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Discussion Starter · #1 ·
I've gotten the message on my dash to keep driving cleaning exhaust filter. I've been driving for 45 minutes straight at 130kmph on the highway. It still hasn't gone off. I'll be driving for another couple hours and see if it goes off. Anyone else experience it not going off?
 

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Discussion Starter · #5 ·
Please keep us update on this issue.
I will. It's odd because I know I didn't miss a Regen. 2 weeks before I drove 4250km to the coast and back. The truck sat for a week after at the paint shop getting the hood repainted because it was scratched when I bought it. It drove 25km during that week. Then I top off fuel to head to work and it comes on. I figured it would go off in the 3 hours but it stayed on the whole time. Tomorrow afternoon I should have more info. It only has 18000km and every 5000km so far it's been in the shop for an engine light for faulty map sensors and now this. Not pleased with this truck at all.
 

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I've gotten the message on my dash to keep driving cleaning exhaust filter. I've been driving for 45 minutes straight at 130kmph on the highway. It still hasn't gone off. I'll be driving for another couple hours and see if it goes off. Anyone else experience it not going off?
I've gotten the message on my dash to keep driving cleaning exhaust filter. I've been driving for 45 minutes straight at 130kmph on the highway. It still hasn't gone off. I'll be driving for another couple hours and see if it goes off. Anyone else experience it not going off?
I have 30K miles on my Colo Dura, and I have never had it go into regen! Not sure why. I usually go 4k miles and still can't get in a whole 2.5 gal box of DEF in the tank! The knocking you may be hearing is me knocking on wood...real oak wood. One thing is sure, I don't lollygag when I drive.
 

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Discussion Starter · #8 ·
I have 30K miles on my Colo Dura, and I have never had it go into regen! Not sure why. I usually go 4k miles and still can't get in a whole 2.5 gal box of DEF in the tank! The knocking you may be hearing is me knocking on wood...real oak wood. One thing is sure, I don't lollygag when I drive.
I definitely don't bag drive the truck. It's just for highway driving to work and back 700kms a week.
 

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Update! The dealer said the truck had 235% soot level in the dpf and wouldnt go into Regen mode by itself. They forced a service Regen and it's now sitting at 0% soot level. They had no answers as to why a truck that's only 5months old with 18k kms on it is having this issue. They said to monitor it because they couldn't find anything wrong. I'm certainly not happy with that answer. A new vehicle shouldn't just not Regen for no reason.
 

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I have 30K miles on my Colo Dura, and I have never had it go into regen! Not sure why. I usually go 4k miles and still can't get in a whole 2.5 gal box of DEF in the tank! The knocking you may be hearing is me knocking on wood...real oak wood. One thing is sure, I don't lollygag when I drive.
Your truck has went through a regen, trust me. It just happens in the background and you don't know the difference. When it does one, your instant mpg's will drop down lower than they normally are and your truck will be more responsive than normal on the pedal. The only time you will ever get a message saying it is going in to a regen is if you do a bunch of city driving or idling and never get it up to highway speeds for a half hour.

Also, if you're not getting a 2.5 gallon box in to your DEF tank, then you aren't letting it get low enough. Wait until it gets down to 30% or lower and then add 2.5 gallons. You won't hurt anything letting it get down to even 10% or below. You cannot however add 5 gallons, unless perhaps you were totally empty.
 

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Update! The dealer said the truck had 235% soot level in the dpf and wouldnt go into Regen mode by itself. They forced a service Regen and it's now sitting at 0% soot level. They had no answers as to why a truck that's only 5months old with 18k kms on it is having this issue. They said to monitor it because they couldn't find anything wrong. I'm certainly not happy with that answer. A new vehicle shouldn't just not Regen for no reason.
I've heard of it happening. Not normal though. If you did a bunch of city driving or idling and never got it up to at least 45 mph I believe it is for 20-30 minutes, it won't fully complete a regen. If you got up to speed but for a short time then shut it off, it won't complete either. So, I could see it getting up to that level if those parameters were met.
 

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I had an experience that sounds too familiar, at about 18K on the way home from San Angelo (to fort worth) all highway, my Dash indicated it was in a region for the entire 5 hours again at highway. NO CODE. It did not use DEF. So here was the finding, a bad cable to a NoX sensor. (not so sure) so I purchased an elm327 and use OBD fusion on my iPhone. I set up a dashboard and I monitor the 2 NoX sensors (both PID bank 1) and the 4 exhaust temp sensors (also indicate bank 1)when on trips. I also invested in Torque and BiScan (an adapter to torque) which allows you to do extended service diagnostics.

If NoX sensor 2 has a temperature issue, is dirty or other things, it is possible that your computer thinks the NoX is under control, and you will use little DEF. There are other things but with GM having already opened the parameters on this and the dual nature of that sensor (Nox and DEF efficiency) with being controlled by temperature (until the ECM sees it is up to temp) it does not kick in. Good luck, the Emission system baffles out tech's out there and GM is closed mouth I believe fearing the government really pealing back things.
 
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