3.0 Duramax exhaust smell in cab

[poppy510]

Well I may have found the source of the exhaust smell. No leaks that I could detect at any of the pipe joints, but found a significant leak from the turbocharger vane actuator shaft.

 

 

 

I then found this Service Bulletin No.: 22-NA-168:

 

 

 

However, it clearly states

Any thoughts? Seems Like a lot of exhaust coming from the shaft....enough to smell inside the cab.

 

 

 

 

 

 

 

 

 

Edited February 26, 2023 by poppy510

[poppy510]

Well I overlooked a leak at the clamp at the braided flex connector because it was leaking so bad it blew the soap right out without making bubbles. I used a shop vac backwards and blowing into the tail pipe to locate. Plugged the second pipe with a rag and taped the exhaust pipe cutouts (cooler vents) closed. Used tiger tape under the clamp and had to snug up the 02 sensor too. No more leak and no endless “cannot replicate” loop with the dealer. 

 

here is a link with more discussion about this apparently very common issue. https://www.duramaxforum.com/threads/dealer-cannot-fix-cel.1019251/page-8

 

 

 

 

Edited February 27, 2023 by poppy510
more info

[23DmaxYukon]

26 minutes ago, poppy510 said:

Well I overlooked a leak at the clamp at the braided flex connector because it was leaking so bad it blew the soap right out without making bubbles. I used a shop vac backwards and blowing into the tail pipe to locate. Plugged the second pipe with a rag and taped the cooler vents closed. Used tiger tape under the clamp and had to snug up the 02 sensor too. No more leak and no endless “cannot replicate” loop with the dealer. 

Cooler vents?

[poppy510]

3 hours ago, 23DmaxYukon said:

Cooler vents?

ya the cutouts in the exhaust pipes near the outlet. I think they let cold air to cool down the exhaust when it's going through a regen. Basically so you don't get burned when you walk by the exhaust.

[YakTownie22]

On 1/2/2023 at 6:05 PM, JT82 said:

I am experiencing the same issues with my 30 days since delivery 2022 Chevy C1500 Trail Boss. I blew it off at first to regen but now I even taste it when driving around town. I stumbled onto this thread tonight after search of “Exhaust fumes in Chevy 3.0”. Not very happy to be experiencing this. 

 

[YakTownie22]

2 minutes ago, YakTownie22 said:

 

My 2020 AT4 has around 38K miles, and my warranty recently expired. I've noticed a faint exhaust smell over the past couple of years, attributing it to diesel quirks. However, it's becoming more noticeable, and I'm concerned for my family's health.
Any chance GM or the dealer covers these fixes now that my warranty is over? I’m calling the dealership in the morning.
Appreciate the insights and support from everyone on this thread! The work order and pics shared have been incredibly helpful. Thanks, all!

[23DmaxYukon]

4 hours ago, YakTownie22 said:

My 2020 AT4 has around 38K miles, and my warranty recently expired. I've noticed a faint exhaust smell over the past couple of years, attributing it to diesel quirks. However, it's becoming more noticeable, and I'm concerned for my family's health.
Any chance GM or the dealer covers these fixes now that my warranty is over? I’m calling the dealership in the morning.
Appreciate the insights and support from everyone on this thread! The work order and pics shared have been incredibly helpful. Thanks, all!

Is your power train warranty expired? That one lasts much longer than the 3/36k bumper to bumper