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8 Posts
Discussion Starter · #1 ·
Hey all. Needing some help...

I have a 2016 LML. Elected to go with the S & B 'wet' filter intake. I had ran the same brand/style on my 2009 Powerstroke and liked it.

Long story short.. Having major issues.

Towed my 26 foot travel trailer 3500mi over a 30 day period and was plagued with intermittent check engine light. Had my own code reader, and this is what lit up:


The truck has 64k miles on it, and I have taken pristine care of it with all of the regular scheduled maintenance, premium fluids, etc.

I've been running Duramaxtuner tune file (in sport econ mode) since April 2018 and put about 25kmi on the truck. During the trip mentioned above, I ran their 'light tow' tune. Upon the check engine light coming on for the first time, I flashed the truck back to stock right away.

I've running the S&b intake since February 2020, and only put about 10k mi on the trick with it.

I brought the truck with check engine light into my local/friendly Chevrolet dealership that I have dealt with for a long time. They are giving me a tough time, mentioning that 'aftermarket air filters/intakes' are known to cause major problems with the LML platform - and that they'd strongly recommend removing it and replacing it with the stock air box. They mentioned specifically that they have even seen engine rebuilds due to air intake issues. (which I thought that seemed a bit extreme?) At the end of the day it's just an air filter...

The dealership also mentioned that the truck's Turbo is going to need to be replaced based on one of the codes above. Fortunately, they are going to cover it through warranty, despite the intake technically being an alteration of the platform.


1. What do you think caused the Turbo to go out specifically - the Duramax Tuner tune, or the S&b intake?

2. Regrettably, I was on the fence, and decided to toss the stock intake after installing the s&b in truck. Chevrolet wants $950 for a replacement stock intake (parts). Should I remove the s&b, and repurchase a stock intake?

3. Doing a bit of research on the forums, I have heard that on the LML platform, the MAF sensor is known to have problems with even the slightest amount of filter oil being sucked in. With this, should I have gotten s&b's dry filter option instead? Should I loop in s&b on this issue and request they send me a dry filter?

4. The s&b intake came with a rubber plug that goes in the bottom of the intake box. It lists the piece as optional during install, obviously allowing for more airflow with the plug removed. I had left it out upon install. Would adding the plug back in make a difference / possibly help resolve this?

Long read.. Thanks for following along. I hope that this post helps others, and I also hope that someone might be able to shed a bit of light so I can figure out my next steps... As of right now, Chevrolet has a replacement turbo on order that will be here in the next week. I will need to decide what to do with the s&b. I want to avoid future issues as I plan to keep the truck for awhile.

Thx in advance!


2016 LML

8 Posts
Discussion Starter · #6 ·

So, I reached out to S&B... I looped them in the recent issues. They offered to send me a stock LML air box set up to appease the Chevrolet dealership if it comes down to that, which I accepted. It arrived within a couple days. They also did made very strong point that they believe there is no chance that the s&b 'wet filter' (versus dry), had an impact on causing the check engine light / codes.

After doing more forum research, there's too much evidence to deny that a 'dry filter' is a better option for an LML. Accordingly, I ordered the S&B dry filter replacement option, and now have it innstalled in the truck.

The warranty turbo is on order and should arrive within the next 10 days. We will go from there!
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