWN AT RED LIGHTS

NO MORE PRESSING THE BUTTON AFTER EVERY START

NO MORE AUTOMATIC RESTART WHEN YOU RELEASE THE BRAKE

Your engine stays running when you stop.

Take-offs remain consistent.

And you don't have to remember to disable the system every time you get behind the wheel.

AUTO START/STOP OFF — AUTOMATICALLY, EVERY START.

IMPORTANT

This Auto Start/Stop function applies to the New-Generation Version.

The Legacy Version is primarily an AFM / DFM / DOD cylinder-deactivation disabler and should not be purchased specifically for Auto Start/Stop removal.

3. TWO FIXES. ONE OBD2 PLUG.

NEW-GENERATION VERSION

Instead of installing:

One device for DFM

plus

another device for Auto Start/Stop,

the New-Generation Version handles both through one OBD2 module.

DFM OFF

•  

AUTO START/STOP OFF

ONE MODULE. ONE PORT. TWO PROBLEMS SOLVED.

No second module.

No additional wiring.

No tearing apart the dashboard.

No separate Auto Start/Stop eliminator.

4. NO TUNE. NO FLASH. NO FACTORY SOFTWARE REWRITE.

KEEP YOUR FACTORY ECU.

This is not an ECU tune.

It does not require permanently changing the vehicle's factory calibration.

There is:

NO ECU FLASH

NO REPROGRAMMING

NO CUSTOM TUNE

NO COMPUTER REMOVAL

NO ECM WIRING

NO WIRE SPLICING

The module communicates with the vehicle through the existing OBD2 port.

Your factory software remains intact.

FACTORY ECU. DIFFERENT DRIVING BEHAVIOUR.

5. PLUG & PLAY INSTALLATION

NO MECHANIC. NO TOOLS. NO DASH REMOVAL.

Installation couldn't be much simpler.

STEP 1 — FIND THE OBD2 PORT

Locate the rectangular OBD2 diagnostic port underneath the driver's side dashboard.

STEP 2 — PLUG IN THE MODULE

Insert the correct version directly into the port.

STEP 3 — START THE VEHICLE

Allow the module to communicate with the vehicle.

STEP 4 — DRIVE

The system automatically handles the supported cylinder-deactivation functions.

For the New-Generation Version, Auto Start/Stop is also disabled automatically.

INSTALLS IN MINUTES.

No cutting.

No splicing.

No radio removal.

No engine-computer installation.

6. FULLY REVERSIBLE

WANT FACTORY OPERATION BACK? UNPLUG IT.

Nothing is permanently removed.

Nothing is permanently rewritten.

Simply remove the module from the OBD2 port and the vehicle returns to normal factory control behaviour.

PLUGGED IN

Cylinder deactivation disabled.

New-Generation Version also automatically disables Auto Start/Stop.

UNPLUGGED

Vehicle returns to its normal factory operating logic.

NO PERMANENT MODIFICATION.

Ideal for drivers who want an easily removable solution instead of permanent tuning or engine modifications.

DESIGNED TO REDUCE CONSTANT AFM / DFM CYCLING

FEWER CYLINDER-DEACTIVATION EVENTS.

AFM and DFM repeatedly activate and deactivate cylinders while the vehicle is being driven.

The deactivation system relies on specialised components including lifters that repeatedly transition between operating states.

By keeping the engine in full-cylinder mode, the module stops the repeated cylinder-deactivation cycling during normal operation.

The result is a driving setup designed to:

ELIMINATE UNWANTED CYLINDER DEACTIVATION

REDUCE REPEATED AFM / DFM LIFTER CYCLING

HELP PREVENT FUTURE DFM-RELATED WEAR

KEEP ENGINE RESPONSE MORE CONSISTENT

MAINTAIN FULL-CYLINDER OPERATION

PREVENTION — NOT A REPAIR.

If your engine already has:

• A ticking lifter

• A misfire

• Camshaft damage

• Existing lifter damage

• Existing engine damage

the module will not repair damaged mechanical components.

Existing engine problems should be inspected and repaired first.

A MORE CONSISTENT DRIVING EXPERIENCE

NO MORE CYLINDER-MODE SHUFFLING.

When cylinder deactivation is active, the engine can repeatedly transition between different operating modes depending on speed, throttle position and engine load.

Disable the system and the engine response becomes more consistent.

FULL-CYLINDER POWER

The engine remains in its normal full-cylinder configuration.

CONSISTENT THROTTLE RESPONSE

No changing between reduced and full-cylinder operation.

V8 FEELS LIKE A V8

On the New-Generation Version, compatible engines stay on all eight cylinders.

NO AUTO STOP INTERRUPTION

New-Generation vehicles also stop shutting the engine off automatically at traffic lights.

SMOOTHER. MORE CONSISTENT. MORE LIKE THE ENGINE YOU BOUGHT.

CHOOSE THE CORRECT VERSION

VERSION 1 — LEGACY GM

AFM / DFM / DOD DISABLER

Designed for a broad range of compatible older:

V6 + V8 Cars
Trucks
SUVs

Main function:

AFM / DFM OFF

Keeps compatible engines in full-cylinder operating mode.

CHOOSE LEGACY VERSION IF:

Your vehicle appears in the Legacy Compatibility List below.

This version is intended for older AFM / DFM applications and is not the correct choice for the newer Refresh / Global-B style 10-speed vehicles listed under the New-Generation Version.

VERSION 2 — NEW-GENERATION 10-SPEED

DFM + AUTO START/STOP DISABLER

Designed specifically for compatible newer:

5.3L V8

and

6.2L V8

trucks and SUVs.

Main functions:

DFM OFF

plus

AUTO START/STOP OFF

CHOOSE NEW-GENERATION VERSION IF:

You have one of the specifically listed newer 10-speed trucks or SUVs below.

NEW-GENERATION 10-SPEED COMPATIBILITY

CHEVROLET

Silverado 1500

2022.5–2026

5.3L V8 — L84
6.2L V8 — L87

Tahoe

2021–2024

5.3L V8
6.2L V8

Suburban

2021–2024

5.3L V8
6.2L V8

GMC

Sierra 1500

2022.5–2026

5.3L V8 — L84
6.2L V8 — L87

Yukon

2021–2024

5.3L V8
6.2L V8

Yukon XL

2021–2024

5.3L V8
6.2L V8

WHAT DOES “2022.5” MEAN?

GM refreshed the Silverado and Sierra partway through the 2022 model year.

The New-Generation Version is intended for the refreshed 2022.5 vehicle.

A common visual indicator is the newer interior featuring the large horizontal centre display.

2022 REFRESH

Choose:

NEW-GENERATION 10-SPEED

2022 LIMITED / OLDER BODY STYLE

Do not automatically select the New-Generation Version.

Check the Legacy Compatibility requirements before ordering.

NEW-GENERATION VERSION — NOT COMPATIBLE WITH

2.7L TURBOMAX

3.0L DURAMAX DIESEL

CADILLAC ESCALADE

2025–2026 TAHOE

2025–2026 SUBURBAN

2025–2026 YUKON / YUKON XL

UNSUPPORTED 10-SPEED GLOBAL-A APPLICATIONS

Always confirm year + model + engine before ordering.

IMPORTANT — CHECK FOR RPO CODE YK9

2021–2022 5.3L OWNERS: CHECK BEFORE BUYING.

During the semiconductor shortage, some 2021–2022 5.3L vehicles were manufactured from the factory without active DFM and Auto Start/Stop functionality.

These vehicles may carry:

RPO CODE YK9

If your 5.3L vehicle has YK9, there may be no active DFM or Auto Start/Stop system to disable.

In that case, this module is unnecessary.

The 6.2L application was not affected in the same way.

5.3L + 2021/2022?

CHECK YK9 BEFORE ORDERING.

LEGACY VERSION COMPATIBILITY

CHEVROLET MODELS

2014–2018 Silverado 1500 — V6 4.3L
2007–2018 Silverado 1500 — V8 5.3L / 6.2L
2007–2014 Silverado 1500 — V8 6.0L

2014–2018 Suburban — V6 4.3L
2007–2018 Suburban — V8 5.3L
2007–2014 Suburban — V8 6.0L
2010–2018 Suburban — V8 6.2L

2007–2018 Tahoe — V8 5.3L
2007–2014 Tahoe — V8 6.0L
2010–2018 Tahoe — V8 6.2L

2005–2009 Trailblazer — V8 5.3L

2018 Traverse — V6 3.6L

2007–2013 Avalanche — V8 5.3L
2007–2009 Avalanche — V8 6.0L
2010–2013 Avalanche — V8 6.2L

2016–2018 Camaro — V6 3.6L
2010–2019 Camaro — V8 6.2L

2011–2019 Caprice PPV — V8 6.0L / 6.2L

2015–2019 Colorado — V6 3.6L

2012–2019 Corvette — V8 6.2L

2008–2009 Equinox Sport — V6 3.6L

2007–2009 Impala — V6 3.9L
2006–2009 Impala — V8 5.3L

2008–2012 Malibu — V6 3.6L
2007–2009 Malibu — V6 3.9L
2006 Malibu Maxx — V6 3.9L

2006–2008 Monte Carlo — V8 5.3L

2006–2008 Uplander — V6 3.9L

2014–2018 SS — V8 6.2L

GMC MODELS

2014–2018 Sierra 1500 — V6 4.3L
2007–2018 Sierra 1500 — V8 5.3L
2007–2014 Sierra 1500 — V8 6.0L
2010–2018 Sierra 1500 — V8 6.2L

2010–2018 Sierra Denali — V8 6.2L

2007–2018 Yukon / Yukon XL — V8 5.3L
2007–2014 Yukon / Yukon XL — V8 6.0L
2010–2018 Yukon / Yukon XL — V8 6.2L

2007–2018 Yukon Denali / Denali XL — V8 6.0L / 6.2L

2007–2008 Acadia — V6 3.6L

2010–2018 Canyon — V6 3.6L

2005–2009 Envoy — V8 5.3L

CADILLAC MODELS

2010–2018 Escalade — V8 5.3L / 6.0L / 6.2L

2010–2018 Escalade ESV — V8 5.3L / 6.0L / 6.2L

2010–2018 Escalade EXT — V8 5.3L / 6.0L / 6.2L

2016–2018 CT6 — V6 3.6L

2004–2018 CTS — V6 3.6L

2016–2019 XT5 — V6 3.6L

2013–2018 XTS — V6 3.6L

2012–2019 ATS — V6 3.6L

2004–2009 SRX — V6 3.6L

2005–2007 STS — V6 3.6L

BUICK MODELS

2016–2018 LaCrosse — V6 3.6L

2006–2020 LaCrosse — V8 5.3L

2005–2008 LaCrosse CXS — V6 3.6L

2006–2007 Rendezvous — V6 3.9L

2004–2007 Rendezvous CXL / Ultra — V6 3.6L

2008–2018 Enclave — V6 3.6L

2005–2009 Rainier — V8 5.3L

2018 Regal GS — V6 3.6L

2006–2008 Terraza — V6 3.9L

IMPORTANT LEGACY VERSION NOTICE

The Legacy Version is intended for compatible older AFM / DFM vehicles.

It is not intended for newer 2022 Refresh / Global-B applications that require the New-Generation 10-Speed Version.

For long periods when the vehicle will not be driven, remove the Legacy module from the OBD2 port to avoid unnecessary battery drain.

CHECK YEAR + MODEL + ENGINE BEFORE ORDERING.

LEGACY VS. NEW-GENERATION

FEATURE	LEGACY VERSION	NEW-GENERATION 10-SPEED
OBD2 Plug & Play	✓	✓
AFM / DFM Disable	✓	✓
Keeps Full Cylinder Mode	✓	✓
Compatible V6	✓	—
Compatible V8	✓	✓
All 8 Cylinders on Compatible V8	✓	✓
Auto Start/Stop Off Every Start	—	✓
No ECU Tune	✓	✓
No ECU Flash	✓	✓
No Reprogramming	✓	✓
Unplug to Return to Factory Behaviour	✓	✓
Wire Splicing	None	None
Permanent Modification	None	None
Primary Vehicle Generation	Older AFM / DFM Models	Newer 10-Speed DFM Models

WHICH VERSION DO I NEED?

CHOOSE LEGACY VERSION IF:

Your exact year, model and engine appears in the Legacy Compatibility List.

Typical applications include older:

• Silverado

• Sierra

• Tahoe

• Suburban

• Yukon

• Escalade

• Camaro

• Corvette

• Selected GM V6 cars and SUVs

CHOOSE NEW-GENERATION 10-SPEED IF:

You have:

2022.5–2026

Silverado 1500 / Sierra 1500

with:

5.3L V8 or 6.2L V8

OR

2021–2024

Tahoe / Suburban / Yukon / Yukon XL

with:

5.3L V8 or 6.2L V8

WHAT THIS DEVICE IS NOT

NOT A TUNE

It does not require custom engine tuning.

NOT AN ECU FLASH

Factory software is not rewritten.

NOT AN ENGINE DELETE KIT

No internal engine components are removed.

NOT PERMANENT

Unplug the module to return to factory operation.

NOT A REPAIR DEVICE

It will not repair an already damaged lifter, camshaft or engine component.

THE TRADE-OFF

FULL-CYLINDER OPERATION VS. LIGHT-LOAD FUEL SAVINGS.

AFM and DFM exist partly to reduce fuel consumption during light-load driving.

Keeping all cylinders active removes that cylinder-deactivation fuel-saving strategy.

That means fuel consumption during certain light-load cruising conditions may increase.

In exchange, you get:

FULL-CYLINDER OPERATION

NO AFM / DFM CYCLING

MORE CONSISTENT ENGINE RESPONSE

and on the New-Generation Version:

NO AUTO START/STOP AT EVERY TRAFFIC LIGHT

For drivers who prioritise consistent engine behaviour and reduced cylinder-deactivation cycling, that's the trade-off.

INSTALL IN MINUTES

1. LOCATE

Find the OBD2 port underneath the driver's side dashboard.

2. PLUG IN

Insert the correct module.

3. START

Start the vehicle and allow the unit to communicate.

4. DRIVE

No computer programming.

No mechanic.

No permanent modification.

PLUG IN. START. DRIVE.

PRODUCT SPECIFICATIONS

Product Type:
OBD2 AFM / DFM Cylinder-Deactivation Disabler

Available Versions:

LEGACY GM VERSION

AFM / DFM / DOD Disabler

NEW-GENERATION 10-SPEED VERSION

DFM + Auto Start/Stop Disabler

Connection:
OBD2

Installation:
Plug & Play

Tools Required:
None

ECU Tune Required:
No

ECU Flash Required:
No

Factory ECU Reprogramming:
No

Wire Splicing:
No

Permanent Modification:
No

Reversible:
Yes

Return to Factory Operation:
Remove module from OBD2 port

LEGACY VERSION FUNCTIONS

AFM OFF

DFM OFF

DOD / CYLINDER DEACTIVATION OFF

FULL-CYLINDER OPERATION

V6 + V8 APPLICATIONS

FACTORY ECU REMAINS UNCHANGED

NEW-GENERATION VERSION FUNCTIONS

DFM OFF

ALL 8 CYLINDERS

AUTO START/STOP OFF EVERY START

5.3L + 6.2L V8

FACTORY ECU REMAINS UNCHANGED

FULLY REVERSIBLE

PACKAGE CONTENTS

1 × OBD2 Disabler Module

1 × User / Installation Guide

Select the correct Legacy or New-Generation version before checkout.

FREQUENTLY ASKED QUESTIONS

DOES IT REPROGRAM MY ECU?

No.

The module communicates through the vehicle's OBD2 port and does not require tuning, flashing or permanently rewriting the factory ECU.

CAN I REMOVE IT?

Yes.

Simply unplug the module to return the vehicle to its normal factory operating behaviour.

DOES THE LEGACY VERSION DISABLE AFM / DFM?

Yes.

The Legacy Version is designed to disable AFM / DFM / cylinder-deactivation operation on compatible V6 and V8 applications.

DOES THE LEGACY VERSION TURN OFF AUTO START/STOP?

Auto Start/Stop elimination is not the primary function of the Legacy Version.

If you need simultaneous DFM + Auto Start/Stop disabling on a compatible newer vehicle, select the New-Generation 10-Speed Version.

DOES THE NEW-GENERATION VERSION DISABLE DFM?

Yes.

It keeps compatible 5.3L and 6.2L V8 engines operating on all eight cylinders.

DOES THE NEW-GENERATION VERSION ALSO DISABLE AUTO START/STOP?

Yes.

It automatically turns Auto Start/Stop off every time the compatible vehicle is started.

No need to press the factory button on every drive.

DO I NEED A MECHANIC?

No.

Installation is performed directly through the driver's-side OBD2 port.

No specialist tools, computer programming or engine disassembly are required.

WILL IT FIX AN ALREADY DAMAGED LIFTER?

No.

It is designed to stop future AFM / DFM cylinder-deactivation cycling.

It cannot reverse existing mechanical damage.

If the engine already has ticking, misfires or other symptoms, have the vehicle inspected first.

WHAT IF I HAVE A 2021–2022 5.3L WITH YK9?

Some 2021–2022 5.3L vehicles equipped with RPO code YK9 were built without active DFM and Auto Start/Stop.

If your vehicle has YK9, there may be nothing for the module to disable.

Check before ordering.

DOES IT FIT A 2.7L OR 3.0L DIESEL NEW-GENERATION TRUCK?

No.

The New-Generation Version is specifically intended for compatible:

5.3L V8

and

6.2L V8

applications.

DOES IT FIT A 2022 SILVERADO OR SIERRA?

It depends on which 2022 version you own.

REFRESHED 2022.5

Use the New-Generation Version if the engine and vehicle match the fitment list.

2022 LIMITED / OLDER PLATFORM

Do not select the New-Generation Version based on year alone.

Verify the Legacy fitment requirements first.

ONE PRODUCT PAGE. TWO GENERATIONS.

LEGACY GM

AFM / DFM OFF

V6 + V8

BROAD OLDER-MODEL COMPATIBILITY

OR

NEW-GENERATION 10-SPEED

DFM OFF

AUTO START/STOP OFF

ALL 8 CYLINDERS

NEWER 5.3L + 6.2L V8

NO TUNE. NO FLASH. NO PERMANENT MODIFICATION.

PLUG IT IN.

KEEP YOUR CYLINDERS ACTIVE.

DRIVE THE VEHICLE THE WAY YOU WANT IT TO DRIVE.