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Pulling DFM fuses

03blackz71
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03blackz71 Senior Enthusiast

03blackz71

Posted
Posted

On the Trailboss forum some guys are pulling the DFM fuses to disable it.   They are pulling fuses 60 and 67.   All that did it have no issues or check engine lights.

 

I was thinking doing it but wanted to see if anyone here have done it to there trucks.

 

Here is a link to there topic

https://www.trailboss.org/threads/pulling-dfm-fuse.481/

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BlancoSilverado
BlancoSilverado

Alright everyone,    First went for a drive and verified that i can see the DFM activate, which i saw. i am using an Autel MP808   i pulled over shut off the engine pulled fuse 60

voided3
voided3

That's a bummer. I would be so happy if there was a way to make it so "D" was the same as "L7" on the gear selector so I wouldn't have to toggle up every single time.  I'd be even happier if cylinder

Firehawk99
Firehawk99

Well I tried this and my truck ran like crap! It was shifting all wonky and started hard. I put them back in and it's back to normal. I have a 21 6.2 trail boss.

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voided3 Enthusiast

voided3

Posted
Posted

You have my attention. I currently drive our truck in L7 to disable DFM, but that would be super convenient if pulling those two fuses works as then I could just put it in D.

 

I also would be curious for anyone with a '21 that was built without DFM has those two fuses present or not. If the non-DFM 5.3 and 6.2 trucks don't have fuses 60 and 67 from the factory, I would view that as a good sign that it's an effective method.

haider320 Enthusiast

haider320

Posted
Posted (edited)

Just checked. I have 60 & 67 and DFM is not installed on my 21.

Edited by haider320
voided3 Enthusiast

voided3

Posted
Posted
1 hour ago, haider320 said:

Just checked. I have 60 & 67 and DFM is not installed on my 21.

Interesting. I wonder if they leave them in there even if they aren't being used?

WeGone Enthusiast

WeGone

Posted
Posted

I currently drive in L9 around town. I will definitely be watching this. Maybe someone with a scanner could try it to confirm it.

Atlas Senior Enthusiast

Atlas

Posted
Posted

I am of the understanding that driving in any "L" gear/ driving in Manual Mode does NOT disable DFM.

 

This is a change from the AFM trucks, where selecting an L gear in manual mode would disable AFM.

 

Can anyone confirm this?

voided3 Enthusiast

voided3

Posted
Posted
Just now, NorthskyblueT1 said:

I am of the understanding that driving in any "L" gear/ driving in Manual Mode does NOT disable DFM.

 

This is a change from the AFM trucks, where selecting an L gear in manual mode would disable AFM.

 

Can anyone confirm this?

Driving in L7 on the 8-speed or L9 on the 10-speed does disable DFM on the L84 5.3 or L87 6.2 with DFM.

 

Driving in L8 on the 8-speed or L10 on the 10-speed, however, does not; you have to lock out the final overdrive gear to disable it. Driving in L8 or L10 is the same as D on these trucks.

kmeleon Enthusiast

kmeleon

Posted
Posted
16 minutes ago, voided3 said:

Driving in L7 on the 8-speed or L9 on the 10-speed does disable DFM on the L84 5.3 or L87 6.2 with DFM.

 

Driving in L8 on the 8-speed or L10 on the 10-speed, however, does not; you have to lock out the final overdrive gear to disable it. Driving in L8 or L10 is the same as D on these trucks.

Correct

kmeleon Enthusiast

kmeleon

Posted
Posted
1 hour ago, WeGone said:

I currently drive in L9 around town. I will definitely be watching this. Maybe someone with a scanner could try it to confirm it.

I have a scanner but I'm not sure if there's something that we can monitor to show dfm.... Does anyone know? 

03blackz71 Senior Enthusiast

03blackz71

Posted
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Posted
3 hours ago, haider320 said:

Just checked. I have 60 & 67 and DFM is not installed on my 21.

 

Thanks for checking.    I was going to ask if someone could comfrm that.

 

I bet they programmed it off.    They probably use the same fuse block as before and just leave the fuses in.

Silverado4x4 Senior Enthusiast

Silverado4x4

Posted
Posted

I can always tell when the DFM kicks in by watching the instant mpg on the cluster, when it kicks in on level ground and the gas pedal is kept in one spot say at 60mph the instant milage will jump to the upper 30s or so and soon as I push the pedal slightly down it will drop to the upper teens to low 20s when the DFM disengages.

Silverado4x4 Senior Enthusiast

Silverado4x4

Posted
Posted
2 hours ago, 03blackz71 said:

 

Thanks for checking.    I was going to ask if someone could comfrm that.

 

I bet they programmed it off.    They probably use the same fuse block as before and just leave the fuses in.

It's programmed off due to no chip.

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kmeleon Enthusiast

kmeleon

Posted
Posted
16 hours ago, Firehawk99 said:

Well I tried this and my truck ran like crap! It was shifting all wonky and started hard. I put them back in and it's back to normal. I have a 21 6.2 trail boss.

Strange, my 5.3 runs perfectly fine without them

Just waiting for someone to confirm if this actually shuts off dfm. I think it does from the way it drove last night but I want to know for sure. 

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