Truck is still running great with no CEL issues. I do still have the “muffled Jake brake” noise when coasting down at low speeds. Not sure if it’s normal for all 3.0 trucks See my first post for all the parts the dealership replaced to clear my CEL.
6k miles and still have the noise, normal for my truck, check my other posts about my DEF system. Dealership replaced the entire DEF tank, pump, heater and wiring harness, seems to work now. Towed 4K lbs. 300 miles last Sunday and the truck towed great and even downshifted in tow/haul with cruise control on down a long grade at 50 MPH! Very happy with the truck now if I can stay out of the dealership!! !
I will be following this closely as my truck started making noise last Friday on our first warm day. We went on a 120 mile round trip it was 75 degrees, I noticed the jungles soon after the truck was warmed up and didn’t say a word to my wife. I wear hearing aids and couldn’t determine the source but on the return trip my wife asked what the noise was...and my truck only has less than 5K miles! So on the next warm day this week I will try the 4WD mode to see if that changes the noise. I'm so happy I saw this as I knew the dealer wouldn’t of been able to confirm any noise, hopefully GM can f
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.
Thanks guys for your help...I have contacted both Titan and TransferFlow through their website's contact links. Both haven't responded yet, I don't want to spend time and money to find out I may have installation or operational issues ie: the emission system CEL that my truck seems to have enough of on it's own. So I'm still looking for someone who has installed a auxiary diesel LM2 tank and what they have had for results in our T1 1500 series trucks. Thanks again, Ralph
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
Interesting... My truck threw a CEL this week (emission message, 160 miles until limited speed 65 MPH) this was the second time in 800 miles and my truck only has 3800 miles on it. I have had 5 CEL since new three times in the dealership, the other two cleared after second or third ignition cycles. The first time was during the test drive with only 55 miles on the odometer! Every time the dealer said it was the emission system related to the DEF system, DEF tank heaters and now the pump. This week the service manager said they had to order parts i.e. a coolant? pump, hoses, and a contro
Strange story but I'll break it down and make it as simple as I can... Bought my new 2020 Duramax back in April, during the test drive at the dealership I noticed a CEL and pointed it out to my salesman. The Dealership cleared the CEL before delivery (55 miles on the odometer) and the repair order said they replaced the "Emission Reduction Fluid Tank" because the reductant heater 3 current was high scan code: P221F. Fast forward to 2400 miles, After mixed driving and towing maybe 200 miles of towing total I noticed two things about my 3.0 Duramax, first the engine always made a mu
When my truck was brand new I backed up to my trailer and tried this feature highlighted in red. I ready liked it at the time and thought the GM Engineers ready did a great job designing the software, but now I can't seem to make this feature work? The dealer said its working at designed?? Has anyone else tried or had issues with useful feature? When I backup now with the "hitch view" camera and shift into park, I roll back an inch or so unless I manually engage the parking brake. My question is for anyone that owns a 2020 Silverado LT this highlighted text was copied and pasted from
What kind of Highway MPG do you get with the 3.73 gears? Most others that are getting 30 MPG highway unloaded have the 3.23 gears like mine. I think your truck has the "diesel off-road" package? Thanks
If you encounter any down hill grades while towing please try the exhaust brake with TH and cruise control and no cruise control. TFL had poor results with this test and I would like to see if other driving techniques would help engage the exhaust brake sooner? Thanks.
I have the same question...I'm thinking about getting my truck in to be checked because according to my DEF gauge I have a full DEF tank since new with about 3K with a little towing. Seems like everyone uses a lot more DEF after the update?
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