Jump to content

Option Code YK9 - DFM Credit

AlDAngle
 Share

Recommended Posts

AlDAngle Enthusiast

AlDAngle

Posted
Posted

I'm looking at a 2022 1500 that's allegedly "built and on the way".

 

It's equipped with: "L84-Engine: 5.3L, EcoTec3 V-8, DI, Dynamic Fuel Mgt, V V T"

 

The build sheet shows Option Code "YK9-CREDIT - NOT EQUIPPED WITH DYNAMIC FUEL MANAGEMENT"

 

Is this deletion a chip shortage issue, or is Chevy deleting the Dynamic Fuel Management due to engine/lifter issues?

 

Thanks

 

 

ESierra Enthusiast

ESierra

Posted
Posted

I recall its due to the chip shortage. And it's one of those where it's welcomed to be not equipped with 🤣

  • Like 1
newdude Senior Enthusiast

newdude

Posted
Posted

Correct.  YK9 is not equipped with DOD.  Hardware is still in the engine, ECM is missing the ability to run it.  It is not an item that will be retrofitted either so its always off.  

AlDAngle Enthusiast

AlDAngle

Posted
  • Author
Posted
20 minutes ago, newdude said:

Correct.  YK9 is not equipped with DOD.  Hardware is still in the engine, ECM is missing the ability to run it.  It is not an item that will be retrofitted either so its always off.  

 

With the hardware still present in the engine, what is the reasoning behind the YK9 modification? Is it being done to reduce the chances of engine issues believed to be tied to DFM?

newdude Senior Enthusiast

newdude

Posted
Posted
4 minutes ago, AlDAngle said:

 

With the hardware still present in the engine, what is the reasoning behind the YK9 modification? Is it being done to reduce the chances of engine issues believed to be tied to DFM?

 

 

Its possible, but GM's line was for semiconductor allocation.  Delete DFM to re-allocate those for other vehicles. 

Z45 Senior Enthusiast

Z45

Posted
Posted

According to GM:

    Internal components related to AFM or DFM function will be present in engines; wiring, connectors, and fuses will be present in vehicles with RPO YK9. The ECM will not be capable of activating the cylinder deactivation technology.

    When diagnosing and repairing concerns with base engine or electrical function which may be related to AFM or DFM related hardware; utilize appropriate diagnostics within SI and replace any needed components as directed by the Electronic Parts Catalog; no changes will occur to AFM or DFM related components.

    Important: Any truck designated with RPO YK9 CANNOT be reprogrammed and changed to “Turn on” the AFM/DFM functionality.

dieselfan1 Senior Enthusiast

dieselfan1

Posted
Posted
53 minutes ago, elcamino said:

According to GM:

 

    Internal components related to AFM or DFM function will be present in engines; wiring, connectors, and fuses will be present in vehicles with RPO YK9. The ECM will not be capable of activating the cylinder deactivation technology.

 

    When diagnosing and repairing concerns with base engine or electrical function which may be related to AFM or DFM related hardware; utilize appropriate diagnostics within SI and replace any needed components as directed by the Electronic Parts Catalog; no changes will occur to AFM or DFM related components.

 

    Important: Any truck designated with RPO YK9 CANNOT be reprogrammed and changed to “Turn on” the AFM/DFM functionality.

 

It can still grenade like all the rest of them.

AlDAngle Enthusiast

AlDAngle

Posted
  • Author
Posted (edited)

IMHO, I find it hard to believe that Chevy would turn off an engine's DFM to reallocate its chip. Especially because no DFM equals less MPG, and GM is very concerned with CAFE Standards.

 

On the other hand, the cam, lifters, and other DFM (DOD) specific parts are still present in the engine. If there is a reliability issue with these parts, will disabling DFM lessen failures?

Edited by AlDAngle
TxSilver Enthusiast

TxSilver

Posted
Posted

Just bought a new Silverado last week. How do I know if it has DFM? Sticker did not mention any credit for DFM, so safe to assume it has it?

AlDAngle Enthusiast

AlDAngle

Posted
  • Author
Posted
1 hour ago, TxSilver said:

Just bought a new Silverado last week. How do I know if it has DFM? Sticker did not mention any credit for DFM, so safe to assume it has it?

Here is a snip from a sticker with the YK9 option on Build Sheet:

 

 

No_DFM.GIF

TxSilver Enthusiast

TxSilver

Posted
Posted
1 hour ago, AlDAngle said:

Here is a snip from a sticker with the YK9 option on Build Sheet:

 

 

No_DFM.GIF

Thanks. Looks like my truck does have DFM enabled.

  • 1 year later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • KARNUT
      Gas Prices

      By KARNUT · Posted

      3.59 Kroger’s in Montgomery Tx. 20 cents higher than most around here. Very unusual. Saturday they were 3.49. 
    • KARNUT
      Travel Trailer 2024 2500 HD 6.6 Gas Engine ?

      By KARNUT · Posted

      Starting at 17 running parts for my father’s construction business to haul our equipment. Eventually doing shows, sales and training after purchase. I drove a minimum of 50K miles a year. Half hauling something. After retiring 30K miles a year to the last 2 years 15K miles a year. 2/3rds highway driving. The major contribution to fatigue for me is from anticipation and awareness. I just don’t relax. Too many idiots on the road. There’s two kinds. The group that never leave the left lane tied together afraid to let anyone in doing 80. They’re mostly on weekends. Then the left lane sleepers usually next to a tractor trailer not advancing. Eventually the tractor trailer will drift over the sleeper will wake up. The train moves and the tailgaters who are usually mad as hell. You definitely don’t want to mix with them. The tail wagging bumper puller’s with under powered trucks are holding the tractor trailer up. That bunch are dangerous. I usually pace ahead all that. Unless there’s a gap when I can chill and let the speeders pass. I tried all different types of driving. I stay to the right except to pass, it’s the law that’s getting in forced more now because of road rage. I was so happy when my wife didn’t want to do the camping life. I had enough of pulling for work. The family has a bus and fifth wheel. I haven’t driven either one since retiring. No thanks. 
    • Chuck FB
      Travel Trailer 2024 2500 HD 6.6 Gas Engine ?

      By Chuck FB · Posted

      Yesterday a suggested youtube video thumbnail caught my attention so I watched through it and it was a bunch of short clips someone gathered together of people pulling trailers, a lot of them were bumper pull holiday trailers and a pickup or suv pulling it. a few fifth wheels as well, some motorhome crashes also. The tail wagging the dog theme was quite evident in numerous self inflicted accidents that took out vehicles around them sometimes in the process as the unit finally swung around and flipped over in the middle of the highway. Or the other classic which literally could be called "I forgot the trailer was back there" in passing another vehicle on a multi lane one way freeway and then cutting back in line before the back of the rv trailer had passed the front of the passed vehicle and often in front of a tractor trailer and that never ended well. Or the wide kick out swing of the rear of a long travel trailer as they have so much overhang behind the axles and the trailer smashes into the side of vehicles in the next lane over ( typically sharp turns in city driving ). It makes one leery for good reason to be near an RV trailer after watching a video like that and be it on the highway, in town, or at a gas station where that rear end comes swinging around due to the fuel station being so cramped and not intended for larger trailers. I wonder how many officers have heard those words though "I forgot it was back there" as they investigate the accident LOL. 
    • Atlas
      Gas Prices

      By Atlas · Posted

      $5.10 for regular at the Kroger   It's been 6 months... is this the "new normal" ?
    • diyer2
      Travel Trailer 2024 2500 HD 6.6 Gas Engine ?

      By diyer2 · Posted

      Just because a person can buy a travel trailer or a motorhome doesn't mean they can drive it properly. My observation during my RVing years. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...