It deff regens more often than my lml did. I don't have enough mileage to know how this will go. But knock on wood almost 2000KM and no issues.

Regen will start when needed and continue till you turn it off or it's done. Next start up once warm enough it will just continue regen if it wasn't done. If it gets too plugged thats when a warning will tell you to drive until done.

 

Thanks for the reply....... I do use the highway but, mainly on weekends. I'd like to add, it's not always 30 minutes or more. A couple weeks may go by before I drive a solid 30 minutes or more then what? Get on the E-way and drive 70 miles an hour for 30 minutes? I've got to say, this in all likelihood would have been a deal breaker. In a word "Ridiculous."
As for DEF fluid, I had a 2015 GMC Sierra 2500HD Denali Duramax that I traded up for the 2018. I averaged 16,000 miles a year in which I filled the DEF fluid tank once in the spring and once in the fall. Thanks again for the reply. Ray

 

Your owners manual for your 15 said the same thing. Why so uneasy about the 18?

 

If it worked for you on your 15 it will work the same on the 18.

 

Good to know...... That timing worked out good for me do to our winters.

 

I was largely in the same boat with respect to short commutes. For the most part the regens managed to finish but would carry on over several trips. It has warned me to continue driving on a couple of occasions though, which I did just to allow the regen to complete. So much for a reduced carbon footprint.

 

It's a shame that you have to go out and waste fuel, add mileage, add maintenance, take the time, etc. for this. I wish I was told about this prior to purchasing. It may or may not be a problem, I'll have to wait and see. I might add, the cleaning message came on today at only 90 miles on the truck when my wife was pulling in the driveway.

 

its no different then your 2015,if you don't need a diesel truck,go buy a 1500 gas truck

 

Never had a DPF Message, warning and/or caution on my 2015. DEF, yes. After 51,000 miles on my 2015, I would say I know about what messages I received. As far as your smart A.. remark, you don't know what I need or don't need. I'm not here to argue with anyone. I simply didn't know about the DPF, this is NEW to me.

 

You’re over reacting


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Your 2015 also had a DPF, they have been on since the LMM came out in late 2007. They have had the same requirements since the beginning, if your typical driving didn't allow the DPF to properly complete a regeneration you would get a message in the DIC to drive it to allow completion. If you didn't do this then ultimately a service regen would have to be performed by the dealer.

The 2018 DPF works just like the 2015 DPF except on average it should take less time to complete a regen so you would be even less likely to get the "drive to clean" message on the 2018 than the 2015.

 

Whoa! You read the manual. Shame on you

Your new truck has the components revised and relocated in the exhaust stream so that "regeneration events" will take less time per event and, theoretically, occur less often than once a tankful.

As for the "if I would've known" noz: , all current production, on road diesel equipped, vehicles have a diesel particulate filter, and a similar, if not identical, strategy for operation. As stated above, if you've never had to 30 minute drive your 2015, odds are that you'll never have to see that message on your 2018.

 

if you had a 2015 DURAMAX you had DPF and DEF fluid,and you had to fill it,DPF is the filter,its the same truck[I know the engs diff]

 

Thanks for the replies...... It appears that my concerns are not really something to be worried about since my 2015 was the same. I purchased the 2015 new and never had a DPF message. Having the 2018 for only a couple days with the DPF message coming on with only 90 miles on the odometer concerned me. Looking this up in the manual which stated self cleaning occurs approx. every tank of fuel surprised me to say the least. This is all new to me in which I was obviously oblivious to. I'm probably just over reacting and need drive as I normally do. Thank's to those of you that helped explain the DPF. :thumb:

 

To further put your mind at ease, the Duramax supplement on your 2015 has the exact same language as your new truck. That language has been in the Duramax supplement since the DPF was added on the LMMs.

 

and to think there is an attempt at a class action lawsuit saying that GM emission systems dont work, while We drive around complaining that they work to often.

 

The new regen intervals are much shorter then those intervals in your 2015 so in my mind you are even less likely to see the keep driving message. More or less it takes 12 to 14 miles to complete the cycle. The interval seems to have settled around 350 to 400 miles on my truck and unfortunately my truck rarely sees highway mileage for more than say 60 miles unless I'm going camping.

 

Thanks for the great info...... I'm believe with short trips and a lot of idling since this truck hit the dealer lot is the culprit. With your comment and others here, my mind is at ease. Thanks again, Ray :thumb:

 

Ray,

Thank you for posting your experiences with your 2018. I am preparing to order a 2018 and it will be my first DPF equipped diesel replacing my 2006 LBZ which like my 2001 LB7 has been very good to me.

 

You're quit welcome...... This is my 3'rd Duramax and obviously I'm still learning. My 2012 and 2015 Duramax's were awesome. This new 2018 even looks to be better. After reading this post, you can see I was purely over reacting about the DPF. The people on this forum are awesome! Receiving information from real world Duramax owners couldn't be any better. I'm sure you're gonna love the new 2018 and congrats...... :coolnana:

 

OK........ Took the truck for a drive on the E-way to clean up the DPF. Message disappeared after 26 miles. I also got back my normal DIC. I also checked the hours and idle time in the DIC when I got home which stated the following;
Engine Hours: 6.2
Idle Hours: 2.7
I now have a grand total of 134 miles on the truck.
I.M.O. along with most of you here, I believe the idling which was just shy of 1/2 the engine hours along with short runs was the problem. Thanks goes out to all of you for setting me straight on the PDF. You're awesome and that's why I love this forum. Ray :thankyou2

 

great to hear it finished ''regening'',now go enjoy it,and quit worring about it,its just like you 2015 only 100x's better engine and trans


good luck

 

Thanks....... I'm really loving it and my mind is at ease. :thumb:

 

My 2017 is regening around every 202 miles well below the 36 gallons or 5some miles.

 

Ive seem my 17 regen at 200 miles when on short trips or lots of idle as well as 700 miles when pulling a trailer.

 

Regen frequency is completely dependent upon driving conditions, anything that creates a high soot output from the engine means soot being collected by the DPF. Stop and go driving, particularly with hard acceleration, will result in very frequent regens. For those of us who owned "pre-emissions" diesel engines we are used to what created black clouds and those driving events are the same things that will cause rapid DPF loading in highly emissions controlled engines.

I will soon be trading my faithful 2006 LBZ in on a 2018. The 2006 is my second Duramax and besides some great memories of many father daughter camping trips with my now 13 year old daughter I will also sometimes miss its ability to create a little smoke. Although I am generally very bicycle friendly several years ago I was stuck at the head of the line behind a bicycle rider on Little River Road on the TN side of the Great Smoky mountains national park. Those of you familiar with this beautiful road which runs from Gatlinburg to Cade's Cove know that it is extremely curvy with very limited passing zones but many pullouts which are used by slow moving RVs to allow other traffic to move on. The bicycle rider used the very center of the lane and refused to pull over even though there were vehicles lined up behind us as far as you could see in an under 10 MPH parade. Constant heavy traffic in the opposing lane and a lack of any plausible passing place kept me trapped for 4 miles and when a passing zone finally opened up near the Metcalf Bottoms picnic area I left the rider trapped in a satisfying thick cloud of smoke that only a LBZ doing a full throttle acceleration from 8 MPH can provide With a DPF I would have been well on my way to the next regen with that single acceleration event.

 

Although I am generally very bicycle friendly several years ago I was stuck at the head of the line behind a bicycle rider on Little River Road on the TN side of the Great Smoky mountains national park. Those of you familiar with this beautiful road which runs from Gatlinburg to Cade's Cove know that it is extremely curvy with very limited passing zones but many pullouts which are used by slow moving RVs to allow other traffic to move on. The bicycle rider used the very center of the lane and refused to pull over even though there were vehicles lined up behind us as far as you could see in an under 10 MPH parade. Constant heavy traffic in the opposing lane and a lack of any plausible passing place kept me trapped for 4 miles and when a passing zone finally opened up near the Metcalf Bottoms picnic area I left the rider trapped in a satisfying thick cloud of smoke that only a LBZ doing a full throttle acceleration from 8 MPH can provide With a DPF I would have been well on my way to the next regen with that single acceleration event.

Ahhh...... Yes........ Cades Cove...... Awesome 11 mile loop in the Smoky's. Been through the same type of experience with bicycle riders. I don't mind them using the loop but, it would be nice if they yielded to traffic courteously as the majority of them do. I believe Wednesdays is a designated day for bicyclist in a certain time period. Been going there for well over 20 years...... Its not kept up quite as nice as it use to be but, it remains to be one of my favorite rides. I'm sure DNR and/or maintenance cutbacks is the problem.

 

My 2017 had a message to drive to complete the process message when it had only 200 miles on it. I never saw that message on my 2011 or 2015 LML’s. I have about 600 miles on it now and hoping it was just due to some excessive idleing at the dealer.

 

Same here....... I was totally oblivious about the DPF on my 2012 and 2015. Thanks to all of you, I became educated very fast. A huge THANKS, Ray :thankyou2

 

It wouldn't have been bad if it had been on the actual Cades Cove loop but this was on Little River Road about 10 miles from the Cove loop where the speed limit is 35 MPH.

Beautiful drive..... 35mph and with an unforgiving bicyclist, he/she wasn't too bright.

You are absolutely correct about the lack of National Park funding which has been going on for over two decades now and the results are really showing in many areas.

Truly a shame....... As you, it's always been and still is a go to place when in the Smokies.

I have also been going to the Great Smokies area for many years and it is my favorite area of the country. The only time the Cades Cove loop becomes annoying for me is when people create a huge traffic jam when a deer shows up and walks across a meadow. I have to keep reminding myself that in many areas of the country people never see deer but around here they are about as common as crows and squirrels. I have been fortunate never to hit one with a car or truck but I ran into a doe while running late one afternoon (she popped out of a roadside ditch and I pushed off of her shoulder to avoid running into her). Thinking a running contact with a deer would never happen again I didn't worry but two years later one came flying out of a field of seed corn while I was running by and knocked me down since I only partially avoided her. No harm done and again I was happy to be on foot rather than driving; probably a family member of the first doe seeking revenge for my earlier contact

Living in Michigan all my life, I know where you're coming from. I've been "extremely lucky" not to hit a deer. I came close a few times but, no strike.

I believe you're gonna love the 2018. I only have under 200 miles on mine and can't wait to climb inside to put some real miles on it. The feel and looks I.M.O. is much better than my 2012 and 2015 was. My biggest problem was choosing between the Quartz Red or Quicksilver. Ended up with the Quicksilver due to the Michigan environment showing dirt, etc..... and of course how great it looks. My 2012 was black in which I couldn't keep up with it. Enjoy your new 2018 once you get it. :thumb:

 

Hi Ray,

I drive a 2015 LML at work and get about 5-7k on a tank of DEF fluid. My 17 appears to use about one gallon every 700 miles or so. So be prepared to add a bit more DEF fluid. Also, don't be too surprised if the dealer didn't totally fill the DEF tank.

 

My experience is that the dealer only fills until they get the "OK" DIC message. Another reason, I.M.O. there should be a gauge showing DEF levels.

 

They probably roll off the truck with the OK message...

 

Hook up your trailer and take it for a good ride. That original huge idle time that you quoted before may have this thing all goofed up. Go a solid 150 miles or so with the trailer. Yes it will waste some fuel but try it.

I wouldn't let the trucks idle that long DPF or not. That is a huge waste of fuel! Mine is warm in 5 minutes at 10 degrees. I idle it for maybe 2 minutes and drive. Heated seats, steering wheel and the heat comes up real fast. I am also going to run the winter cover from December through February to keep it nice and toasty and help with keeping soot down.

 

With my Duramax diesels for a cold start I have always idled just long enough after start to where the voltmeter starts to come upscale indicating that the intake grid heater has shut off; the intake heater continues to operate a short time after cold start to reduce emissions and you will notice the first jump up in voltage when it shuts off. There is nothing magical about letting it shut off before normal vehicle operation but for me it makes a convenient timer (usually around 1 minute) to let it operate before going into gear and driving normally.

The cold high idle option is mainly for engine protection and not owner convenience; operating the engine under light driving load shortly after start is still the best way to warm up the engine. Extensive idling with a very cold diesel engine is bad for the engine (incomplete combustion results in oil dilution and "wet stacking" where raw fuel builds up with a dirty burn in the cold exhaust system). The increased cold idle is designed to combat the incomplete combustion problem by increasing idle speed and increasing engine load via transmission loading and exhaust restriction via the variable exhaust vanes on the turbo which definitely beats a standard unloaded cold idle but it is still a poor substitute for normal driving to warm the powertrain.

For cold weather operation using the grill cover when appropriate (cold temps, non-towing) and the block heater increases operating efficiency and reduces soot loading. About 1 minute of idle before going into gear for a cold start is plenty, just drive moderately until engine begins to come up to normal temperature. For a hot restart a few seconds is sufficient.

With my gas powered Cadillac ATS and Corvette Z06 on cold start I use the remote starter when approaching the car and by the time I am belted in place the engine has dropped to base idle and is ready to go. The Z06 gets driven gently until the oil temperature comes up to 160; with these vehicles GM shows a reduced redline on the LCD tach display for cold engines that gradually increases from 3,500 to 6,600 as the engine warms up but I prefer to use oil temperature which is a more conservative approach and it takes some time for the 10 quarts in the Z06 dry sump system to reach a good operating temperature. For my Dmax I use the oil pressure dropping to normal levels as a good indication that the oil is up to operating temp.

Extensive cold idling is not good for any engine and you will see this reflected via the GM OLM system which will show a rapid drop in remaining oil life if you do extensive idling and short trip operation in below freezing weather. Driving the vehicle to get it up to normal operating is the way to go, just avoid high throttle and high RPM operation while it is warming up.

 

Great information....... I do agree with everything especially letting the truck warm up too long. Normally, 2 to 5 minutes is plenty. I never jump into a cold (engine) truck and take off......... Maybe it's the old school in me but, believe it's wise to do so.

OK..... Took the truck to the service department this morning which is 12 miles away from me. The DPF message was still on. I came across this other thread found at the Duramax forum "link below" on pg. 8 post #75. I checked the intercooler charge pipe going into your throttle body and I was able to move it back & forth slightly. I let service know about it along with the TSB that was put out on the 2017's. I'm suppose to get it back late today........ we'll see. I'll keep everyone here posted.
Thanks to all once again, Ray opcorn:

LP5 Regen Interval - Page 8 - Chevy and GMC Duramax Diesel Forum

 

Got the truck back but......... After approx. 7 hours in the service department yesterday, I received a phone call stating that they couldn't find a problem with the exception of the DEF being low. I'm not sure how they determined that since the DIC always gave an "OK" message. I was told they added 5 qt's of DEF. As for the intercooler charge pipe going into your throttle body, they stated that it was tight. I then stressed the point that I checked it in which it wasn't. The service manager pulled the TSB for the DPF which is now showing 2017 & 2018's. Today, after another 5 hours, he had the mechanic go over all of the charge pipe plumbing for proper adjustment and tightness. In addition, they did a force DPF regeneration and couldn't find anything wrong.
Now it's a wait and see game to see when the DPF wants to regenerate. At the very least I have all of this documented.:bat:

 

:shake:
I really hope it works out for you and the other guys. It shouldn't be that way, you buy a new truck and have all kinds of issues with it. GM needs to get their act together, I would like to have a new truck but until they figure out the problems, I will just drive my 2006 LBZ that has right at 80,000 miles on it.