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11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

Thread: Calling out all who had problems with DEF/Emissions Reply to Thread
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  Topic Review (Newest First)
Today 05:23 PM
continuum
Quote:
Originally Posted by PowayTom View Post
2012 GMC Sierra 3500. 97k miles
Failed emission reduction fluid injector part number 12647372
Failed #2 NOX sensor part number 12671388
Dealer replaced.
$1178.05 out of pocket
These were two of the parts on mine as well. That NOx sensor was the last thing they did on mine that I believe finally fixed the original issue.
Today 05:19 PM
continuum Wrapping up my story, hopefully not just for now...

The dealer replaced one of the NOx sensors and did a service regen multiple times until the DEF quality poor warning went away. They discounted my bill down to the original $1800 I'd already agreed to pay and I also got an alignment and key reprogrammed at that price. A nice gesture, but doesn't take the sting out of paying to replace things I don't think were wrong. Dealer had the vehicle almost 2 weeks.

To correct my mileage above... truck has 69,592 miles.

Between this and the chronic dash cracking issue, I'll likely consider a newer gas replacement. Maybe a 6.2L 1500 with the max towing package since that will handle what I do.

I'd encourage anyone going through this to push their dealer to spend time investigating the NOx sensors. Mine had no code pointing to them but I am convinced that is what the problem actually was. If anyone reads thinks differently I'd like to hear so I am better prepared if there is a next time.
Yesterday 12:38 PM
SheeB
Quote:
Originally Posted by Dean E View Post
I deleted the DPF and EGR on my LMM. No DEF to worry about. Honestly will all the issues everyone is having with this emission crap I will run my LMM till the wheels fall off. Love the power of the diesel but this emission stuff is not worth it anymore.
Pretty much have the same mentality now that my LML has been deleted and I had to replace the head gaskets last year and did ARP studs. Drive on!
Yesterday 09:11 AM
edktm 30k and check engine for the first time on the 2016 duramax
02-20-2020 06:41 PM
PowayTom
Injector and Nox Sensor

2012 GMC Sierra 3500. 97k miles
Failed emission reduction fluid injector part number 12647372
Failed #2 NOX sensor part number 12671388
Dealer replaced.
$1178.05 out of pocket
02-20-2020 08:50 AM
Dean E I deleted the DPF and EGR on my LMM. No DEF to worry about. Honestly will all the issues everyone is having with this emission crap I will run my LMM till the wheels fall off. Even the new L5Ps are having issues. If I ever get a newer truck I will probably go back to gas. Love the power of the diesel but this emission stuff is not worth it anymore. Damn near impossible to delete anything on the L5Ps. Dean
02-20-2020 05:31 AM
roy826 I won't have to participate in this thread anymore after yesterday. Finally all my parts arrived monday and I had it done yesterday.

Deleted the DPF, CAT, DEF, closed off EGR and added the +40 hp tow tune through Ez-lynk. 4" straight pipe from 3 bolt down pipe up to the stock over the axle tailpipe. Truck looks 100% stock under the hood and out the back. Not loud at all but you'd know it is deleted on crank up.

All it took was one emissions dash lit up back in january and I was fed up with the mess. Left 1 year of warranty on the table but sometimes you just have to move on.
02-19-2020 08:01 PM
redwngr If you've been reading, you already know I'd bet one or both NOx sensors too.
02-19-2020 05:58 PM
continuum 2012 GMC 2500HD Denali with the 6.6L diesel.

Jun 2014 @ 25,225 mi: New to me.
Apr 2017 @ 49,634 mi: MIL and Service Exhaust Fluid System message. Diagnosed as Reduction sensor open. Replaced DEF sensor unit (23379348). Covered under warranty.
Oct 2019 @ 65,264 mi: MIL light. Replaced 5 glow plugs under special warranty.
Feb 2020 @ 61,900 mi: DEF Quality Poor. UGH


Current work performed that did not resolve the issue:
1. First failed attempt: Replaced DEF (I always use Peak or O'Reilly ISO-22241-1 fluid so this seemed suspect)
2. Second failed attempt: Replace the DEF injector ~$1000
3. Third failed attempt: Replace the Engine Thermostats $800

Proposed next steps:
Replace the emissions control computer ~$800
Replace the SCR ~$3000


I've got them on hold right now while I consider next steps. They assure me they have spent a lot of time on the phone with GM diesel techs. I do not want to continue paying for them to guess what it may be. It seems like you should be able to test things prior to replacing them to diagnose where the real problem is. After reading a lot here I am curious why they haven't replaced any NOx sensors. When I asked they assured me they had checked their performance.

Any advice? (other than deleting the system, which I cannot do in my state/county) Does that GM Customer Service person still participate in this forum?




Thanks,


Jason
02-09-2020 10:25 AM
Austin James I’ve got a 2016 Duramax lml With 66,000 miles. I’ve got a p140b code and a p049d code showing at the same time. Clear it it doesn’t show back up on the same drive until I turn it off then back on again. But occasionally it’ll throw a nox code. It does sound like I got a bit of a tick sound. Especially when I’m at a dead stop and Accelerate, sounds nearly like it’s about to cut off sometimes. Went into regen, everything ran fine, and when I stopped at the house put my truck in park the truck started to surge pretty badly. Jumping from 640 rpm to close to 800 repetitively.I’m getting a delete tune, and egr delete and def delete Tuesday. I’m just hoping that’ll fix my issue
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