2014 Sierra humming noise

RM4665 · January 16, 2014

Update. I had this issue and took it to the dealer. They isolated it to the driveshaft, replaced it and it's 98% better.

pm26 · January 16, 2014

Cause: Poor quality of GM parts made in Mexico and China.

Edited January 16, 2014 by pm26

RM4665 · January 16, 2014

Probably. I'm debating having a local shop balance the drive shaft to get the last little bit out of it, they pulled another driveshaft off a truck they had in the lot. If I wasn't tuned into it, I probably would not notice what it does now. Ill either forget about it, or it'll bother me forever. It'll cost me $200 to have it taken out, balanced and put back in.

Then again, what's left may not even be it. Vibrates about the same speed range.

Edited January 16, 2014 by RM4665

Oli4 · January 17, 2014

So you're saying it is still there? After they replaced the drive shaft? Almost going in for my first service.

RM4665 · January 17, 2014

It is, but really negligible. If you weren't looking for it you you probably would not notice it. My guess is either this driveshaft is off a little as well or there is something else going on.

C6 Doberman · January 17, 2014

I have the same issue at highway speed. I drove another truck on the lot and it did the same thing. My truck has a steel Driveshaft and the other truck had an aluminum shaft. Same frequency and interval with the noise.

RM4665 · January 17, 2014

After the last couple days I think I'll just ignore it. I forgot to pay attention to it on the way to work this morning and didn't notice it. I'll just make a punch list for the dealer of items when I go in for service next time, hopefully its a short list.

UCR · January 18, 2014

I'm new to this site. I have a new 2014 Silverado LTZ Z71. I get that same humming noise. 1 sec hum 1 sec pause and so on. I'm glad im not crazy and others have heard it as well. Took mine to the dealer today for first service. Two mechanics drove it and never heard it. But they did fix two recalls and change oil. Not sure what to do with noise. Last Chevy before this was lifted to the sky and roared I would have never heard anything but the tires. These things are just to quite of a ride so its easy to pick up on things. Other than that its a great ride and I love it. If anyone finds a answer to the hum Id love to know. I feel like with this being the newly designed trucks the bugs are going to have to get worked out.

RM4665 · January 18, 2014

I'm not so sure what you're talking about is not the below, to a lesser degree after looking around a little bit, but what do I know. If the Torque Converter was bad / getting bad signals, just not as bad as the next guy, maybe you'd just get a hum noise instead.

brandon1282, on 14 Nov 2013 - 14:34, said:

Update: Just was informed that GM has advised the dealership to change out the Torque converter and the Transmission Control Module. My truck should be ready on Tuesday. In the mean time they have given me another 2014 sierra as a loaner....I am interested to see if in the time I have this truck if I notice the same vibration.

As far as tires go, I think we may be talking about two different issues here. The problem I am experiencing (as well as some others on this thread) is intermittent at speed, not a continuous vibration that occurs above a certain speed. If the later is the case, then yes I agree, the first thing I would look at is a problem with tires (or possibly the drive shaft). The problem I am having does not occur every time I am at a certain speed or operating under the same conditions (i.e. it only seems to happen under moderate power between 50 and 65, but does not occur everytime I am under moderate power between 50 and 65).

As always, I'll keep you posted of the findings/results.

Just to update everyone on the rumble strip vibrations I was experiencing. I got the truck back 2 days ago and so far so good. Here is what the dealer reported:

Road tested vehicle and found possible tire/wheel vibration. Removed all four wheels and road force balanced to find one tire out of range. This tire was replaced and then vehicle was road tested again. The vibration improved but was not eliminated. Checked for TSB's and none were found that directly addressed this concern. Contacted TAC and TAC suggested to utilize TBS PIP5149B. I followed all instructions of this TSB, checking for excessive spark retardation and connecting rod oil squitter condition. There were no conditions observed. TAC then directed me to utilize DOC ID#2102430 where I checked the operation of the control solenoid within the transmission. When commended to the on position, It registered full pressure and when commanded off it registered 0 pressure. After completing all tests found that TCM could not be 'pulse-width' tested, only command on or off. With these measurements we determined that the TCM was sending an erratic signal causing the torque converter to be commanded erratically. This caused potential damage to torque converter. Therefore, I replaced the TCM (Signal) and torque converter (damaged internally). Road tested vehicle; now operating to GM specifications with no vibration when tested under the original conditions.

I have also noticed that the "floating Tac" condition I had earlier is no longer present.

Edited January 18, 2014 by RM4665

GMCustomerService · January 19, 2014

Hello RM4665,

I'm very happy to hear the dealership was able to get this vibration addressed for you! Let us know if anything changes.

If anybody else would like us to assist in getting them set up with their dealership please reach out via PM with your full name and contact information, VIN, current mileage, and preferred dealership.

Sincerely,

Jonathan A.
GM Customer Care

UCR · January 19, 2014

Well I did try something I had heard on this topic. I can shift to 4wd auto and hum goes away. That's crazy and now concerns me. I would love to know how it goes when you get yours out of shop.

RM4665 · January 19, 2014

It actually wasn't me, it was Brandon1282. I another post he said it fixed the proem he was having though. I quoted him.

Edited January 19, 2014 by RM4665

GMCustomerService · January 20, 2014

RM4665,

I'm sorry! I must have misread. Remember us in the future if you have any questions!

Sincerely,

Jonathan A. (Assisting Jennifer)

GM Customer Care

C6 Doberman · January 20, 2014

I notice the floating tachometer as well.

Oli4 · February 12, 2014

Here's an update from the Canadian side of the border.

I went in for my first oil change this morning.
I talked about the noise with my service department. They took the truck out for a spin and the tech heard the same noise as I did (yay I'm not loosing it). He came back, took another truck out for a spin (I assume another 5.3L). Same thing. It had the same noise.
He then called GM (I assume GM Canada) but there they had not heard of the issue as of yet.

The tech acknowledged the noise and called it a 'normal operating noise' (he even did the air quotes). The issue is now documented in my paperwork but as of now they don't want to throw parts at it. They asked me to monitor it and call them when it gets worse.