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Well I had a CEL (P0234 Code Turbo Boost) a couple of months back on my 2021 Sierra 1500 Elevation with the LM2, and it took that long to get it into the dealer. Just got the call that the turbo bearings are going out and it needs a new turbo. This at 26K and change. Thank God it is under...

...so no permanent fix for the ECNS issue? I just had it happen to me again yesterday on my '21 LM2 with ~22k on the clock. Second time in a couple of months and maybe the 5th time since I purchased the truck new. Always starts right back up on 2nd try. Sounds like the reflash does nothing...

https://jalopnik.com/cadillac-escalade-diesel-accidentally-filled-gasoline-1849756907

UPDATE: It seems that the dealer was correct as the glitch seems to have gone away on its own. Still, when one pays $60K plus for a new vehicle I would like to think the designers and engineers know what the hell they are doing...

I just got the DEF warning that the tank was empty and I had 500 miles to reduced speed of 65 MPH. Plus the warning light on the dash. My DEF tank is full. Anyone have this issue that can shed some light? Hate to take it to the local dealer as they suck and take forever. Edit Called dealer and...

Mooseman: Diesel in my neck of the woods (No. Nevada) has always been cheaper than gas. We just returned a few weeks ago from a 2700 mile trip pulling the trailer to Glacier NP. Imagine my surprise that ebverywhere we went, gas was considerably cheaper than diesel. Home now and diesel hese is...

My next door neighbor has similar issues on his '21 Denali. They were traveling in Roseburg, OR, when dash lit up and went into limp mode at ~28K miles. Took it to local dealer and was told the wiring harness has 2 branches - 12V and a 5V. His issue turned out to be the wiring harness was routed...

Update I ust returned last night from a 2650 mile trip to Glacier NP. The truck was flawless - no code - and I got 15.1 MPG pulling my 22' Rockwood Mini Lite trailer. I love this truck. I DID use a fair amount of DEF, however!

jjs34748 I know that service writers are just that: service writers. But to lie to my face is unethical and just plain bad business. If he wasn't sure he should have said so and then checked with his tech. Also I was told that to throw this code the overboost has to happpen twice - but of course...

Yesterday I went and talked to the service writer who I originally spoke to at my local dealer and he assured me that the code would still be in the computer, so this morning my wife and I took separate cars and drove 2 hours for the dealer appointment in Placerville, CA. Since we had driven so...

Update: I replaced the drain plug with the new one that was sent to me. So far, no more leaks! Update It's been a couple of weeks and a few hunred miles. Still no leaks.

Well I got an appointment in 2 days time at a dealer in Placerville, CA which is 2 hours from me. we willl see what they find out...

gemarsh: Yes, they cleared the code and it has not returned. I did a few hard accelerations and so far so good. It has been a couple of days so far and I have been driving it every chance I get and again, so far so good. Truck never faltered with the CEL lit and still runs great. Gonna drive it...

So my 2021 GMC Sierra 1500 LM2 jusst thew a check engine light. Took it to dealer and was told "turbo overboost code". Can't even have it looked at for a month they are so busy which sucks because the wife and I had a trip planned to pull our trailer to Glacier National Park in about 3 weeks...

Just as an update. I emailed Stahlbus through their website to let them know of my dissatisfaction with my leaking oil change valve. On the next business day I recieved a call from the owner of the company and he told me he hates to have unhappy customers and will be sending me a new valve. He...

The ValvoMax website lists the M12 1.75 for the LM2

I have always used a Stahlbus oil change valve. Used them on my last 3 vehicles. I just now finished writing Stahlbus USA an email complaining about how my current Stahlbus constantly leaks from the ball valve. Getting pretty tired of oil drips in the garage and driveway - especially for a new...

I found what was leaking. I had a quart of Dexos D oil in the pocket of the back door and somehow the cap came loose and was dripping down from the door panel onto the rocker panel...LOL That's why it looked like clean oil ... it WAS clean oil!

Smells like clean oil...clear(ish) in color, viscous...

Just returned from a 1500 mile trip to the Grand Canyon towing my Mini Lite Travel Trailer with my 2021 Elevation LM2. This morning I noticed a rather large oil puddle on the garage floor. The oil is clear and is coming from the left side of the truck somewhere under the driver door area - and...