Anthony Bessel

My truck was affected by this among other things. I finally decided to continue trying to right all these things wasn't worth it anymore and traded the Silverado off. Yeah it cost me but it was worth every last nickel, dime, and penny. No more issues and no more trying to maneuver with a dishonest dealership for me. Personally, I think it's sad that something like this could even happen in the first place. Clearly GM screwed up and started installing a brake controller switch that wasn't ready for prime time. Instead of owning their mistake (which they had at least some awareness of in October of '22) and communicating the setback to their dealer network, they just sat on their hands and let these trucks continue to go out the door. The story might be ringing some bells for those of you that remember GM's ignition switch strategy. For me, I tow as a matter of personal utility but there are some in this thread that have had their vacations or jobs impacted; all to a cold shoulder. That's a pretty bad shake considering how much each of you paid for that privilege. I'm no movie star or influencer but I have friends and family that know and trust how much I love cars and motorsport. For my part, I'll be letting them know to stay far and wide of GM products if they can at all avoid it.

Last update to this thread - I was finally able to solve the issues I was having with the Silverado. The solution was simple albeit expensive - I got rid of it. I went back a RAM. As a nice bonus I was actually treated with honesty and respect by the selling dealership. No BS upcharges on the invoice at the time of signing, no lies, just simple.

Based on all my research, I think the true cause of the problem is the straight cut gear on the transmission pump. In other transmissions, the pump would be chain-driven which is inherently quieter. There's even a Ford (also using derivative of our transmission) service bulletin stating that a slight whine noise is to be considered normal. In my case, the sound was much louder than that service bulletin led me to believe is acceptable. It's possible I heard it well because my ears are more sensitive to that frequency (older folks can't hear it for example). It's also possible that at that specific RPM, the sound of the transmission was interacting with the sound of the exhaust in such a way that there was a resonance or some other science that I'm not qualified to speak to. As a silver lining, I'm a person that loves the sound of a good exhaust note. I've had several vehicles now that I've added aftermarket cat-back units to and I think I can fairly and honestly say the 6.2L is the sweetest sounding of the bunch. The only downside I've experiences is the initial cold start loudness. It REALLY cracks and will likely startle the unprepared. It mellows down quickly though.

I have an interesting update to this. I got tired enough of listening to the truck that I ordered a Borla cat-back exhaust. Now that I have that installed, I barely hear the noise at all. I really, REALLY have to concentrate to pick up any element of what I've been complaining about. In other words, if I didn't have a sound to listen for because of this ongoing issue, I wouldn't notice. Either the loudness and pitch of the exhaust is overwhelming the sound OR there was some element of the factory exhaust that was contributing to making the sound louder. Hard to say but I do know the factory exhaust is extremely quiet considering the powerplant sitting in front of it. I'm happy now. I like sound of the Borla and I cannot possibly overstate how relieved I am that I don't have to drive a truck that sounds like it has a fried rear end. Thanks GMCustomerService for offering to help. Ideally, my selling dealership would have actually taken this seriously and pursued a solution. I don't judge the fact a problem happened since these are incredibly complex machines, full of computers and moving parts. Something is going to break at some point. What I do judge is what others do to make it right and in that respect I am very, very frustrated. As I mentioned, I had a literally problem-free Ram before coming to Chevrolet. Since making that decision I've had one vehicle bought-back due to the brake controller issue (in which case I got what amounted to a shoulder shrug from my GM) and then an extremely irritating sound that my dealership doesn't want to help me with. Once this Silverado comes up for replacement you can rest assured I will be giving priority to other offerings.

I did get a chance to drive another 6.2L/10-speed truck and I heard the sound there as well, at the same RPM, although it was quieter. It might be that the transmission wasn't up to temp though. What I do know is it's really, really annoying. I brought my truck back to the selling dealership insisting they have another look but I promptly got the call stating nobody could hear it. Interestingly the only people I've crossed that claim they can't hear it have some kind of hearing damage. Everyone else hears it just fine. One person thought I had really aggressive tires that were howling. As far as I know, my truck shares its drivetrain with the uber-high-dollar vehicles (Denali Ultimate, Escalade) and I just cannot believe they would try to sell a nearly-six-digit or plain six-digit luxury vehicle that sounds like mine does. Oh well I'm just one of about a half million people that bought a '22 Silverado so the fact I'm unhappy with my truck is not even a speck in the grand scheme of things. My dealership is clearly not trying very hard to secure my business either. Having had a 100% trouble-free RAM and then this, it's not hard for me to believe which one is losing market share to the other. Unless someone can engage this problem and actually make a REAL attempt to diagnose it, my next vehicle is going to come sooner than expected and it's not going to have a bowtie in the grille.

In my case, the dealer swapped in the controller from one of their loaner trucks (build date unknown) and it didn't affect the brake controller issue one way or the other. If the controller was revised and is indeed the reason some of us have working trailer brakes again it would have made things easier if they deprecated the old part number in favor of a new one. I've thought about ordering one from one of the internet OEM parts sites but it still feels like a gamble to me.

Agreed! This is fantastic news. I'm VERY curious to hear the result of the new switch.

Does anyone else have this sound in their truck? I understand the 10L80 is going to exhibit some whining sound due to the nature of the design but in my case, the sound can overpower the defroster, radio, and road noise. I'm trying to understand if my case is normal or if there's something that needs looking at.

Has anyone made any progress on this?

I found a Youtube video that demonstrates the sound. The link should take you to the 7:10 mark. As he pulls out you can see the tach. As the needle sweeps past 1500 to 2000 you can hear precisely what I'm talking about: The difference is he only briefly enters that RPM range but for my style of driving I end up there often.

I've been pulling my hair out trying to figure this out. My '22 6.2L has a very loud but very specific whining sound. What I know about the sound so far: Only occurs at 1600-1900RPM The sound cannot be heard when outside the above RPM range 100% dependent on engine speed 0% dependent on wheel speed Higher throttle angle makes the sound louder but the pitch remains the same The sound does not occur in Park The sound does not occur at speed, within the RPM range above, but with the transmission in neutral 4WD mode has no effect on the sound The sound itself is what I would expect to hear with a bad alternator or a worn ring/pinion. I've seen the bulletins on the 10L80/10R80 and I do understand that some whining noise is expected but my specific example is loud enough to overpower the radio, road noise, and Max Defrost with the windows up. It's slowly driving me insane. Enough so that I've started thinking about looking for something else. My dealer said it's a normal sound for the 6.2L but unfortunately I can't test that theory because 6.2L trucks are impossible to find on the lot without a name attached to them. I'm hoping someone here can chime in with their experience.

I happened to notice this when looking through inventory on the Chevy site: This note is on the vast majority of trucks listed but I can't seem to find any information on it. I also found the same message when looking at inventory directly on the dealer sites. Does anyone know what's behind this? Is it possible this is related to this thread?

Out of curiosity, does anyone have a '22 that does not have the brake controller issue?

My philosophy is never not to judge by the mistake itself but rather what's done to resolve it. There's something wrong with these trucks' ability to control a trailer. With such a complex machine, it's understandable that problems might come. GM should have communicated this directly to their dealers; especially when it's regarding a core function of the most popular vehicle in the lineup and its very popular derivatives. I spoke to three dealers and all three claimed to have no idea what I was talking about. I believe them. Instead the trucks found their way onto sales invoices with no parties involved aware the problem that had just been created for the customer. I feel for those of you that have had to cancel vacations or now can't complete important work. In my opinion, anyone approaching GM (not dealership) in a predicament because of this issue should have a buyback waiting for them after a dealership has confirmed the issue. Sure it's going to cost sales and is most likely not good for the bottom line but I think demonstrating they are willing to leave a paying customer hanging because of a known issue (i.e. preexisted the truck and the deal) can't be good for brand confidence.

PIT5498A.pdf Here's a more legible copy of the service bulletin. What confuses me is if there is a known end-date on affected trucks, 9/29 in our example, then does that mean everything built after that date is functioning? Wondering if 9/29 speaks more to when the bulletin was issued because otherwise it means there is a fix but for unknown reasons it can't be rolled out to impacted trucks quickly/easily.