Regen; how to tell? - Chevy and GMC Duramax Diesel Forum
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Old 04-07-2012, 07:24 PM   eBay Motors  #1 (permalink)
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Regen; how to tell?

I have a 2012 duramax an I can't seem to tell when it goes into regen. It had 800 km worth of city driving before I took it on a snowmobile trip that I am currently on. It now has just over 2000 km on it. Does the DIC tell you when it's regening? On that 1200 km highway drive I couldn't tell at all if it regened. I would assume it should've by now.
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Old 04-07-2012, 07:31 PM   eBay Motors  #2 (permalink)
it stinks and whistles :)
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Someone correct me if I'm wrong bit I think you get a message on the dic while in regen


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Old 04-07-2012, 07:32 PM   eBay Motors  #3 (permalink)
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If you don't notice it, it's working like it should

If you get an edge insight CTS (gauges only) you monitor regen, as well as a lot of their things.
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Old 04-07-2012, 07:33 PM   eBay Motors  #4 (permalink)
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The dic won't tell you. The truck overall will not tell you. I've read that you see decreased fuel economy but not sure if you can really tell by monitoring the mpg from dic. Some say it smells different, which I've noticed, but not sure if what I'm smelling is regen or not.

So basically I don't think you can tell unless you have cts.

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Old 04-07-2012, 07:35 PM   eBay Motors  #5 (permalink)
it stinks and whistles :)
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I thought there was a "cleaning exhaust filter" message? Oh well ignore my last post


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Old 04-07-2012, 07:36 PM   eBay Motors  #6 (permalink)
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no messages, gm does not want you to know ...LOL
but there are some clues like the compass will not work correctly (mine likes to say NW)
elevated idle and a "hot" smelling exhaust
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Old 04-07-2012, 08:29 PM   eBay Motors  #7 (permalink)
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The idle will change to a much deeper sound, egts will go up an you will most likely smell it outside the truck. Mine also feels like it pushing a bit when slowing to a stop. There are no messages unless something is wrong like going to far without a regen, bad def etc. On mine the idle sounds like my old LLY did with a tuner on it at idle, lub lub lub best I can describe it.
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Old 04-08-2012, 05:48 AM   eBay Motors  #8 (permalink)
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The idle will be elevated to ~800 rpm to maintain exhaust temps when you stop during a regen. That is the most noticeable symptom. If you don't stop during a regen, you may never notice.

The drive to clean exhaust filter message only shows up if you've driven the vehicle in a manner that prevents a normal regen from taking place (rare).

A regen takes about 30 minutes of driving time above 30 mph to complete. The 30 minutes do not need to be continuous; if you stop during a regen, it will resume the next time you drive your truck. Bottom line: don't worry about it, just enjoy driving your truck.


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Old 04-09-2012, 12:56 PM   eBay Motors  #9 (permalink)
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Quote:
Originally Posted by skidoochris View Post
no messages, gm does not want you to know ...LOL
but there are some clues like the compass will not work correctly (mine likes to say NW)
elevated idle and a "hot" smelling exhaust

Mine does the same compass thing. I was driving due South and my compass said NW.. I just started to laugh, figured my new truck already had a mind of its own...

Once I noticed the compass being out, I did an instant average while Hwy driving and I had dropped 3 mpg from my normal 18 at 75mph. It stayed low for 10-15 minutes then went back to 18 mpg. I dont know how long I was into the regen, but did notice a big swing in MPG for a short time.

There was no difference in my driving or the conditions, so I definitely think while in regen, its using a bunch of fuel.
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Old 04-09-2012, 02:03 PM   eBay Motors  #10 (permalink)
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If I am heading north and the compass says SW I know I am in regen,also if I shut if off during a regen I notice a burning smell.
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