2018GMC
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Posts posted by 2018GMC
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On 5/21/2023 at 7:01 AM, Homewrecker007 said:
Well the dealership ordered a new radiator and radio screen both covered under warranty. As for the oil situation. They started an oil consumption test which may take forever to complete. I have to bring it back after 500 miles for them to check and record the oil levels then again after another 1000 then another 500. So far I've got 260 miles down before I had to park it and go to work out of state for the next month
If you are having odd electrical issues, check all your grounds.
engine ground on firewall
negative cable ground near edge of passenger fender liner
chassis ground under driver seat under truck near frame rail-
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On 5/13/2023 at 1:08 PM, Gagliano7 said:
So far my 10 speed has been flawless. I was surprised that the 5.0 10 speed 3:73 gears would be close to the same as my 18 gmc 6.2 8 speed. Maybe they are close to the same in the 1/4 mile but having driven them back to back the you can feel the torque difference with the gmc being superior and when you decide to pass someone the gmc has the edge. The f150 has been great so far but I must admit I miss my gmc.
suprised you found a v8 5.0 vs the v6 ecoboost. I thought most dealers carry the ecoboost and the 5.0 is kind of hard to find. Thanks for the comparison and keep us updated on how the f150 treats you. Pics? I bet a tune would wake the 5.0 up but of course that’s at your own risk. 5star tuning specializes in Ford where blackbear tunes GM -
The directions say to use their pre-mist spray for tough stains...
Pre-mist spray
https://www.amazon.com/Capture-Carpet-Cleaner-Release-Pre-Mist/dp/B07SS2B7QV
Capture Powder 4lb
https://www.amazon.com/Capture-Carpet-Rug-Cleaner-Resealable/dp/B01MS4I0H2 -
Picked up this suburban cheap from a friend. He didn't care much about the interior and there were a lot of stains on the carpet. I was able to get some of them out with water and shampoo but the red fruit punch spill remains.
I agree that taking the carpet out for deep cleaning is the best method. I've shampooed other vehicles without issue but apparently the suburban has some modules under the carpet or some chaffed wires that got wet.
I've left it in the sun with doors open and carpet is almost completely dry, still a bit damp in a few spots.
Drove it around town yesterday and no issues. -
Fixed! Moral of story, careful on how much water you use cleaning suburban Yukon Tahoe carpet. Remove door sill covers and vacuum up water that collects there. Raised front of vehicle to help water drain to rear and door sill channels. Leave battery disconnected until it dries out.
After raising front of truck on jack stands maxed out and rear still on ground I removed all the door sill plates and vacuumed up water as most of the water collected in the door sills that had alot of wires in the door sill channels. Also saw some water dripping from underneath after raising front end. Letting it sit like this for 2 hours with doors open and battery disconnected, I hooked battery back up and it started up, said driver 1 on DIC. Radio , windows, dome lights, all gauges work again. Cleared a lot of codes. They haven’t come back except the prior 3 I’ve always had.
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Was cleaning the carpets in 2003 suburban Z71. All seemed fine until I tried to start the truck. I get unknown driver, no gauges, no radio, no power windows. Tried disconnecting battery and checked all fuses under hood and driver side fuse panel. All are good. Pulled up all the door sill plastic and vacuumed up water that was sitting in there where wires are running. After this it now starts and runs but all sorts of electrical gremlins. I went over the carpet again but it is still damp.
Where are the ECM, BCM, ABS, Airbag, Driver / seat and any other computer modules located? I thought most were up under the passenger dash.
For now I unhooked battery and opened all doors to let it dry out.
When it did start, It displayed "Driver 2" Everything worked for a few minutes then gauges died and so did windows, radio, dome lights, etc. -
Realized my slightly discolored black leather spots are due to a family members over application of sun screen. I’ve gotten most of the white sunscreen out but still a noticeable spot. Not sure what cleaner to use that won’t further damage the fake leather.
Your discolored spots could be due to lotion or sunscreen transfer.
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Mine are peeling worse than that since day 1. Showed dealer and they said they could fix but would have to pull bed. I declined.
Besides looking like they will fall off mine are still there 5 years later
driver side is worse than passenger
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On 1/19/2023 at 8:08 AM, Alex Olsen said:
I have a 2014 Sierra slt z71 with the stock rancheros.
right now I have a 2 inch level spacer and the ride height looks perfect. However it rides pretty bad. I’m assuming it’s a lot to do with my stock shocks being at 100k but whenever I am off-road and I hit many consecutive small bumps my front end starts to bounce uncontrollably. Feels like the front end bottoms out and wheels leave the ground. Not sure if I need more travel or just better shocks.
sounds like the 5100s are the way to go. If I wanted best ride possible should I ditch the spacer and max the 5100s lift.have the 5100 stock height with spacer. Or even somewhere in the middle and have like a 1 inch spacer on a middle lift setting on shocks. Not sure if this is a travel issue or a shock issue so would like some input on this.
I run the 5100's at max height and gained 2.25" of front lift. Do not run a spacer with the 5100's. Rides firmer than stock but still comfortable and very controlled.
Your frontend is bouncing uncontrollably because you have no down travel. AKA when the wheels need to travel down after the suspension is compressed, they can't because you have the frontend maxed at maximum expansion.-
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I used to get service stabilitrak on startup every few months. I don't offroad much but our highways around here are rough enough to qualify. Never gotten the message driving. Have you checked for any codes and checked all your grounds?
G218 ground shouldn't be an issue on a 2018. I would occasionally get service stabillitrack on startup but thats it. Check and clean all your grounds, especially the engine ground to body.
There are 3 frame grounds:
1. under driver seat on frame
2. behind front passenger wheel well
3. on top of spare tire by trailer tow package.Your negative battery cable may have high resistance and need replaced. Dealer replaced mine and it didn't really change anything but they said it was out of spec for resistance.
Here is the official Technical Service Bulletin TSB
https://static.nhtsa.gov/odi/tsbs/2019/MC-10168185-9999.pdf -
AC and floor hvac climate control buttons didn’t light up today. Guessing it’s a entire control lane not just replaceable lights?
5 years old and 21k miles. Lowest bidder for this part.
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AC and floor hvac climate control buttons didn’t light up today. Guessing it’s a entire control lane not just replaceable lights?
5 years old and 21k miles. Lowest bidder for this part.
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Anyone know If I can plug these into my factory radio and get the functionality or is there some interface module thats needed?
I have a 2018 GMC sierra with max tow package that came with the large towing mirrors
Echomaster mirror cameras
2015-2019 GM Silverado/Sierra Factory matched mirror caps blind spot cameras ! | eBay
Echomaster Front camera
https://www.ebay.com/itm/134161439353 -
Thanks for the info. Not very interested in the 6.2 and AWD Yukons. I do like the next gen of Yukon 2015+ those are starting to come down in price a bit but will have to wait it out and I’ll still keep my eye out for a 09 tahoe 6.2 which only came is SLT if you want 6.2
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I live at 7000' high altitude. I run 87 for daily driver use but put premium in when dropping down to lower altitudes and if going to tow. Never had a knock sensor code or heard any pinging / knocking.
Premium is .40 - .75 cents more per gallon vs regular 87 octane. Includes sams club. -
I considered upgrading to the GM Big brake kit offered on K2xx trucks. I recall you can run 18” wheels from T1XX truck /suv or a 20” wheel from K2xx truck. GM still puts a 17” steel spare tire on vehicles with big brakes from factory so if you get a flat on the front you need to move a wheel from the rear to front then put the 17” spare on the rear because it won’t clear the front big rotor / caliper.
Stock wheels on t1xx trucks have different offset to clear the larger calipers.
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6.2 L92 VS 6.2 L9H.
L92 2007-2008L9H 2009-2013
https://help.summitracing.com/app/answers/detail/a_id/4851/~/intro-to-the-l92%2C-l9h%2C-and-l94
Isn’t the L92 rated lower hp and torque vs the L9H? Thought the L92 was 380hp and L9H was 403hp. Main differences were cam and vvt phaser. L9H was flex fuel compatible. L92 not.
I’ve been looking for a 2009 Tahoe 4x4 with the 6.2 L9H but they are kinda rare since 6.2 was only offered that one year in Tahoe LTZ trim only. This one year config also came with larger rear axle and 6-speed auto.
http://www.automobilegt.com/Brochures/Chevrolet/2009_Chevrolet_Tahoe.pdfGMT900 Suburban never got the 6.2. Of course 2007-2013 Yukon and Yukon XL Denali and Escalade came standard with the 6.2 but they were AWD, no selectable 2wd, auto 4hi, 4lo transfer case.
Odd the brochure lists 6.0 available in half ton suburban. Don’t think it ever was except in the hybrid versions and the 2500.
These are getting cheap-ish as the years and miles pile on…
What years had valve spring failures or is it any year 6.2?
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If there was a dealership that had a service department that’s worth a $hit near me, I’d do the TSB but I’ve been to both the GMC and Chevrolet dealer and they both suck. Several hours for a oil change, they don’t call when it’s done. One of the dealers smashed my Evap canister using it as a jack point. Didn’t find out about that until weeks later when I got a check engine Evap small leak. Of course both denied responsibility.
So here I am doing it myself
The filter will get changed when I do the work and the pan cleaned since the dealer just hooks up the flush machine and then they’re done.
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21 hours ago, newdude said:
Get the right stuff. Do NOT use the multi-vehicle which when clearly looking at the compatibility chart for it covers Dexron 2, 3 and 6 only, NOT HP.
Only other compatible fluid I can find is Amsoil Signature Fuel Efficient ATF which is the most expensive at $18.69 per qt, $14.39 per qt if you buy the gallon and you are preferred customer. https://www.amsoil.com/p/signature-series-fuel-efficient-synthetic-automatic-transmission-fluid-atl/?code=ATLPK-EA
Looks like I'll prob be going with Mobil 1 LV Blue label 124715 for &7.36 per quart when you buy the 6 pack -
Looks like the Mobil 1 LV Blue label 124715 is $46 for a 6 pack on the jungle website. They have a pic of the old black label but several reviews say it is actually the Blue label 124715
Amazon.com: Mobil 1 Full Synthetic LV Automatic Transmission Fluid HP, 6-Pack of 1 quarts : Automotive
What about using Valvoline Multi-vehicle 773775?
Valvoline MaxLife Multi-Vehicle Full Synthetic Automatic Transmission Fluid (ATF) 1 GA - Walmart.com -
I'm thinking of doing a DIY at home flush on my 2018 6.2 with 8l90. Only has 20k on it and shifts great but have heard that the OEM fluid is hydroscopic and slowly absorbs water over time which causes shudder and shifting issues.
I'm betting I need 12 quarts to do the flush at home, possibly more if I want to change transfer case atf as well which holds 3 pints.
Looks like I could do this at home DIY flush in the driveway by:
1. Drop pan, remove old fluid and clean pan, replace filter.
2. Install pan and add 4 quarts of fluid.
3. Remove the cooler block, inserting some poly line in the cooler port on side of transmission towards front of vehicle.
4. Fill transmission with 4 quarts of new fluid.
5. Run engine for 45 - 30 seconds to flush torque converter. Repeat until fluid is clean coming out of poly line.
6. Blow cooler lines out with compressed air
7. Replace cooler lines onto side of transmission.
8. Fill with new fluid and check level.
8L90 flushing proceedure.pdf 8 Speed Fluid Level Check.pdf 8 Speed Fluid Fill Procedure.pdf 8 Speed Fluid Change.pdf
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On 10/6/2022 at 6:20 PM, Miguel Olea said:
Update! I've only driven the truck 5K miles since I had the service done. My buddy and I dropped the pan changed the filter and did a flush with 20 quarts of the new blue label Mobil 1 fluid. I also added 1 10oz bottle of the lubegard platinum to further protect against any shudder although I've never had that problem. The truck drives and shifts so much better which leads me to believe that GM had THE WRONG fluid in that flush machine. It probably had Dexron 6.
I'm thinking of doing a DIY at home flush on my 2018 6.2 with 8l90. Only has 20k on it and shifts great but have heard that the OEM fluid is hydroscopic and slowly absorbs water over time which causes shudder and shifting issues.
Looks like the Mobil 1 LV Blue label 124715 is $45 for a 6 pack on the jungle website.
I'm betting I need 12 quarts to do the flush at home, possibly more if i want to change transfer case atf as well which holds 3 pints.
After how many quarts did you notice the fluid coming out of the return line get cleaner?
Looks like I could do this at home DIY flush in the driveway by:
1. Drop pan, remove old fluid and clean pan, replace filter.
2. Install pan and add 4 quarts of fluid.
3. Remove the cooler block, inserting some poly line in the cooler port on side of transmission towards front of vehicle.
4. Fill transmission with 4 quarts of new fluid.
5. Run engine for 45 - 30 seconds to flush torque converter. Repeat until fluid is clean coming out of poly line.
6. Blow cooler lines out with compressed air
7. Replace cooler lines onto side of transmission.
8. Fill with new fluid and check level. -
On 5/31/2022 at 12:51 PM, Gangly said:
Attached in PDF format is how they flush the fluid. A simple drain and refill is a different procedure.
Looks like I could do this at home DIY flush in the driveway by:
1. Drop pan, remove old fluid and clean pan, replace filter.
2. Install pan and add 4 quarts of fluid.
3. Remove the cooler block, inserting some poly line in the cooler port on side of transmission towards front of vehicle.
4. Fill transmission with 4 quarts of new fluid.
5. Run engine for 45 - 30 seconds to flush torque converter. Repeat until fluid is clean coming out of poly line.
6. Blow cooler lines out with compressed air
7. Replace cooler lines onto side of transmission.
8. Fill with new fluid and check level.
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21 hours ago, Sal2018 z71 said:
Hello did you ever figure it out? I’m having the same issues on my 2018 Silverado 1500
G218 ground shouldn't be an issue on a 2018. I would occasionally get service stabillitrack on startup but thats it. Check and clean all your grounds, especially the engine ground to body.
There are 3 frame grounds:
1. under driver seat on frame
2. behind front passenger wheel well
3. on top of spare tire by trailer tow package.
Your negative battery cable may have high resistance and need replaced. Dealer replaced mine and it didn't really change anything but they said it was out of spec for resistance.
Here is the official Technical Service Bulletin TSB
18-NA-161 1..7 (nhtsa.gov)
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Happy Memorial Day Weekend
in 2014 - 2019 Silverado & Sierra
Posted
Reviving this tread in 2023
Happy Memorial Day eveyone!