Clunk when accelerating / Decelerating - 8 speed Denali 6.2 CC
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Hasn't come up in the 3 gm forums I follow. And only gm knows the frequency of failure of that part. LMG, you want a recall so it's replaced for free... -
You need a better code reader/scanner. You are missing codes. Did the dealer give you a copy of the SAVI scan from that visit? If the fluid hasn't been changed, change it. Shudder will likely go away. -
TLDR to my other post... Hard. Pass. Too many what ifs. Are you set on a 3.0 Duramax? Have you considered anything not GM just in case? If you don't have to have a pickup, lots of other options for $27,000 out there.
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I see some red flags. - No mention in the Carfax if the oil pump belt was changed. LM2s had a 150,000mi service interval, and its got 164,245mi on it. So right out the gate it needs about $3000-3500 for that to be done before driving it another 150,000mi. Belt is at the rear of the engine. - If something happens to the transmission valve body, the special coverage is expired by mileage. That will likely be an out of pocket expense, with zero or near zero GM participation if something happened even though its in by time. - 2020 LM2s seem to need timing chains after 80,000mi at some point. They fixed this end of 2020/starting 2021 model year engines. They will usually set a P0016 I think? There is another $8000-10,000 if it needs a chain. The main chain is at the back, secondary at the front so the pump belt would be done at the same time if it needed chains. - Long oil change intervals. 7,000-8,000mi on average, probably close to 0% or perhaps to or beyond 0% on the OLM. Lots of them not at the dealer which makes me wonder how much of the oil ran through that truck was the proper Dexos D rated 0w20 oil and not just gas engine 0w20, which is not the same at all. - Long fuel filter changes, again likely taking the fuel filter life to 0% or more. First one went 28,603, second was done 43,094 miles later at 71,697, from there another 46,452mi to 118,149mi, and then the most recent one 37,026mi later at 155,175mi. So counting its original fuel filter, its had only 4 fuel filters on it. No bueno IMO. Good news? - It has had only two warranty trips to the dealer. The first free service (end of December 2020 on the Carfax), and the transmission reprogram recall (end of August 2025 on the Carfax). - Truck did a LOT of moving, so that might explain the lack of emissions related repairs like bad NOX sensors, bad exhaust temp sensors, bad glow plugs, etc. The "emissions system checked" could just be how something was flagged for Carfax. GM dealers have to do SAVI reports for warranty repair orders so they scan the truck. So its possible that is there for that?
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