Anyone pull the fuse for AFM ?

 

AFM doesn't have a fuse to disable it as far as I'm aware.

 

There is a fuse in # 13 position in the fuse box located between the seats . In the owners manual it shows both fuse box locations and what each fuse is for. It says AFM. I am not looking for a AFM valve or NPP exhaust valve fuse and that fuse is labeled AFM

 

AFM is a computer controlled feature, I don't believe there is a fuse to disble that but there are after market devices (Range Technologies) that do, or have it tuned out, which may void a warranty.

 

Range doesnt make anything for the C8, and we cannot tune the C8 yet either. I would have it tuned out if I could. There is a fuse in the fuse box between the seats per the owners manual in position 13 that says AFM.

 

Well, pull it and see what happens if you want.

 

See what happens.

 

I have thought of doing just that Kracka, my only hold back is the possibility of creating a hard to remove trouble code , one that may create a cel that will not shut off even after reinstall. But then again there are guys that pull out seats and get air bag codes and lights and they go away after reinstall and that is critical safety issues. I wanted to see if anyone has done it for feed back. If I do it, I will post the results.

 

The Fuse purpose say Active Fuel Management, not AFM. I do not want to report fake news LOL.

 

Maybe the engineers gave enthusiasts an easy way to disable it for free since so many spent money to do so on the C7? Maybe its an Easter egg, of sorts...

 

I just went through the all various C7 (2014-2019) trunk and engine bay fuse box diagrams and I see nothing in any of them for AFM. Seems like this is new for the C8, and suspect it'll work as the OP desires, similar to pulling the NPP fuse on C7s!

 

Pull it. If it sets a code, disconnect the battery for awhile, or erase with a code reader. It’s not going to be a hard fault(flashing engine light) because it’s controlled by a fuse.

 

Well, I did pull the Active Fuel Management fuse and drove the car about 5 miles, AFM V4 mode works exactly the same, no changes whatsoever. Did not get any lights or warnings, or bells, everything worked exactly the same, I reinstalled the fuse and am disappointed but glad I tried it.

 

Thanks bud, needed the confidence LOL

 

I noticed that, too, while looking for a fuse to pull, to disable the car to help prevent theft.
Thanks for trying it, and posting up the (no effect) result.

 

That fuse is for the exhaust valves, not for the AFM system. And many have reported that removing it will eventually throw a code.

 

So, you're saying the 2024 Owners Manual is incorrect?
Page 276 of the downloadable version shows it as

Better let GM/Chevrolet know, then?
Is there a thread on removing it will throw a code?
If many have reported it, I'd guess there is?

 

People have been talking about pulling a fuse to stop the AFM switching ever since the C8 first came out, I guess because you could do it on the C7. I have never seen any posts about that being successful on a C8.

 

No, the manual is not incorrect. But what he said is correct. Fuse 13 in the rear fuse panel is for the cylinder deactivation exhaust flow control valves (the AFM valves in the muffler). And yes, pulling it will set a DTC. The other fuse that controls the "tailpipe exhaust flow control valves" is a double fuse 20/21 also in the rear fuse panel. Pulling it will also set a DTC. And it will also disable some inside rearview mirror functions because that is what the other half of the fuse protects. Neither one will directly disable the actual cylinder deactivation functions.
When AFM activates, it closes the AFM valves in the muffler (and also the tailpipe flow control valves). It also activates the soleniods that cause the valve lifters to collapse, as well as introducing some micros slip in the clutch (reference the MidEngine Revolution book), and shuts off the fuel injectors to the deactivated cylinders. No single fuse disables all of that. The fuse for valve lifter solenoids is 31 in the rear fuse panel. It might cause AFM to be disable (folks have speculated) but you can see from its description in the Owners Manual, it also will shut down other things - and very likely set a DTC as well.

 

I was just about to return to this thread with a similar update, and apology for ever doubting you.
I found a youtube vid, that says basically the same thing, without the need for the schematics engineering degree requirement.
Sorry, but I don't read "techno" very well.
It was in another thread, same subject.
For those still curious why the #13 is marked AFM. This may help/clarify.