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Discussion Starter #1
Hey everyone! I know there are several topics on this already; just wanted to post my situation as it is fairly similar and maybe there are some new answers I am not aware of. I have a 2018 diesel canyon with 38k now. Last spring I started getting a slight rough idle after remote start for a couple minutes then shifting to drive. It would bounce a couple 100 RPM and I would drive down the street to the stop light then it would be gone. Been on and off since then and at this rate I thought it was normal. My daily commute is 25 miles each way with traffic and with normal driving conditions. Regens are normal; about 2 times a tank full and I remote start every morning before I leave to warm it up a little bit. I am posting now as the other day was getting me worried a little more. Did a normal remote start and started rough idling right away (usually doesn't when doing remote start), waited a few minutes to see if it would go away and didn't. Got to the first speed bump in my apartment complex and went over it and it almost stalled so now I'm hoping maybe there is a new answer? Idk at this point as my usual dealer doesn't get many canyon diesels in. I get no CEL's and no hidden codes are found and I only use the AC delco DEF from the dealer; I don't trust peak or any of those brands. Lastly, this is my second canyon diesel and my other one (2016) never had this issue. That one just had a bad DPF sensor after their initial USA release. Any suggestions are appreciated!
 

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Most trucks regen once per tank full (of fuel) as I recall. Twice seems excessive. And do your "normal driving conditions" include 20-30 minutes of 45mph or greater sustained speeds? I believe that is the speed and time threshold that is needed to achieve a DPF burn. If not, maybe that's why you're getting two burns per tank of fuel. It really would not surprise me at all if you have a plugged DPF even on a lower mileage truck. Which, with the idling each time for up to 10-20 minutes to let it warm up before you drive, and if you aren't getting up to speed for long enough, then I can most definitely see it happening.

Other than that, I'm not sure what else it could be.
 

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Discussion Starter #3
Nope speeds vary between 45 to 75 normally. I do believe it's 2 per tank full but I could be wrong. It maybe almost time for one as it hasn't came on since last Tuesday if i recall. When i do get one, i try to continue to drive until it burns off. Mine are weird as they will pop on after I get off the highway.

Not sure either man. Thanks for the reply though
 

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I realize this is a slightly disappointing solution, but do you really need to use the remote start and let it warm up? The engine doesn't need that and you waste fuel and emissions. I often start mine at well below freezing temps and sometimes below zero F. Start engine, turn on heated seats and steering wheel, fasten seat belt, drive away. I've found that I'm durable enough to withstand a minute or 2 of chill (coats are pretty effective in the winter..). That has worked fine for 220k mi and counting on my VW TDI and for the 20k I've had my Colorado.
 

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I've been experiencing this too, I'm not sure it's related to remote start. Last time I had it serviced they applied a recall fix to the ECU that was related to excessive regens, and since then I have not experienced the issue (although because it was intermittent I can't be sure it's fixed).
 

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Discussion Starter #6
Yeah it does it regardless of using remote start or hopping in, starting up, and going. It seems like it does it when the trans temp is below 60F. Once above 70 - 75 it goes away. I had a ECM reprogram on my first canyon because of excessive regens, never this issue though.
 
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