2019 Sierra 6.2L AT4 died, dealership has no clue!

clowe1243 · July 29, 2022

Completely sounds like the dfm lifter failure that is still in a class action lawsuit. Curious if you disabled it ever? Knocking on wood that I disabled it early enough to prevent the lifter failure; fingers crossed someone comes out with a hardware delete at some point.

sheamus · July 30, 2022

No I have never disabled DFM, I didn't know you could. With the cost of fuel up here I never considred it. But yeah it does seem like that is the issue. Which is brutal that it took them this long to figure it out then if it is a known issues.

GMC Canada is still "reviewing my case". I suspect they are slow playing me until the truck is fixed, and then think I will back off once I have vehicle back. It's going to be a fight I guess. It is good to know your friends experience, sou

The updated loaner they gave me the other day is a 2021 Canyon AT4. I have only driven it a day, and I like it. 90% of the time I dont truly _need_ a full-size. But it feels like half the truck, half the power, with about 10% fuel savings.

Edited July 30, 2022 by sheamus

sheamus · August 19, 2022

It will be 2 months this Monday and still no truck. GMC canada has been friendly on the phone, and have told me 4 times now that a supervisor would be phoning me within 24 hours. I have nnot received a single phone call from them. Probably time that I stop being nice about it.

sheamus · August 23, 2022

Finally spoke to someone at GMC Canda yesterday. They said they are still reviewing the case. They said it is highly unlikely they was do any sort of replacement including motor. They said things that may come out of the review are extending warranty, covering payments for the 2 months of not having a vehicle, and also a "trade-assist". It was nice to finally have a dialogue about things. I would consider the trade-assist, but I am getting close to having my truck paid off, and I was really looking forward to not having a payment... unless I go down a few trim levels, it is hard to imagine that even with the trade-assist, I don't end up extending my payments. I really like the AT4 w/ 6.2L so I am not sure I want to go down a trim. So most likely looking at extended warranty I guess. They said they would phone me once review was complete and present me with options.

Dealer is still waiting on parts.

SporkLover · August 26, 2022

On 7/29/2022 at 1:44 PM, clowe1243 said:

Completely sounds like the dfm lifter failure that is still in a class action lawsuit. Curious if you disabled it ever? Knocking on wood that I disabled it early enough to prevent the lifter failure; fingers crossed someone comes out with a hardware delete at some point.

Lifter failure is different than throwing a rod. Also there is already a delete kit out there. https://www.amsracing.net/collections/gm-afm-dod-kits/products/active-fuel-management-afm-dod-delete-kit-for-2014-current-gm-chevrolet-gen-v-l86-6-2l-engines or https://www.amsracing.net/collections/gm-afm-dod-kits/products/active-fuel-management-afm-dod-delete-kit-w-stock-cam-for-2019-gm-chevrolet-gen-v-l84-5-3l-engines