2020 LT Trail Boss 5.3 issues 10 speed issues??

Kimberly Crawford · March 17, 2021

I’m sure there is probably a post in here somewhere with what I’m looking for. But have any of you had any problems with any of these. So first, I’ve already had leaf spring inserts and retorqued ubolts for popping in the back. Have had leaky back window replaced, rattle in dash and seatbelt. Had bed aligned. Was having vibrations and one tire was out of balance so they replaced and re balanced. I am still having vibration issues while driving anywhere from 30-70 it will shake terribly. The steering feels a lot more “loose” and less responsive in curves almost scary In a way and constantly having to correct in no wind/light wind/wind. If you go over a bump it isn’t smooth and throws you everywhere. Also it sometimes feels like the transmission jerks when changing gears like can’t find them or something. If I slow down to a slow speed to stop it has a harsh downshift and then when I slow down but don’t stop then accelerate it jerks very hard also. There is also some ticking or knocking noise all of the time. Just noticed today when I’m going over a bump or uneven surface something in my left front area sounds like it is popping. Last but not least... sometimes when I back up a hill or uneven surface, steering straight/left/right there’s like some whining or grinding noise??? Anyone else having these problems or am I crazy?????

Tahoe02 · March 17, 2021

Sounds like one of those builds(true lemon) when the pandemic started out and things were really bad. With that many issues I would check the Lemon Law for your state and find a Lemon Law attorney. Documentation is key so make sure you have a copy of all the work orders. I Lemon Lawed a first year built Tahoe, 2015, in Florida and received full MSRP plus all GM accessories that I had added. Good luck.

Gangly · March 18, 2021

Clunking from the front left is almost certainly a worn shock. There are several instances of the stock Rancho's wearing prematurely and they will generate a clunking sound once it occurs.

Transmission Woes:

Flush your transmission and utilize the updated transmission fluid from GM if you haven't already.

Vibration:

Vibration while driving is usually an improperly balanced wheel/tire or a severe alignment issue. I would have your tires rebalanced and if that doesn't solve the issue, get an alignment done. If neither of those actions improve or remove the vibration, then make sure all of your steering and suspension components are properly torqued which they will most likely be since the vehicle is still relatively new. If everything is spec'd correctly, then your driveline is the issue (improperly balanced driveshaft, improper pinion angle, improper angles, etc). It's not a hard problem to isolate and diagnose, but it can be nerve racking until you figure it out.

Edited March 18, 2021 by Gangly

Kimberly Crawford · March 19, 2021

On 3/17/2021 at 1:16 PM, Tahoe02 said:

Sounds like one of those builds(true lemon) when the pandemic started out and things were really bad. With that many issues I would check the Lemon Law for your state and find a Lemon Law attorney. Documentation is key so make sure you have a copy of all the work orders. I Lemon Lawed a first year built Tahoe, 2015, in Florida and received full MSRP plus all GM accessories that I had added. Good luck.

Thanks! Yeah I was afraid of that.. I hate to do that I enjoy the truck. But I will have to look into that.

Kimberly Crawford · March 19, 2021

15 hours ago, Gangly said:

Clunking from the front left is almost certainly a worn shock. There are several instances of the stock Rancho's wearing prematurely and they will generate a clunking sound once it occurs.

Transmission Woes:

Flush your transmission and utilize the updated transmission fluid from GM if you haven't already.

Vibration:

Vibration while driving is usually an improperly balanced wheel/tire or a severe alignment issue. I would have your tires rebalanced and if that doesn't solve the issue, get an alignment done. If neither of those actions improve or remove the vibration, then make sure all of your steering and suspension components are properly torqued which they will most likely be since the vehicle is still relatively new. If everything is spec'd correctly, then your driveline is the issue (improperly balanced driveshaft, improper pinion angle, improper angles, etc). It's not a hard problem to isolate and diagnose, but it can be nerve racking until you figure it out.

I had read somewhere on here about a few people having trouble with the shocks. I couldn’t see anything but I may have overlooked it. I’ll have to tell them about it.

I haven’t had that done yet, they told me they didn’t find any TSBS that was similar which I knew was crap because I’ve looked them up.

They have replaced one tire already, rebalanced all of the tires also. I’ve had them check the alignment twice and they said it was within specs. It’s been nerve racking trying to figure out what the issue is. It’s very weird. It does it intermittently, drove it to work today and it was perfect. Steering was tight like when I first bought it and everything else. Everytime I have someone drive it they say they can’t find it. It’s almost like it does it after it’s been driven for at least 30 mins or so.

Troger · March 19, 2021

Wow that sucks. Makes my issues seem minor in comparison. My 6.2L sounds like it has an exhaust leak and evidently it is the fuel system so I'm told and completely normal even though other trucks on their lot don't do this with the same motor. Also my bed looks like Stevie Wonder aligned it. Taken to dealer twice and evidently if there are no trouble codes and it still drives there is nothing they can do. Very disappointing when thinking about how much these trucks cost. Hope you get some resolution.