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Any lifter failures in 5.3 without DFM

Nutmeg
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Nutmeg Enthusiast

Nutmeg

Posted
Posted

Was interested if any of the trucks shipped without DFM have had any lifter failures? Understand they have all the same mechanical parts so am concerned as I have a 2021 Sierra with a May build date. Outside the known date but since the hours were high compared to the miles thinking it may have been one that was idle tested.

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newdude
newdude

We've sold a bunch, zero in the field factory DFM disabled failures that I can report.  SupremePizza said "yes" on the first page, I replied to him to give any recent examples, never responded.  

haider320
haider320

Build date 10/21 and no DFM.  I only have 1100 miles on the truck though.  So far so good.  Fingers crossed...   

newdude
newdude

Have yet to see any with failure.           Got any examples of lifter failure of a factory DFM disabled truck?  We've sold a bunch, some over 10K on them, no failures.  

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milkmaster Enthusiast

milkmaster

Posted
Posted (edited)

Not so far!  Only 5k miles though.  Built in June 21

Edited by milkmaster
Supreme Pizza Senior Enthusiast

Supreme Pizza

Posted
Posted
12 hours ago, Nutmeg said:

Was interested if any of the trucks shipped without DFM have had any lifter failures? Understand they have all the same mechanical parts so am concerned as I have a 2021 Sierra with a May build date. Outside the known date but since the hours were high compared to the miles thinking it may have been one that was idle tested.

 

 

Yes.

 

 

Flatblack83 Enthusiast

Flatblack83

Posted
Posted

There have been quite a few, its hit and miss. They did a poll on face book, it seemed like 10% have had problems with lifter failure and an occasional  bent pushrod. The mileage goes all over too, from 50 miles to 120k..lol

Nutmeg Enthusiast

Nutmeg

Posted
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Posted
13 hours ago, Supreme Pizza said:

 

 

Yes.

 

 

Well that kills a couple of the theories. Do you know if they are using the standard DFM lifters as replacement or a different design since the DFM is not active.

 

haider320 Enthusiast

haider320

Posted
Posted

Build date 10/21 and no DFM.  I only have 1100 miles on the truck though.  So far so good.  Fingers crossed...   

  • Like 1
Byrds8 Enthusiast

Byrds8

Posted
Posted

Build date 7.21, no DFM and 2500 miles. So far so good. Hope like hell it doesnt break. Sad this is something that has to be a concern.

newdude Senior Enthusiast

newdude

Posted
Posted (edited)
On 12/31/2021 at 1:07 PM, Nutmeg said:

Was interested if any of the trucks shipped without DFM have had any lifter failures? Understand they have all the same mechanical parts so am concerned as I have a 2021 Sierra with a May build date. Outside the known date but since the hours were high compared to the miles thinking it may have been one that was idle tested.

 

 

Have yet to see any with failure.  

 

 

On 1/1/2022 at 1:29 AM, Supreme Pizza said:

 

 

Yes.

 

 

 

 

Got any examples of lifter failure of a factory DFM disabled truck?  We've sold a bunch, some over 10K on them, no failures.  

 

 

On 1/1/2022 at 2:58 PM, Nutmeg said:

Well that kills a couple of the theories. Do you know if they are using the standard DFM lifters as replacement or a different design since the DFM is not active.

 

 

No.  Same mechanicals.  ECM is missing the parts to operate DFM.  

Edited by newdude
  • Like 1
Nutmeg Enthusiast

Nutmeg

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Posted

Good to hear some positive news. Have 2k on mine and want to see a whole lot more. Have a oil pressure question. My 5.3 no DFM from factory, has 90 lbs oil pressure on a cold start, normally runs down the road just below 60, and drops to 30 or a hair under at idle. Is this what others have seen on theirs? 

  • Like 1
lebag335 Enthusiast

lebag335

Posted
Posted
9 hours ago, Nutmeg said:

Good to hear some positive news. Have 2k on mine and want to see a whole lot more. Have a oil pressure question. My 5.3 no DFM from factory, has 90 lbs oil pressure on a cold start, normally runs down the road just below 60, and drops to 30 or a hair under at idle. Is this what others have seen on theirs? 

Yes

Steve-2019 Enthusiast

Steve-2019

Posted
Posted
13 hours ago, Nutmeg said:

Good to hear some positive news. Have 2k on mine and want to see a whole lot more. Have a oil pressure question. My 5.3 no DFM from factory, has 90 lbs oil pressure on a cold start, normally runs down the road just below 60, and drops to 30 or a hair under at idle. Is this what others have seen on theirs? 

 

Normal

Stifler Enthusiast

Stifler

Posted
Posted

OK I will be the dummy... there are 21s with no DFM? or are you talking disabled with a tuner? How do you know if you have or dont have DFM?

WeGone Enthusiast

WeGone

Posted
Posted (edited)

You can check the RPO codes, I also read its on the window sticker as a $50 credit.  Check some of the older posts about it they list what to look for.

 

Try this for starters.

 

 

Edited by WeGone

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