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Marathon Active Fuel Management Module - M1000X

Suggested retail: $226.95
Holiday Sale: $183.56
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Orders placed by 2 PM MT, with the exception of weekends and holidays, will ship the same business day


The DiabloSport Marathon Module helps you get better fuel mileage by enabling your V8 engine to behave like a four-cylinder engine when cruising, while still allowing for full V8 power when you need it.


Easy installation. Just plug into the OBDII port under the dash and drive.
Compatible with GM vehicles built from 2005 to current that feature Active Fuel Management (AFM).
Enables vehicles with AFM to drop cylinders in order to suit the driver\'s power requirements, while conserving fuel.
Saves fuel by allowing vehicle to stay in 4-cylinder mode 80% of the time as opposed to only 35% from the factory.


Pending 50 state legal emissions.


Not available for sale or use on pollution controlled vehicles in the state of California.

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Marathon Active Fuel Management Module is rated 4.0 out of 5 by 1.
Rated 4 out of 5 by from Slight improvement in mpg I see a slight improvement in average mpg. I know some of their other products can be updated. If this can I suggest making it go to V4 mode at idle and up to 1,200-1,300 RPM. Since there’s no hesitation in going to V8 mode when you STEP on it I don’t think a update like this would be a problem.
Date published: 2018-11-28
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Will it void my factory warranty on my 2018 Sierra SLT

Asked by: Dvmashe
This product should have absolutely no effect on your warranty on your vehicle. As a plus, you can unplug it from the OBD2 port before service and that will completely prevent any trace of the device to be present.
Answered by: Marketing MB
Date published: 2018-12-07

Will this increase the issue of oil consumption? Also will this interfere with the onstar features like remote start and lock/unlock?

Asked by: Carlos
Oil consumption is caused when it switches back and forth between 4 and 8 cylinder. Disable 4 cylinder mode to reduce oil consumption
Answered by: Chevydude
Date published: 2018-10-16

can intune 13 do this also

Asked by: gangstabilly
Yes, the I-3 can turn off the AFM/DoD system on any vehicle it supports.
Answered by: Mike M
Date published: 2018-09-11

Does the I-3 can tune the Active Fuel Management to work more efficient???

Asked by: Lupillo

Is it possible for the Marathon to be updated to switch to V4 mode when the engine is at idle, and in stop and go traffic at 5-10 mph or 1000-1,200 rpm?

Asked by: Robert2010

Will this work in conjunction with other diablosport tuners?

Asked by: Jedi0621

Will the Marathon module work on an 08 Cadillac Escalade EXT? AFM was not included on these engines until 2010 so it's not standard or tuned from what I've researched. 

Asked by: Inygmaz
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