Thank you a ton for posting this video. Been stressing over this same problem and rationing my miles for 3 days now. Changed both sensors and ran the regen and bay test and everything is kosher now 😅
If the system is locked out . Unplug the transfer case speed sensor and shift manually , you will still have the def issue but you can drive at higher speed til you get it fixed properly
my 2015 had same last week. i added 2.5 gallons. in 100 miles of driving it cleared up its self. wow. what a pain!! in 2018 i myself replaced the Bosch def heater pump with a bosch. under 200 bucks amazon.
I own one of these trucks, I was also a diesel mechanic for a internationally known engine manufacturer. It’s my opinion that your not familiar enough with what the emissions system is trying to achieve, or how it goes about it. Yes it’s a pain in the ass when you have to spend money on something, but that aside, the system as designed is prompting you to deal with a malfunction in a timely manner, as it goes into a series of self protection “ limp “ modes. It’s the old saying, fix the problem, not the symptom.
If you watch the video, I diagnosed it as a bad NOX sensor, by checking it in multiple ways. Pretty straight forward. Nothing complicated about the emissions system on this truck.
My NOx sensor went out while on a long trip. I made it 50 miles from the nearest Dealer before having to be towed the rest of the way. 2017 Colorado 2.8L
I have a 2022 z71 duramax and I think I might be having the same issue. My dash says just “DEF exhaust quality poor, see owners manual and it’s really vague”. It came up once and this is the first time. I love been looking into it and I don’t want to get stranded. And recommendations? I have 12k miles :/
My 2019 ZR2 2.8l keeps getting code P026D. NOX sensor is the suggested fix. I have never let it get to the point where it warns that LIMP mode is about to happen. I have been taking the truck to the dealership for over a year at this point! The truck has physically been in the shop for 225 days! They have replaced the NOX sensors 9 times, MAP sensor 3 times, 2 EGR valves, replaced all fuel injectors, replaced the turbo, replaced the entire intake because it was totally gummed up. GM doesn't know how to fix it or is not willing to fix it. I cant speak about any legal action I may or may not have taken, but at this point I really want my truck fixed. Any ideas that does not result in massive weight reduction?
P11DB code and I have replaced Both Bank 1 and 2 and reset the code. It stays off pretty much for a long while Until I sit and Idle for 10 minutes. I have not disconnected the battery yet (does it have a cmos reset). Chevy replaced the 1st bank and I replaced the 2nd. smh. ZR2 2018 2.8 55K miles
What happens if I continue to drive my truck with this message on? The truck is loosing some weight in about a week if you know what I mean, but in the meantime wondering if I can drive or I should park until it’s appointment?
@@rudyshoplopez7366 I parked it for about a week until I got it deleted it. To get that work done I drove an hour with the message on and 10 minutes into the drive the message disappeared 🤦🏻 but I got the work done anyways
@@pucheco69 ruclips.net/video/RNSLfb-4Hts/видео.html try that link. Look under passenger side right between the doors. For a sensor that has a small ECU.
@@venturahwy76 about to swap my 2 NOX sensors, have a different computer, are these reset tests called: step 1- “ DPF Service Regen” step 2- “Reductant System Malfunction Warning Service Bay Test”
I was down to 5 mph limit on 2017 LWN ZR2 with "Exhaust Fluid Quality Poor" message. Scanned it, nox sensor 1 showed bad so replaced it. Drove 5 miles to warm up. Parked, did regen and it went up to 2,500 rpm for about half an hour. FYI sounds like a tree grinder running. Kinda loud. Cleared code and did efficiency test which took about another twenty minutes. Test passed and and emediatly "Exhaust Fluid Quality Poor" and DEF light went off. It's all back to normal now. Borrowed a Snap-On diagnostic tool.
Just happened to me. Stuck on the side of the road with 4 mph limit until i found a video saying to disconnect the speed sensor from the transfer case. Took 2 min and i was up and running. At first start you need to shift from drive to neutral then back to drive or you won't leave 1st gear. I was able to go about 55mph and was able to make it home.
@Germain Gonzaiz >>> You know theirs a allowed bypass of the DEF systems in many trucks that use DEF peterbuilt for one ! So I think this guy with his GM product (chevy) needs to remove & install a bypass with a reprogramming from experienced tech, it worth their money in gold. I've done it over here & I'm not in the USA for ease of mind from this not happening. Yes it's a bit of a no-no but I passed a few MOT's without a issue.
Thank you a ton for posting this video. Been stressing over this same problem and rationing my miles for 3 days now. Changed both sensors and ran the regen and bay test and everything is kosher now 😅
Gm has made an engine that destroys more emissions than it produces. Well done.
Old comment but, LOL, great reasoning, we all need these trucks to clean the world.
If the system is locked out .
Unplug the transfer case speed sensor and shift manually , you will still have the def issue but you can drive at higher speed til you get it fixed properly
my 2015 had same last week. i added 2.5 gallons. in 100 miles of driving it cleared up its self. wow. what a pain!! in 2018 i myself replaced the Bosch def heater pump with a bosch. under 200 bucks amazon.
What part your change def
DEF has shelf life. All the diesels today do NOT let you drain the tank and refill with fresh. Stupid move diesel world.
I own one of these trucks, I was also a diesel mechanic for a internationally known engine manufacturer. It’s my opinion that your not familiar
enough with what the emissions system is trying to achieve, or how it goes about it. Yes it’s a pain in the ass when you have to spend money
on something, but that aside, the system as designed is prompting you to deal with a malfunction in a timely manner, as it goes into a series of
self protection “ limp “ modes. It’s the old saying, fix the problem, not the symptom.
If you watch the video, I diagnosed it as a bad NOX sensor, by checking it in multiple ways. Pretty straight forward. Nothing complicated about the emissions system on this truck.
My NOx sensor went out while on a long trip. I made it 50 miles from the nearest Dealer before having to be towed the rest of the way. 2017 Colorado 2.8L
What the cost for a scanner like that?
I have a 2022 z71 duramax and I think I might be having the same issue. My dash says just “DEF exhaust quality poor, see owners manual and it’s really vague”. It came up once and this is the first time. I love been looking into it and I don’t want to get stranded. And recommendations? I have 12k miles :/
Same here and I have 16k on mine
My 2019 ZR2 2.8l keeps getting code P026D. NOX sensor is the suggested fix. I have never let it get to the point where it warns that LIMP mode is about to happen. I have been taking the truck to the dealership for over a year at this point! The truck has physically been in the shop for 225 days! They have replaced the NOX sensors 9 times, MAP sensor 3 times, 2 EGR valves, replaced all fuel injectors, replaced the turbo, replaced the entire intake because it was totally gummed up. GM doesn't know how to fix it or is not willing to fix it. I cant speak about any legal action I may or may not have taken, but at this point I really want my truck fixed. Any ideas that does not result in massive weight reduction?
Im sorry to hear. That sounds absolutely ridiculous
P11DB code and I have replaced Both Bank 1 and 2 and reset the code. It stays off pretty much for a long while Until I sit and Idle for 10 minutes. I have not disconnected the battery yet (does it have a cmos reset). Chevy replaced the 1st bank and I replaced the 2nd. smh. ZR2 2018 2.8 55K miles
What happens if I continue to drive my truck with this message on? The truck is loosing some weight in about a week if you know what I mean, but in the meantime wondering if I can drive or I should park until it’s appointment?
Can you tell me if you kept driving it? I just got the message yesterday
@@rudyshoplopez7366 I parked it for about a week until I got it deleted it. To get that work done I drove an hour with the message on and 10 minutes into the drive the message disappeared 🤦🏻 but I got the work done anyways
Yeah Where is the FIx??
Can you tell me what Launch scan tool model you have in this video? Would like to get one similar to that model.
I don’t know his model but I have the x431 ace elite and it’s amazing. Never had something I can’t do with it as a professional tech
My 2020 gmc Denali did that 4 times they are gonna buy back or replacement
Did you ever figure out how to reset the light? I had the same issue
Changed nox sensor
Regen, then run bay test to reset system
Can you tell us how to change the nox sensor, price and where is located?
@@pucheco69 ruclips.net/video/RNSLfb-4Hts/видео.html try that link. Look under passenger side right between the doors. For a sensor that has a small ECU.
@@pucheco69 you will need that special test that OP is talking about though. Without the test the codes will not go away
@@venturahwy76 about to swap my 2 NOX sensors, have a different computer, are these reset tests called:
step 1- “ DPF Service Regen”
step 2- “Reductant System Malfunction Warning Service Bay Test”
Which Launch scanner is that?
So, all of us GM owners are supposed to own a scan tool and understand how to use them? That wasn't told to me when I bought my truck
How did they clean the warning code?
You need to regen the system, then run the reluctant bay test, if it passes it will clear the message.
I need to get this scanner. What is the make and model of it.
Launch 431 bi directional
Generally it's the def injector but is almost always you've got a clogged catalytic converter
So what ever fixed the truck?
I was down to 5 mph limit on 2017 LWN ZR2 with "Exhaust Fluid Quality Poor" message.
Scanned it, nox sensor 1 showed bad so replaced it.
Drove 5 miles to warm up.
Parked, did regen and it went up to 2,500 rpm for about half an hour. FYI sounds like a tree grinder running. Kinda loud.
Cleared code and did efficiency test which took about another twenty minutes.
Test passed and and emediatly "Exhaust Fluid Quality Poor" and DEF light went off. It's all back to normal now. Borrowed a Snap-On diagnostic tool.
New nox sensor fixed the problem. You may also have to run the reluctant system test to reset the limp mode.
Can we know the scan tool you are using thanks you
It's a launch 431
Thanks it’s the x431
Yes I have the X431V+ version. A x431 may work also
@@venturahwy76 thank you for letting us know about the scanners.
The old tried and true Pepsi bottle spit toon?
need to get to the point
Got stuck in limp mode (5mph) hauling a trailer 2 hour drive turned into 8 hours
Just happened to me. Stuck on the side of the road with 4 mph limit until i found a video saying to disconnect the speed sensor from the transfer case. Took 2 min and i was up and running. At first start you need to shift from drive to neutral then back to drive or you won't leave 1st gear. I was able to go about 55mph and was able to make it home.
8 hour drive drive turned into a 2 day drive for me, limped into a dealer. Towing a 20 ft. Trailer and im 600 km from home.
The EPA is a bunch of damn crooks
Down stream NOX sensor
I just deleted everything. Dpf egr nox bla bla..and some more boost and damn
At happened to me🤦🏻♂️🤦🏻♂️
Thank Obama for that. He is the one that forced manufacturers to do this. Every diesel vehicle is like that, even semi trucks
@Germain Gonzaiz >>> You know theirs a allowed bypass of the DEF systems in many trucks that use DEF peterbuilt for one !
So I think this guy with his GM product (chevy) needs to remove & install a bypass with a reprogramming from experienced tech, it worth their money in gold. I've done it over here & I'm not in the USA for ease of mind from this not happening. Yes it's a bit of a no-no but I passed a few MOT's without a issue.
I run diesel ambulances and they are not all like that. Def diesels suck. It doesn’t limit your speed but the exhaust smells something awful.
De1ete it...