2024 Throttle pedal dead take off delay / 6.6 Duramax 2500HD

[JA-Fab]

Hi guys, I have 2024 GMC 2500 Sierra with the 6.6L Duramax. 

 

My issue is this,

From a DEAD STOP when you try and punch the throttle to get out into traffic, it does not react instantly at all!

What it does is creep aprox 1 to 2 MPH for 2 to 2.5 seconds, then it will speed up to where ever the throttle pedal position is at that time.  Its VERY DELAYED, and is actually dangerous.  (it has done this since day one (6/1/23) and now i have 4,200 miles on it, and im told there is not a "governed/limited break in period" either when it would restrict that)

 

I've brought it in to the dealership (8/14/23) to see if was "normal" for the 2024's, and as expected, they said yes it seems like other 2024's. 

 

I know of someone who has the Chevy version of my truck (with the 6.6L Duramax) BUT his is a 2023 (not a 2024) and his does NOT have that delay at all. 

I also know of a person with a 2020, and his also does NOT have this issue. (so i think its a 2024 issue/change)

Im sure GM programmed them this way in 2024 (part of the software program, and there is not a motor or transmission issue at all)

 

I called OnStar 8/14/23 and had them pass me over to the GM "Issue" department and let them know what i was up against, and how it is potentially dangerous and may even be life threatening  (in my honest opinion). But at least there is a note at my dealer, and direct to GM (through OnStar) too.

 

I was looking to see is anyone has a 2023 or 2024 6.6L Duramax that is experiencing my same issue of a throttle delay from a DEAD STOP take off when your throttle is at mid or full throttle?? 

Please chime in with your feedback please, so we can hopefully speak up to get a software update to resolve this issue. 

 

I did try a Banks Pedal monster on my 2024, but it did NOT do anything for the dead stop takeoff delay at all! (feedback on that too please, good or bad), but it did solve the already cruising speed acceleration responsiveness, and was a BIG difference in that department! 

(i will say that i called Banks on the "reverse over ride to stock" function, because it would not recognize my truck to activate the reverse override function. They said there was a change GM made to the programing for 2024 trucks, and Banks is working on an update that they will send out once they figure it out. So i was thinking maaaaaaybe the same thing is going on for the "instant take off" function, where as Banks could improve that for me/us as well)  

 

  

Edited August 15, 2023 by JA-Fab

[Jsdirt]

2024 ... yikes. Good luck with that! Too many electronics, too much emission crap. Could literally be any one of 10,000 individual things, or systems, or modules on that thing. 

 

That's the dealer's problem. If they can't fix it, make them get you another one. And if they ALL do this, then get out from under it, flip GM the bird, and buy something else from another brand.

 

On a 6-figure $$$ truck, that problem is UNACCEPTABLE.  Full stop!

[Campingfamco]

I've been trying to figure this out too.  I was really hopeful after 4k miles it would let it be free, but from what you're saying that is not the case.  I almost got into an accident yesterday because I was expecting the truck to move faster than it did, I ended up flooring it and the acceleration response didn't change, then over 15 mph whatever torque management is on the truck let everything go and I spun the tires.  Now I know you have to drive it like a semi from a stop.  

 

My guess is they programmed torque management to save the transmission.  They just over did it. 

[JA-Fab]

I agree, i know its in programming, and think they OVER programmed it, and it is definitely SOOOO DANGEROUS! 

 

I hope a GM guy can see this issue, because the dealer has no clue, and shrugs their shoulders at it.   

[newdude]

Torque Management. 

 

Best thing I've found on these L5Ps over the years is to gradually push into the pedal.  If you right away snap it to mid or beyond it will hold the truck back to build up the power safely.  

 

Can't drive them like an old carbureted truck.    

 

Edited August 18, 2023 by newdude

[Jsdirt]

Makes me glad I took my '07 off the road and went to a 1993 diesel. The hell with that crap!

 

My '07 does that a little bit, too - usually when you need the punch the most!

 

NO vehicle should jeopardize your safety because a manufacturer is too cheap to built parts that can handle the engine THEY designed! Especially when you're paying $100-LARGE PLUS for a friggin truck!

Edited August 18, 2023 by Jsdirt

[Silverado4x4]

On 8/18/2023 at 10:17 AM, Campingfamco said:

I've been trying to figure this out too.  I was really hopeful after 4k miles it would let it be free, but from what you're saying that is not the case.  I almost got into an accident yesterday because I was expecting the truck to move faster than it did, I ended up flooring it and the acceleration response didn't change, then over 15 mph whatever torque management is on the truck let everything go and I spun the tires.  Now I know you have to drive it like a semi from a stop.  

 

My guess is they programmed torque management to save the transmission.  They just over did it. 

When I had my 2004.5 LLY Duramax if I knew I had to pullout quickly I would hold the brake and give it about 1/4 throttle maybe a little more to let it build boost then when the time came let go of the brake and nail the throttle, made a world of difference.

[Jsdirt]

There's got to be a way to tune this out. If not, maybe a year down the road there will be. 

[JA-Fab]

I agree, i just want it to be an OEM fix/update.  (while its under warranty)  

[JA-Fab]

On 8/18/2023 at 10:17 AM, Campingfamco said:

I've been trying to figure this out too.  I was really hopeful after 4k miles it would let it be free, but from what you're saying that is not the case.  I almost got into an accident yesterday because I was expecting the truck to move faster than it did, I ended up flooring it and the acceleration response didn't change, then over 15 mph whatever torque management is on the truck let everything go and I spun the tires.  Now I know you have to drive it like a semi from a stop.  

 

My guess is they programmed torque management to save the transmission.  They just over did it. 

We need more people to go to the dealer and express their concern about how dangerous this potentially can be!

The more complaints their data base shows, then they are more apt to see there is a bigger issue and not some lonely guy from southern Maine that "thinks" there is an issue.  There clearly IS AN ISSUE

 

I even called On-Star, and told them (they have a quality department) my issue/concern  

[newdude]

19 minutes ago, JA-Fab said:

I agree, i just want it to be an OEM fix/update.  (while its under warranty)  

 

 

There won't be.  Its working as intended.  They've done this since LML days.  

 

Don't mash the pedal from a stop.  Roll it fairly quickly.  

 

The new big bad Powerstroke with 1200ft.lbs does this too.  

Edited September 19, 2023 by newdude

[Jsdirt]

That is just absolutely F'ing ridiculous on a vehicle they sell for 6-figures. No such lag in my 12v!

 

Might not have the same power output, but that can be fixed with money.

[JA-Fab]

On 9/19/2023 at 9:33 AM, newdude said:

 

 

There won't be.  Its working as intended.  They've done this since LML days.  

 

Don't mash the pedal from a stop.  Roll it fairly quickly.  

 

The new big bad Powerstroke with 1200ft.lbs does this too.  

I have had people with 2023 & 2022's, see how mine is, and said theirs is NOT like that. (but i have not been in them trucks or driven it myself. 

(maybe if there are any 2022 & 2023 2500hd Durmax guys on here, they can chime in too) 

[newdude]

6 minutes ago, JA-Fab said:

I have had people with 2023 & 2022's, see how mine is, and said theirs is NOT like that. (but i have not been in them trucks or driven it myself. 

(maybe if there are any 2022 & 2023 2500hd Durmax guys on here, they can chime in too) 

 

 

Idk man.  Just took a 2024 down to fill the tank, seems no different than the 2020-2023 trucks.  If you briskly roll into the pedal it puts you to the seat from a dig.  If you slam it through the floor board, nobody is home until the torque management lets you get the power.  

 

Got to protect that driveline for 5yr/100k miles of warranty.  

Edited September 21, 2023 by newdude

[BC100]

I have a 2024 AT4 with the 6.6 diesel. Same problem. Throttle delay sucks when trying to get out in traffic. DANGEROUS. $90k+ and this is the performance you get???? May just get rid of it and not look back. Buddies new Ram blows my GMC away.

[Jsdirt]

No amount of explaining this system would make me accept it either for what these trucks sell for. It's downright criminal.

 

My grandparents would've drove the truck right through the glass at corporate headquarters, and told them to stick it up there asses! It's unreal what this generation of people puts up with. GM and the rest must just laugh! Everyone is getting screwed BLIND.