Kaze Morrissey

To keep things updated, it’s now the three month anniversary that my truck has been in the shop. Once they put the new engine in, it’s been nothing but replacing sensors and fuel balancers. It seems that they only replaced the engine and I am “assuming” that all the ancillary parts and sensors were kept from the old motor. I hope for the rest of us, I am the only one that has this issue. GM hasn’t reached out and I’ve already started the process for lemon law. Dealership has been commendable in keeping me updated with each new part they’ve been having to order and install, but I think this truck is done and has been unfortunately for quite some time. thanks for all the input.

Dealership was told to not tear into the engine and is just going to swap it out for a new motor, so I may never know what happened.

Yeah, that’s what I was thinking as well. Hoping I can get an answer as to what happened. Don’t quote me on this, but it sounds like GM is asking the techs to not tear apart the engine and just send the whole unit back to them to tear into. I’m not too surprised that they don’t want the local mechanics to tear into the engine before they have a look at it themselves.

Here’s a video of the noise it was making right before it died along with the vibrations. The oil was changed by the dealership and I drove it around for another 50 miles of commuting before this problem arose. I do love the truck and hope that this does get resolved. I did check the oil level and that was in spec on the dipstick, couldn’t confirm the oil type (haven’t calibrated the taste buds to oil type yet:). I had done my own break in oil service at 500 miles before I started any towing as recommended by the owners manual, so I knew it had the right amount and correct oil prior to the dealership as I put in only the GM oem oil and filter. The truck was being driven in between 70-80 temps when I started off and while I do understand that the incorrect oil would be bad for the engine, I don’t see how it could’ve caused this noticeable problem that quickly. So far haven’t heard much from the dealership beyond that GM is going to replace the engine. One service rep thought it might be a lifter, but don’t see how that could’ve caused the vibrations. Dealership said it’ll probably take to the end of the month for me to get the truck back. Currently they’re working on a loaner for me. Hope this helps any of you guys out there. I do think it’s a great truck and loved the motor when it was working. Again, there were no warning lights and all the oil pressures and temps looked normal as I was scrolling through them on the dash. There was a faint burning smell from the engine compartment after I opened the hood, but no over temps on any gauges or any other indicators of an overheating situation. Really bit of a head scratcher.

Was searching the forums to see if anyone else had this issue, but it seems I may be the first and possibly aware of a second to come across this problem. So, 2020 Silverado high country with about 6000 miles. Has towed a travel trailer all over the western US with no issues beyond pouring in a lot of DEF. love the truck. goes in for an oil change before it’s next big trip and have dashcam installed. Drive another 50 miles of commuting no issues. Hook up the trailer to head to Utah and start feeling a mild vibration 10 minutes into the trip. Think a tire went out, they’re fine, think maybe new spring bars on the WDH causing weird harmonics. Notice vibration is associated with engine speed between 1500-2000. Checked oil pressure, temps, everything looks normal, no warning lights. Then a noise starts like the cooling fan is hitting something. Decide to pull over, make a turn at an intersection, engine drops to idle then dies. Again, no warning lights. Go to start the motor, turned over a few times then dies as if low battery. Attempt another start, now it acts like the batter is dead and all power goes out. Doesn’t even turn over the motor. Have to call tow and get it towed back to dealership. its been at the dealership for over a week now. They went through all the electronics and can confirm that it’s not a dead battery. Been speaking with my service rep and he’s saying they’re in contact with GM. I’m suspecting the engine may have seized. Had video of the sound and shaking and a diesel mechanic buddy thought it might be a rod was thrown. After the engine stopped, I checked that there was oil in the engine and paper work showed the proper oil type. the interesting part was my service tech called in to say another truck had come in with identical issues. So hoping this isn’t a fleet wide issue. Will keep posting updates as they come. prior to this, hadn’t had any issues with the truck. Drove great, gas mileage was amazing, towed as if the trailer wasn’t even there. Hopefully will have some answers.