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2017 5.3L/8 speed lugging at throttle tip in

SGS_Z71

By SGS_Z71
in Troubleshooting & Recalls

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BamCam Enthusiast

BamCam

Posted
Posted
11 hours ago, Bash74 said:

So is this a 2017 problem or a 8 speed trans problem. Also if it is a tune issue because of mpg, why is it messing up in cold weather.

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As stated above, the issue is present on the '17s and '18s on the dealer lot.  So based on our experience and what they are telling us, I cannot say with any certainty it is MY and/or Trans dependent.  The cold weather just makes the problem that much worse.  It is still there in 50, 60, 70 degree weather.  It does seem to be less as the ambient temperatures rise but this will need further validation when weather warms.  He bought the truck last May and over the summer it was there but he seemed to think it was normal until 30s & 40s came and then it was obviously an issue.  We feel it is programming just based on the fact that during the test drive when the tech made one slight adjustment (not sure exactly what) the truck fell flat on it's face and he quickly reset to previous.  We know the tech personally and we asked if he could make it stall can he make it better.  Of course, his response was..."um no...not legally".:)  Which is completely understandable and was really just us ribbing him.  Since getting the truck back my brother has been using M6 or M7 and issue is less frequent so maybe AFM related?  I too have stopped driving my '17 Colorado in D on most occasions and strictly use M5 or M6 unless on highway.

 

I have learned, that during the last day the truck was in the shop, two gentlemen from GM were present and they were downloading and taking screenshots of the ECM/TCM data.  Service manager and Tech said some screens looked like the Matrix (binary code).  GM cleared the truck as mechanically sound and said go ahead and return to customer.  The GM rep present also had no issue offering my brother the max extended powertrain warranty but it has to go thru corporate.  He is still waiting to hear what that coverage will be.  It is nice to know, at least in my brother's case, GM is trying to do something and collecting as much data as possible.  Will this lead to a "fix" who knows but I highly recommend anyone with similar issue have the dealer/GM look at it.  The more samples they get the better it would be for all of us.

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Bigmac Enthusiast

Bigmac

Posted
Posted

Just ran across this. I have a 17 6.2 8 speed max tow. . Has the shudder as I would call it from 2nd gear on up at 1500- 2000 rpms only on load. Pop into neutral or let off gas and it disappears.  Have had 3 converters  and 1 new trans and problem still continues.  Becomes very bad when towing. Definitely feel imo that it is converter lock up.  Waiting to have field engineer check but from reading this I might be sol. To bad as truck is great 

Bash74 Enthusiast

Bash74

Posted
Posted
As stated above, the issue is present on the '17s and '18s on the dealer lot.  So based on our experience and what they are telling us, I cannot say with any certainty it is MY and/or Trans dependent.  The cold weather just makes the problem that much worse.  It is still there in 50, 60, 70 degree weather.  It does seem to be less as the ambient temperatures rise but this will need further validation when weather warms.  He bought the truck last May and over the summer it was there but he seemed to think it was normal until 30s & 40s came and then it was obviously an issue.  We feel it is programming just based on the fact that during the test drive when the tech made one slight adjustment (not sure exactly what) the truck fell flat on it's face and he quickly reset to previous.  We know the tech personally and we asked if he could make it stall can he make it better.  Of course, his response was..."um no...not legally".[emoji4]  Which is completely understandable and was really just us ribbing him.  Since getting the truck back my brother has been using M6 or M7 and issue is less frequent so maybe AFM related?  I too have stopped driving my '17 Colorado in D on most occasions and strictly use M5 or M6 unless on highway.
 
I have learned, that during the last day the truck was in the shop, two gentlemen from GM were present and they were downloading and taking screenshots of the ECM/TCM data.  Service manager and Tech said some screens looked like the Matrix (binary code).  GM cleared the truck as mechanically sound and said go ahead and return to customer.  The GM rep present also had no issue offering my brother the max extended powertrain warranty but it has to go thru corporate.  He is still waiting to hear what that coverage will be.  It is nice to know, at least in my brother's case, GM is trying to do something and collecting as much data as possible.  Will this lead to a "fix" who knows but I highly recommend anyone with similar issue have the dealer/GM look at it.  The more samples they get the better it would be for all of us.
So if his comment was really "no not legally" then him and gm knows the fix and it is all tuning. This basically means it will never be fixed because they can't, because of epa and mpg and the mechanical workings of the engine and trans together.

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SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted

I’m very confident this is tuning issue.  The people with full out shudder/Chevy shake, that is mechanical and needs addressed.  I have mine back from the tsb service to flush everything and it seems better.  I am not lugging at the low speeds anymore.  I haven’t had much low traffic driving to test the 55-70 mph stuffer, but will the week after next when I drive to/from Tennessee.  For me that is going to be the point where I make my decision on the truck.  

 

- I’ve learned the dealers trans tech tunes on the side, might be interesting what he can come up with.

- I am not in favor of trading off for a Ford as my payment will go up quite a bit, and I like the simplicity of a tried and true pushrod V8.  Eco boost and coyotes are great engines, but far from simple.

 

My guess is this is all AFM and the pulse width modulated tcc lock up.  If that’s the case, we will get nowhere with GM as it ties to EPA ratings.

 

It will be interesting for the 2019 to see if they keep the 6 speed and ditch the 8 speed when they bring in the 10 speed.  Or ditch the 6 and keep the 8..... Oh, and the 2019 has a whole new AFM system that drops 1-7 cylinders versus just 4 or 0.  Good luck with that.  Plus the truck is ugly!!

  • 2 weeks later...
SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted

Well, update....I just made a trip to Tennessee and it chugged up every single hill on i75. I’d say it has gotten worse.  I made this trip many times in my 2014 6 speed, and no chugging.  Back to the dealer I go.  I will be contacting GM as well.  If I knew with 100% confidence what it was, and that tuning would fix, I’d probably shut up.  What was weird today, I disabled AFM by shifting to L7 and it still did it.  They keep telling me it is AFM.  I don’t buy it.  

Ray Davis New Member

Ray Davis

Posted
Posted

I have a similar issue with my 17 Denali.  I also have an issue of where the truck hesitates when I'm attempting to pull out of a parking or side street..  But, regarding the lugging or clunkiness, I was thinking it was backlash in a sloppy ring and pinion.  I am interested in reading others experiences, so I know what to expect when I take it in. 

13891 Enthusiast

13891

Posted
Posted
4 hours ago, SGS_Z71 said:

Well, update....I just made a trip to Tennessee and it chugged up every single hill on i75. I’d say it has gotten worse.  I made this trip many times in my 2014 6 speed, and no chugging.  Back to the dealer I go.  I will be contacting GM as well.  If I knew with 100% confidence what it was, and that tuning would fix, I’d probably shut up.  What was weird today, I disabled AFM by shifting to L7 and it still did it.  They keep telling me it is AFM.  I don’t buy it.  

Had mine at a second dealer last week.  After 2 days of back and forth with GM the technician was told by their technical assistance reps to stop banging their head against the wall as there is no “fix” for this.  It is the 5.3 and 8 speed combination that is causing it.  Something about the 2 components operating in just the right ranges to cause this what’s they call “snake bite” condition.

The rep told he technician he has 6 other cases documented as doing the exact same thing.

I now have the truck back “snake bite” and all.  I also was told to go to M6 which should help the condition.  It does help but I can still feel it if I pay close attention.  Certainly not as severe but it is still there.

I say keep pounding on them if we want it fixed.  The squeaky wheel gets the grease, sometimes....

BamCam Enthusiast

BamCam

Posted
Posted

My brother's truck is still exhibiting this and getting worse.  He has not received any updates from GM if/when the fix will be.  I rode with him this past weekend and I am shocked GM allowed his truck to be returned to him.  In our opinion, it is a safety issue.  His is so bad at times the truck almost comes to a stop on an incline.  It feels like a car with a clogged catalytic converter.  Because of this, GM not being responsive & GM customer care's recommendation, he has started the lemon law proceedings.  For his sake I really hope it gets done, he and his family are extremely upset with the whole experience and just want the truck gone.  Sad that he traded a great running '06 Silverado in on a 57k truck that runs like garbage.

Sir Dan Enthusiast

Sir Dan

Posted
Posted
11 hours ago, 13891 said:

Had mine at a second dealer last week.  After 2 days of back and forth with GM the technician was told by their technical assistance reps to stop banging their head against the wall as there is no “fix” for this.  It is the 5.3 and 8 speed combination that is causing it.  Something about the 2 components operating in just the right ranges to cause this what’s they call “snake bite” condition.

The rep told he technician he has 6 other cases documented as doing the exact same thing.

I now have the truck back “snake bite” and all.  I also was told to go to M6 which should help the condition.  It does help but I can still feel it if I pay close attention.  Certainly not as severe but it is still there.

I say keep pounding on them if we want it fixed.  The squeaky wheel gets the grease, sometimes....

They called it "fish bite" but I like snakebite better since it's how I feel about buying this truck.

13891 Enthusiast

13891

Posted
Posted
3 hours ago, Sir Dan said:

They called it "fish bite" but I like snakebite better since it's how I feel about buying this truck.

LOL you're correct, fish bite not snake bite. 

FourThor Enthusiast

FourThor

Posted
Posted

Is the consensus really that this is software? Anyone here able to tune this issue out of their truck? Rather than take my 18 into the dealer yet again to be told that this issue is common and GM is waiting to make a statement I'd rather just get it fixed myself if a tune works.

SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted
6 hours ago, 13891 said:

LOL you're correct, fish bite not snake bite. 

 

First time this situation has made me laugh... thank you guys!

SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted
2 hours ago, FourThor said:

Is the consensus really that this is software? Anyone here able to tune this issue out of their truck? Rather than take my 18 into the dealer yet again to be told that this issue is common and GM is waiting to make a statement I'd rather just get it fixed myself if a tune works.

This is my exact question I am looking for input on.  If tune takes care of it, I’m good, still cheaper than trading in.  

SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted
11 hours ago, BamCam said:

My brother's truck is still exhibiting this and getting worse.  He has not received any updates from GM if/when the fix will be.  I rode with him this past weekend and I am shocked GM allowed his truck to be returned to him.  In our opinion, it is a safety issue.  His is so bad at times the truck almost comes to a stop on an incline.  It feels like a car with a clogged catalytic converter.  Because of this, GM not being responsive & GM customer care's recommendation, he has started the lemon law proceedings.  For his sake I really hope it gets done, he and his family are extremely upset with the whole experience and just want the truck gone.  Sad that he traded a great running '06 Silverado in on a 57k truck that runs like garbage.

I cannot believe they let a vehicle go back to the customer, I would not drive it.  Lemon law all the way.  I think you can even recover rental fees.

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