Truck struggling and some form of whining noise

[cubangt]

So have had any issues with my truck since i got it, today was a normal day, early morning to work, then lunch and head home, after work made a stop at the familes house, left and noticed that the truck was struggle, like something to do with the throttle, but no engine light came on, stuck to the feeder  (about 3 miles), if i got up over 45 or 50, things seemed normal. But lower speed it was more noticable. Idles fine, but while driving it just seems like it didnt know how to shift(maybe)

Before getting home, i stopped in a parking lot and let sit for about 20 minutes, and started back up and still there, then the noise i noticed once i was in the neighborhood since it was quiet so it was clear that there was a noise of some sort.. 

Truck has 46k miles, last oil change was around 42k

No other recent services performed on the truck

 

Since its the weekend, not planning on driving, but want to see what if anything i can check before monday.. 

Fluids?

Plugs?

Wires?

Bad Gas?

Im at a loss why everything was fine the first part of the day and now this.. 

Looking for some suggestions on things to check, since i dont remember getting the extended warranty, dealer is last on the list until i have tried what i can.

 

Edited March 13, 2021 by cubangt

[cubangt]

This morning i checked fluids and seem normal, checked trans fluid with truck off and on, checked out clean.Oil was normal levels.

Havent driven it, but while it was on, the sound i heard lastnight in the driveway was not there.. 

 

Any suggestions on other things to check?

Throttle body dirty?

Mass air flow sensor dirty/bad?

[cubangt]

So today i took the truck around the neighborhood and no sound or struggling. Trans fluid temp got up to around 104 for that short drive.

After i got back home, i let it sit for a few minutes and decided to take it down the road about 1.5 mile round trip and struggled once, shifted funny once and trans temp got up to 133 this time around..

The sound could be heard when in closed area where it would echo off a wall and the only way to describe the noise, is it sounds like the noise a steering pump makes when its been run dry, but to be clear that is only what it sounds like, its not the steering thats the problem, just how it sounds so i can describe the noise when i rev it in the driveway.

During the longer drive, i did notice that even though the drive was going well, the rpm's would slightly jump up a bit, nothing noticable while driving, just noticed while watching the tach.

 

Can anyone offer suggestion on what it could be or what else to check? Should i clean the throttle body and Mass Air Flow sensor to rule those out?

[CamGTP]

Maybe it's in the transmission if it's a whine sound. Like pump or converter issue.

[14LTZ-1LZ]

Is the sound more louder or hear it more when you are going up hill? 

[truckguy82]

You leave it in auto4wd?

 

A whining noise is common in auto4wd, I’ve heard it before and am like wtf is that noise, then I remember i left it in auto4

Edited March 15, 2021 by truckguy82

[cubangt]

57 minutes ago, 14LTZ-1LZ said:

Is the sound more louder or hear it more when you are going up hill? 

No hills around to try, other than my driveway, at this point, not going to drive it until i figure out if i have the extended warranty.

but to answer while backing into the driveway saturday when i took it for a short drive, the sound got louder the more i gave it gas.

Also while in park if i rev it up, the sound is there and louder the higher i rev the rpm's

[cubangt]

7 minutes ago, truckguy82 said:

You leave it in auto4wd?

 

A whining noise is common in auto4wd, I’ve heard it before and am like wtf is that noise, then I remember i left it in auto4

At first i thought maybe i had switched it into something accidently friday, but when i went out to check , it was still on 2wd. 

I have only used the 4wd the year i got the truck when i was going hunting, other than that, never used it and havent purposely switched to 4wd for any other reason so far.

[cubangt]

warranty verified, so having the truck picked up tomorrow afternoon to get it taken in. So we will see what they find.. 

[Doublebase]

Sounds like you have a transmission pump problem, keep us posted, but the whine, the lack of power, weird shifts...I'd say pump and torque converter.

[cubangt]

That seems to be the consensus, the mechanic i take all my vehicles to, said the same thing, but because the truck still fell under the factory powertrain warranty(which i didnt know) the extended warranty company and the mechanic asked to take it to the dealership, so dropped it off friday evening, so hopefully will know something this afternoon or tomorrow.. 

 

I was reading and watching some videos that this year silverado was known to have a transmission issue. That there was a GM Bulletin for it, does anyone know of this and what bulletin it is? 

[6Chevyguy]

My 2017 makes a whining sound in the first 3 gears or so . am gonna stop by my transmission builder for opinion .   he already told me these 6 speeds are notorious for shredding the pump and converters  

[cubangt]

So after not hearing from the dealership since monday i called yesterday and they said the tech agreed with the mechanic, that it seems to be the pump and torque converter, so they were already ordering the parts and would know more once they open it up and take a look inside. So as of yesterday, thats what the consensus was. We will see what they say today or tomorrow, when i get another update.

[cubangt]

After a week and 2 days, got the truck back, it was def issues in the trans, but I forgot to bring the paperwork with me to post what they found.. Then as they said a "coincidence" my AC stopped blowing cold, which I don't know, but i know it worked before and didn't when i picked it up. Luckily I have the extended warranty, so ponied up the deduct and got that fixed.. But to me, still seems to make the noise, the drivability is def better, but they said that the computer is still going thru a relearn process which takes around 1000 to 2000 miles. is that a legit statement?

If it happens again, i mean ill still be within the powertrain warranty, but didnt know it had to relearn for that long when internal parts in the trans were replaced, not like they replaced it with a whole new trans. 

 

but ill post a list of what they "found" and replaced to take care of the issues.,