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ajs800

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  • Location
    MI
  • Gender
    Male
  • Drives
    2020 Sierra AT4  5.3/10spd

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  1. I hear conflicting info on this. I would purposely drive in L9 to see if it improved some of the shuttering/lugging and at times it seems improved but other times I notice no difference. According the mechanic at my local GM dealer, L9 does not do away with the DFM 100% like previous models but I've read otherwise.
  2. I hear conflicting info on this. I would purposely drive in L9 to see if it improved some of the shuttering/lugging and at times it seems improved but other times I notice no difference. According the mechanic at my local GM dealer, L9 does not do away with the DFM 100% but I've read otherwise.
  3. Tightened the UBC bolts thinking it took care of my issue only to find out a month later it was a bad starter. Dealer told me they've replaced a lot of starters on these trucks.
  4. looks good! Is it possible to show full truck side view? I'm considering the same size with my stock AT4.
  5. I had a "no start" similar to a dead battery off and on for the last 2wks so I stopped to chat with my dealer and they checked it out and said my starter is bad and ordered new one. After reading this info regarding the fuse block I went ahead and tightened all four as they did seem loose. fingers crossed but I'm now on day 3 with no issues...hard to believe this might be the answer as my dealer orders useless parts. They didn't seem to be aware of the fuse block TSB.
  6. what engine tranny combo do you have? I'm considering purchasing the pulsarLT as well but when I run mine in "L9" it still misses/bucks/shutters when lightly accelerating at cruising speeds so in my case, not so sure it's the DFM.
  7. I was hoping my shutter/misfire feel was related to the DFM (as my dealer states) as I'd give the Pulsar a try but unfortunately it is not the DFM. I've been running it in L9, L8 and i still get the shutter/misfire feeling when slightly accelerating while at cruising speeds. 50mph, 60mph, 70mph, etc. once i step into it to downshift it clears up but while cruising with slight load, it's the farthest thing from smooth with a shutter/jerky/lugging type feel while increasing speed. I'm starting to think it's tranny related or engine (while under load).
  8. My '20 AT4 was perfect for the first 12mos and 14k miles...now dealing with tranny (10spd) related issues as well as brake related issues that keep triggering the engine light along with two other unknown engine light moments (according to dealer issue was not stored in computer). Multiple software updates, new torque converter and the tranny still isn't right.
  9. Have you noticed the issue when putting in L9? .my dealer mentioned the same and even my paperwork states that the DFM is to blame but was tested and operating as it should. However, when putting the tranny in L9 it supposedly shuts off the DFM and when doing so mine still exhibits the same problem so it's not the DFM in my case as they state.
  10. Thanks for the update. It sounds like my exact situation. Dealer told me after several test drives that something is not right only to be told a week later after doing multiple things that it's not any better but is now consider "normal". They didn't have much to say when I told them that it didn't do it for the first 14k miles of ownership so how can it be normal? Yes, I'm considering selling mine as well. It sucks as I like the truck but no way am I going to keep something that doesn't operate correctly with only 20k miles.
  11. Which engine/ tranny combo do you have? I am at 19k miles now and have had my 20 AT4 (5.3/10spd) to the dealer three times now with no fix. They have replaced the torque converter(it actually tested out of spec) as it seemed like the likely culprit given the issue, fluid flush, and multiple software updates with no change. They now claim it's normal which is total BS. It was 100% smooth the first 14k miles. Now it from around 40+ any slight "tap in" to the throttle without it downshifting creates a bucking, tranny lug, misfire type feel...kind of similar to an out balance rear wheel feeling. The dealer thought it might be wheels out of balance as well until we did a test drive on a smooth road and coasted in N and it was silky smooth. They eve road forced them again thinking it was maybe the issue but no luck. I also thought about disabling the AFM but the issue is still there when putting tranny in L9 so that excludes the AFM. I'll probably take it to another dealer, although I really don't want to deal not having the truck for another 7-10days. It will be tough given the current market, but I plan to dump the truck as soon as I can find a reasonable deal on something. It blows me away how GM treats their customers and respond with it's considered "normal" crap. I would love to find a fix but starting to lose hope at this point.
  12. Anyone have anything further on this issue? My 2020 AT4 (5.3) has been doing the same for last 5k miles or so. It just turned 17k miles and my dealer did a fluid change with no change. Definitely feels like a torque converter issue or tranny slipping when lightly accelerating (light load). Truck vibrates, jumps, bucks, chugging feeling, etc. Does it in all gears,including L9, and is really noticeable at speeds 45mph - hwy speeds. Only way to avoid is it to stay heavy on pedal.
  13. I am approaching 15k miles on my '20 Sierra AT4 and over the last few thousand miles have noticed a slipping type feel while under load. It may not be tranny related and more torque converter but between 60-75mph under soft load it tends to jump and has a pretty noticeable slipping feel. I know the 10spd is known to be solid (thus far) but any other common driveline issues with these trucks? I never seem to have luck leaving it in dealers hands without guidance but I might be forced to at this point as I am not finding any common or well known problems when researching.
  14. I am approaching 15k miles on my '20 Sierra AT4 and over the last few thousand miles have noticed a slipping type feel while under load. It may not be tranny related and more torque converter but between 60-75mph under soft load it tends to jump and has a pretty noticeable slipping feel. I know the 10spd is known to be solid (thus far) but any other common driveline issues with these trucks? I never seem to have luck leaving it in dealers hands without guidance but I might be forced to at this point as I am not finding any common or well known problems when researching.
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