Diesel Exhaust Fluid issue hopefully resolved

[Ranger007]

After 39k of flawless miles with 2011 duramax. I'm now getting the DEF quality poor also. On the first go round i was able to clear the problem with 70mph runs, then the CEL light came on after the quality light was gone. Took it to the dealer at 39k they did the re flash and all was well for about 2000 miles.

Now at 41k and quality poor is back on. cleared it with 70 mph run. Light is now off, but still went to dealer. Dealer says not running GM DEF fluid is causing the light. Which I think is total BS since I have been using blue DEF for the life of the truck. Dealer is running on tech 2 now to see if anything else shows up. Will report back on that

Does anyone have the bulletin for NOX Sensor change?

Anyone have problem come back after NOX sensors were changed??

[gr8dane79]

Yes they change my front nox sensor...light came back on...they changed my rear nox sensor...light came back on....then last fix, they cleaned def injector, so far so good...but I'm trading it in next week on a 1500 6.2 L gas engine with max tow package, I've lost all trust in my truck, nervous to even take it out of town

[sierra2500HD]

Same thing happened to me here in FL the first time I had the Poor Quality DEF warning. I was charged $140 to have the fluid drained and replaced. I guess I got off easy compared to you. After the 3rd trip back when they changed the rear NOx sensor, I argued to be reimbursed for that $140 because the fluid was obviously not the problem. I got the same BS about "All we can do is follow the diagnostic procedure..". No matter how much I argued they wouldn't budge.
I like the truck but really hate this DEF problem and the way GM service has decided to handle it. Piss poor and if this problem continues there is no way I'll buy another GM vehicle.. ever.
BTW - my truck is a 2011 2500HD with just under 11K miles.

Originally Posted by jphippsjr

What I have tried arguing withe the dealer and customer service. I had to pay $353 because they had to drain my DEF tank when the fluid quality was not the cause of the of the code. The only thing the dealer has to go by on fluid quality is what "the truck tells them". They don't sample and analyze the fluid, they just dump it and put fresh in. Therefore it is "not covered under warranty since it is a fluid I add". When the code comes back in a few months it will be the same issue. Not fixing the problem, just clearing the code and charging me. If their solution is to drain it and add fresh every time, why not put a drain plug so I can do it myself? Or hey, better yet why not go through the entire system and fix it and get it right. They have no basis on using poor quality fluid as an excuse. The truck does not have a fluid analyzer, it has NOx sensors (or analyzers) which analyze the amount of nitrogen oxides in the exhaust, not the quality of the DEF. So when the NOx level reads high and the sensor reads to be good, it is automatically assumed to be the quality of the exhaust fluid. For GM to charge me for this, they should have some way to test the fluid, not just say "the truck told me so" (the service manager's words).


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[jphippsjr]

Originally Posted by sierra2500HD

Same thing happened to me here in FL the first time I had the Poor Quality DEF warning. I was charged $140 to have the fluid drained and replaced. I guess I got off easy compared to you. After the 3rd trip back when they changed the rear NOx sensor, I argued to be reimbursed for that $140 because the fluid was obviously not the problem. I got the same BS about "All we can do is follow the diagnostic procedure..". No matter how much I argued they wouldn't budge.
I like the truck but really hate this DEF problem and the way GM service has decided to handle it. Piss poor and if this problem continues there is no way I'll buy another GM vehicle.. ever.
BTW - my truck is a 2011 2500HD with just under 11K miles.

Yeah, I hate to say it, but this will probably be my last GM truck. I really liked my truck until all of this BS. GM customer service was absolutely no help at all! They side with the dealership and blow off the customer (and called me a liar in the process). I'm not sure what the GM customer rep (Michelle) on here is doing other than reading all of our rants. She needs to let her GM bosses know that they are losing customers over this damned exhaust issue. I asked the service advisor at my dealer if they would refund my $353 when the truck does it on their fluid and of course they said "no". And obvioously they raped me on the charge to drain the tank. How can it only cost $140 in Florida and $350 in Louisiana? Can you answer that Michelle @GMCustomerService ?

[Matchrocket]

Originally Posted by nmeyer414

you know, the more i think about getting rid of my LBZ for something new, i just pull up threads like this and i am reminded why i keep ol girl.

X2... I have enough emissions fun on my wifes TDI...

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[Ranger007]

NOx sensor #2 replaced today

tech note says sensor 2 read erratic between 36PPm and 9PPm, replaced and reset NOx sensor 2

I hope this fixed the problem
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[msdunkel]

Originally Posted by DENALI HD3500

Nox sensors are not located on the DEF tank, they are in the exhaust stream,. If you do lots of idleing or short trips , you are likely to get these messages again. I have 163,000 miles on my LML now 100% stock and never had a CEL or DEF quality issue yet. My truck is almost always towing and is run hot every trip it goes out, i think this is why i have never had a single issue with the emissions.

Just curious, what does the truck consider a "short trip"?

[gregmp15]

I fixed my problem by trading it in on a gas 1500.
Wish gmc would step up on these problems.

[gr8dane79]

Me too...I traded in ny LML for a brand new 2013 1500 with the 6.2 NHT package