2020 Silverado 1500 Duramax - 1st Check Engine Light (Part 2 of ??) 

How much is for the entire Def ? Did u saw in the paper ? I know was under warranty

Chad let us in on your secret?

Did u bought the truck ? U can get 22 city and when is regen u need to continue driving

Aaron, Owning a diesel does come with a set of different opportunities. The emissions systems on all diesel engines are very similar so it won't matter if you go with a GM/Ford/Ram they all could have similar issues. Depending on if you live in the north or farther to the south some of these items might not ever show up. My testing has shown that if the temperature is always above 36F then this heater will never come on and you would never see this message. I had a Colorado 2.8 Duramax and really enjoyed it, great MPG and can tow... As for the Hybrid F150, I don't see the point of that combination, not very good MPG on the highway and only a little better in the City if you can get it. Towing the MPG is going to suck. I would suggest you get the Chevrolet with the Duramax, awesome MPG on the Highway, good city MPG and really good MPG while towing too... Thanks for the questions and for watching, stay tuned...

Ralph, Thank you so much for the information on the TECHLINK article. My DEF heater has not failed again since this video was shot but in the TECHLINK it stated that the tank needed to be more than 50% full, EFILive says it's ~54% full... I'm going to go and fill up the tank today and see if my problem is the leaking/short or if there is something else going on. Thanks again for the heads up and for watching. I really appreciate it.

I have had DEF related CEL(s) since new, I now have ~4K miles and have had at least 4 CEL at the dealership, they just replaced the following parts: 84914535 tank, 84620945 harness, 84714454 controller, and 3 1/2 gallons of DEF fluid. My issues began when new from the factory when the same dealer said that the DEF pump connector pins were wired wrong! I hope this resolves my DEF problems as I plan on some long road trips this summer and I really want to enjoy the truck but I'm losing all hope of it being repaired correctly, which is a shame because I love the drivetrain of this truck.

Ralph, thanks for the information. The more I think about this critical emissions system I would be willing to pay an extra $500 to have some redundant parts so that if one fails a 2nd one can take over till you get time to get it fixed. Things like the heater, pump and even the injector.. If you don't mind, keep me posted if that did fix your issues.

@@CJIEngineering Chad, I will keep you posted good or bad, give me a few weeks and I'll let you know! Thanks

No it does not. The plug only warms the block. There are two DC heaters inside the tank that turn on when the temperature is less than 45F. I hope this helps.

I'm getting a CAN interface that will work with Wireshark, a program that allows you to record traffic on different buses. I have used it for USB and Ethernet in the past. Pretty useful so I'm hoping it will help with CAN also.

@@CJIEngineering If you're a Wireshark user, you're more than just a farmer. ;) Like your content!

Ken, sorry to hear about your check engine light. I really can't say why it might be coming on, there are probably 1000 or more reasons why. I recommend OBDLink MX+ adapter or purchasing the Banks iDash. The iDash is about double the price but it works great. I bought the one that allows you to log the parameters to a micro SD card, and additional cost but I like to review the data... Purely a nice to have but not required. Let me know what you find out. Thanks

@@CJIEngineering Hi Chad thanks for the reply. The dealer replaced the nox sensor (no charge) and the engine light is gone, time will tell if it was the only culprit….I am going to investigate your suggestions, I am a maintenance nerd and not satisfied with the vague info that GM provides, thanks for the advice.

One more question (sorry) I see the mx + comes with its own app. Is it a decent app rendering the torque pro redundant?

@@LakeJoe I have not used the App that comes with the MX+. I would recommend TORQUE Pro since I know you can add additional PIDs, I have a Google sheet with some that I have found that are very useful. I think the cost is less than $10. Let me know if you have any problems

@@CJIEngineering Thanks very much for the advice.

Mine never came back. I still haven't found the PID values for those 2 heaters in the tank but I did buy some more tools to evaluate the CAN bus and now that my truck is almost out of the 36k warranty it's going to open season on debugging these things. Did you have the message when the fluid temperature was over 45F? If so then it sounds like a wiring issue. My heaters don't come on unless we are kinda cold so all spring/summer it has been good and the fall has been pretty warm so far.

Yes, the DEF heater only runs when the temperature is under 45F. Once the DEF is above that temperature the heaters stop and cycle as necessary...

I have do a lot of towing. 16mpg is what I get towing my 20" deck over trailer empty, 14mpg when I have a load of hay or a tractor on it. It has also been cold so I let it warm up using the remote start so that take a little toll on my mpg also. Around town I'm getting 21, on the highway around 27. Thanks for the question and for watching.

100% agree. There is a service builtin about a potential issue with DEF getting into the heater. I have not had another CEL since the first one so I'm trying to see what else I can figure out about the whole system. Thanks for the comment and for watching.

@Kenn A. Sorry to hear about your check engine light on such a new vehicle. The dealership should be able to get you fixed up but if it were my truck I would try to put a few more miles on it before I would take it in. Get it out on the highway and up to temperature for at least 15-20 minutes to see if the NOx #2 sensor is really working or not. The whole system must be in perfect condition or the EPA, under the current rules, requires that we get it fixed within 175miles or so.... That is way too aggressive in my opinion but the OEMs are required to follow the rules and we as truck owners need to push back on the EPA to make the rules more reasonable. I've had a couple of issues lately and all I wanted to do was just finish my trip without having to rent a truck and go back 2 weeks later to pick it up...... More on that to come. Please keep me posted on what you find out.

@@CJIEngineering sorry to hear about your troubles on your trip. Definitely understand the frustration and I agree on the rules and pushing back. I’m actually headed into the dealership at 0930 this morning to investigate the error code. On the first day of purchase I did actually drive it an hour to my house but it was back country roads so still was not able to open it up more than about 55 mph… will keep you posted…

Sorry to hear about that code. A couple of questions, has it been below freezing lately? How full is you DEF tank? One simple thing to do would be to fill up the DEF tank so it is 100% full and drive the truck for 8-10 miles to see if the light goes away. The EPA has really limited our use of the truck/engine if there is even a slight chance the engine won't be 100% clean. It's really been bugging me lately. Way too much interference from our government, IMO

It was about 17 degrees down here in Ohio when this light came one. The def tank was filled about 100-200 miles ago, still showing full on the indicator. Today was warmer like 25 ish and the check engine light went off and no longer display the 165 miles until 65mph max speed. Can’t get an appointment until next week.

I hate to say that they probably won't be able to find a problem when you bring it in. There is a really good chance that there was just a small disruption in the flow of DEF to the injector, possibly frozen. DEF isn't supposed to freeze till 11F but that is if it's well mixed. Where do you buy your DEF? Old DEF is more likely to cause issues. DEF in the 2.5 gal jugs have date codes on them and you want to make sure it's as new as possible, 1 year is the oldest you would ever want to buy. I use a lot towing and buy it from a truck stop pump so it never very old. Let me know how it goes if you don't mind.

@@CJIEngineering I bought the peak def from Meijers. Didn’t really check the date code on it. I have gotten it from the gas station straight from the pump before but not this time, i have a feeling your right about them not finding anything just hate to be down the road towing my camper and something going wrong, and most importantly being out of warranty! Try and keep you updated

It's at about 1qt every 4,000 miles when not towing. My last long trip it was 1qt every 2,500 miles while towing the whole time.

@@CJIEngineering is that normal or will it slow down after more miles or break in

I have 23000 on mine highway driving and in 1200 miles it used 1/2 qrt

I have about 21000 miles on my 2020 Silverado 3.0L Duramax and haven't had to add any oil by each of the three oil changes so far. I've sent in oil for testing at Blackstone Labs (thanks Ivan for that tip). Blackstone reports the oil is in great shape at the 7500 mile change interval and could go 9000 miles or more. But I'm not sure about extending the oil change interval or GM might try to void a warranty someday.

Wow, sorry to hear about that. Did it get fixed pretty quickly?

@@CJIEngineering yea it was all covered the part was out of stock across the country took a week bits it’s running great now

I have same problem now. Part out of stock

Nice troll

Prob didbt pass any gas stations with that 5.3 pig

Same here!

I have not seen that there are any new updates for the firmware. Since it has not happened again the dealership is just going to send me away till we capture it again :(. I'll keep looking for possible reasons and possible updates.

Yes, they do. BTW, the 2.8L baby Duramax has cold issues as well. This electrical engineer believes these new smaller GM diesels are being rushed to market without proper cold testing being accomplished. Too many deep-cold, freezing-related issues are surfacing. The poster's is not an isolated occurrence. I wonder if the smaller Ford 3.0L diesel or the Ram 1500 EcoDiesel power-plants are having similar issues?

@@steveg5524 I always wait until second generation of any new motor or transmission. Ford has been having major issues with the new 7.3l gas motor and new 10sp transmission as well. 🤦‍♂️

@@steveg5524 maybe that’s why Ford just discontinued the baby powerstroke as of the end of July 2020