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Discussion Starter #1
Hi, I’m new to the forum. Been reading the posts by others. Seems there is an ongoing issue
with the( DPF ) diesel particulate filter system. I also had 2 visits to the dealer for this issue with less than 16,000 miles. My truck stock and I use only top tier fuel. Last Labor Day drove to Spokane Wa.from near Milwaukee Wi.and back. No issues till this summer. (DPF).
I know it would be a lot of work , but maybe we could all form a group and contact Chevy with
a large number of owners (as a group)with this (documented) issue and have more influence on getting this issue resolved. I love this truck and the 2.8 dmax ,however if this is issue isn’t going to be remedied, and I have to pay for repairs, the truck will be gone!
 

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I've had my DPF system completely replaced, minus the the tank/heater assembly, and all under the original warranty. So far, so good. Took me five trips to the dealer, but compared to others on here, I had a better experience and it wasn't even my purchasing dealer that did the final fix. Good luck! Mac:)
 

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I had enough of the diesel emissions issues... traded my 2016 Z71 in yesterday for a 2019 Z71 gas version.
It was an on going issue from the start.
 

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I have has an issue from day one. 12 trips to two separate dealerships and the issues remain, specifically with Particulate Matter Sensors. Common DTC's I have seen are P1476, P1478, P24B0, P24B1. Diesel Particulate Sensor has been replaced 5 times, Engine Gas Temp sensors twice, NOx sensors twice and Engine Control Module reprogrammed twice. There is a recall for faulty Particulate Matter Sensors (sorry, don't have number) and just learned there is a Technical Service Bulletin for a "software anomaly" in the ECM (#19-NA-124)
GM's official response has been: "Do now wash the undercarriage, sensor failure is due to thermal shock."
 

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Discussion Starter #5
Grearhead. I’ve been doing research on the DPF issues. I believe it’s the cetane rating in U S. In the U S cetane only has to have a 40 rating. In Europe the minimum rating is 50. The 50 cetane burns faster and cleaner.
The 40 cetane leaves more soot in exhaust.
Can anyone get 50 rated diesel in the U S.
GM should do lab tests on the cetane rating.
 

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You can get 50 but I believe it’s rare. Supposedly more places in California I believe it is have closer to 50.
 

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You live in Canada and they don’t post cetane or octane on the pumps.
you never know what your getting...
 

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Hell, I live in Wisconsin and they don't always have cetane posted on the pump.
 

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I have a 2017 2.8L 2wd Colorado diesel. I have a question about the DPF regeneration process. Does the 2.8L regeneration cycle in the Colorado occur by an injection of additional diesel into and/or through the engine on the exhaust stroke or is the additional fuel injected into the DPF directly. I ask because I've heard that engines adding additional diesel through the engine on the exhaust stroke increases fuel oil delusion very significantly.
 

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Has an additional 5th injector right ahead of the dpf
<<<THANKS>>> for what it's worth, I have never had a DPF or emissions issue in nearly 38K miles save for the little blue DEF cap sticking and refusing to come off. Had plenty of other annoying GM quality issues having to do with AC wiring, radio antenna, radio, and dash accessory lights in the first few months to one year. Still, I LOVE THIS TRUCK even the 6spd automatic. Sure wish there was a manual six speed tranny. Again, many thanks!
 

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I have has an issue from day one. 12 trips to two separate dealerships and the issues remain, specifically with Particulate Matter Sensors. Common DTC's I have seen are P1476, P1478, P24B0, P24B1. Diesel Particulate Sensor has been replaced 5 times, Engine Gas Temp sensors twice, NOx sensors twice and Engine Control Module reprogrammed twice. There is a recall for faulty Particulate Matter Sensors (sorry, don't have number) and just learned there is a Technical Service Bulletin for a "software anomaly" in the ECM (#19-NA-124)
GM's official response has been: "Do now wash the undercarriage, sensor failure is due to thermal shock."
Same here. I have not been told "do not wash undercarriage." This is a truck, right? Just had P1478 reappear for what seems like the hundredth time. This will be the last, however. Getting the sensor replaced and the truck will be traded in. What I tell people when they ask me about the truck is, it's great when it runs.
 

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I had a check engine light after getting new tires, no idea why. Don't care. Cleared the light and moved on.
 

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I have a 2017 Colorado Duramax at 70000 miles the check engine light came on took to dealer code is P2002 they are telling me I need a new DPF has anyone had any luck cleaning these filters? My truck never Regens this is supposed yo clean the DPF? Why would my truck not regen?
 

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I have a 2017 Colorado Duramax at 70000 miles the check engine light came on took to dealer code is P2002 they are telling me I need a new DPF has anyone had any luck cleaning these filters? My truck never Regens this is supposed yo clean the DPF? Why would my truck not regen?

How do you know it never regens? ... Yes you can clean it look at some youtube vids and you can see how it's done.
There are a few things that could have caused the DPF to go bad early.
What type of oil have you been running?
Is it dexos2 approved oil? If not that could be a cause.
The other would be if you're constantly doing short hop trips and there is never enough run time to effectively preform a regen, it takes about 20 minutes at hwy speeds. Are there any sensors that maybe are not working properly.

You can thank the EPA for these issues and other demands they are forcing into the marketplace that all manufacturers and owners have to now live with. This is why owning a diesel now, you really need to know how this stuff works to determine if you are situated properly to take advantage of what the diesel has to offer over a gasser version.

You would have never made it 70K miles without a regen, that DPF would have been so clogged the engine would not been able to start due to lack of airflow.
 

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There are shops that professionally clean DPFs. If not covered by the emissions warranty (should be within 80K miles) that would be a cost effective option vs. replacing it.

Big rig DPFs are made to be taken apart and cleaned, ours are not, but a good shop can cut and re-weld DPFs from pickup trucks. Here is an informative PDF on the topic.

 
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Hello all. I’m new to this forum and my truck. I have a 2019 2.8L diesel Colorado. It currently has 19587 miles on it. My engine light came on so I took it to the dealer. They said I need to replace my DPF, (I just had them change my diesel fuel filter during my last scheduled maintenance appointment less than a month ago). Luckily it’s covered under warranty but I worry that this is the beginning of the end for the reliability and life of my truck. Does anyone know what the stats are for this? Is my truck going to constantly have emissions system issues? If so, I guess I need to trade it in for some other type of truck. Is this a common issue for all diesel motors or just GM/Chevrolet trucks? I prefer Diesel engines for the torque and better fuel mileage. Does anyone have any information or advice for me? Thanks.
 
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