Jason Ridge

Since it's been a while, I thought I'd give a quick update. The 2024 GMC Sierra is back in the service department for repairs. The issues with the transmission continued to evolve over the last couple of months. Most recently while driving the truck between 30-50 MPH at low RPM (1200-1500) on a fairly flat road at a constant speed, the entire truck would shake rather severely, just for a moment. The issue was repeatable by just a slight feathering of the throttle at a steady speed. The service rep who rode with me to experience the issue diagnosed it as "TCC shutter." The dealership is replacing the torque converter to address the issue. I'm scheduled to get the truck back late Friday, so we'll see if this addresses the TCC shutter as well as some of the other experiences with the transmission that might have been torque converter-related. I'll post an update in a few days.

Thanks for the reply and information. I did not notice it before the reassembly/repair, but it could very well have been there. Just hard to miss (or have missed). This just seems like improper operation to me...not quite engaging 2nd gear. The rest of the way through 3rd, 4th, 5th, etc...seems fine. It's just the 1st to 2nd to 3rd transition that seems off...like 2nd gear is not entirely engaged (like the clutch not being released). If you accelerate hard right at the transition point from 1st to 2nd...it does engage quite hard and abruptly. I was just curious about others' experiences. This seems like something that could be fixed by a GMC software update to reprogram the shift points (or process), but I'm obviously not a mechanic. There is one other perhaps related issue that I have that I did not include in my post. When parking my truck and just rolling forward...it will slow almost to a stop, there is a clicking noise from the area of the transmission, and then the truck lightly lurches forward. I've almost hit my garage wall a few times. The video below shows this (you'll mostly notice the clicking because I have my foot on the brake to keep it from hitting the wall...so any movement is stopped by that.) Probably unrelated, but who knows... Click and Lurch.mp4

Thanks for the note. Both have been reset and updated. No change. Going back to the dealership tomorrow. We'll see what they say. They tend to feel that there's nothing wrong, but it simply can't be right. It's such a weird way to shift...we'll see.

I have a 2024 GMC Sierra 1500 2.7L Turbomax. I've posted in another section about an oil leak and defective main engine seal I had repaired. Since the repair and re-assembly of the truck, I've noticed what seems to be an overly aggressive torque converter. That's to say, it sometimes acts like a teenager learning to drive a manual transmission...not entirely releasing the clutch or "riding the clutch" a bit. Starting out with normal acceleration, it eases into first, then as it shifts to second, it seems to not engage (or be engaged) all the way in 2nd...staying at a near constant rev speed, then shifts to third, then fourth, and so on. Past 3rd gear, it's fine. But it's the first two to three gears that seem to be "clutch-heavy". When I first purchased it, before it was repaired and reassembled, it seemed much tighter without all the heavy clutch/torque converter aggression. It's not slipping, but just seems to be overly focused on trying to make it smooth...which turns out to be super annoying. Anyone else with the same truck experience this? I posted this quick video so you can try to hear what I'm experiencing. Perhaps this is the way it is and it's just going to drive me crazy. But I wanted to check. Video below. Sorry about the VO...but wanted to point out when it was doing what I'm seeing/hearing. 2024 GMC Sierra 1500 2.7L Turbomax.mp4

Thanks for the question. Yes, from what I can tell, the oil leak itself has been resolved. The issue now is that the truck has some remnant issues that are occurring following the removal and reassembly of the drivetrain. I'm working with GMC to resolve the issues...we'll see what happens.

Wish I had better news. After more than a week with my local dealership service, I as told on Friday that the truck was done (at least that's what I was told.) The main rear engine seal was "rolled" during manufacturing, an "assembly defect." There was also another seal leaking, but I don't recall which one that was. Most all of the drivetrain was removed as well as the back of the engine (bell housing, etc.) to get to the seals...then put back together. It's a very uncommon failure...and something almost never done at a dealership...so hopefully it was reassembled correctly. Everyone said it was quite an issue to repair and rebuild. But there is now drama around the repair. As I said I was told Friday that the truck was done and I could pick it up anytime. My wife and I were traveling for the weekend, so I told my service rep I would pickup the truck on Monday morning. WELL...over the weekend I got an alert from the MyGMC app letting me know, through OnStar, that my truck was driven on Saturday. And not just driven from one space at the dealership to another...it was driven from the SF Bay Area to the base of the Sierra foothills more than 2 hours away...stopped at someone's home for about 5 minutes, then turned around and was driven back. A four hour, 210 mile trip with a few additional stops along the way. I was shocked and contacted my service rep at GMC who proceeded to tell me that the "service manager drove the truck for an additional extended service check." And that is was only "driven around the dealership, in town." The rep had no idea that I had the alerts and all the trip details from OnStar (thank you OnStar). The rep said this is a normal part of the repair...but I guess he forgot that he said my truck was done on Friday...so there was NO reason whatsoever for them to drive my truck. I then shared with him the fact that I had all the OnStar data and the truck was not driven locally, but instead was taken on a 210 mile journey to the Sierra foothills. I let him know that I even had the address and a picture of the home that was visited. His response? He said that "he's just a service rep and did not know the truck was taken or where it was driven." But don't forget, he already told me it was driven locally and who had taken the truck...so his memory became fuzzy the more I presented the facts. I was so shocked by this that I didn't even know how to respond to what was going on with my truck. After taking a beat to think this over, later that day I called my service rep again. This time he said "he had spoken with the service manager who took my truck and that they would comp one month's payment if we could consider this resolved." WHAT?! So you want to pay me off to keep this quiet and just move on. A bribe? We'll, that's not going to happen. What a disappointing, disgusting display and breaking of customer trust. Who knows why my truck was actually taken? What was done with it? If I really wanted to let my imagination run wild...maybe it was used to drop off drugs or for some other illegal activity. Who knows? Because all I get from the service team are continued lies and attempts to say they don't know anything. And there's more...small things...like the fact that only enough gas was put into the truck to make it as un-noticable as possible. But they forget that with the app...I can compare fuel levels, etc. And I don't believe this is a first for this team. They seemed to have a clear initial story...too bad it was all lies and disproven with the facts present in the MyGMC app. For the moment, I've told the dealership I will, under no circumstances, accept my truck back. I've filed a complaint with GM corporate asking for them to buy the truck back. I've reported this to the better business bureau. And...I've contacted the local TV media who report on these types of crazy incidents. We'll see what happens next. More to come Monday. Keep in mind a few things that help explain my concerns: I take care of the things I buy. I have great respect for what I own and I take the highest level of care to keep them in perfect shape. My truck was spotless. I use it as you should use a truck, but I take care of it. I don't let ANYONE drive my truck (other than my wife.) My truck only had 2800 miles on it...and now has nearly 3100 miles. So this mess added nearly 10% to the mileage which will affect my lease, wear and tear, etc. Who knows. I wish this was easier. I should have been. But you can't make this stuff up...still can't believe this happened. The repair was bad enough, but it was repaired and could have been dealt with on it's own. This new twist just adds a whole other layer to the issue that really provides for additional significant concerns. Insult to injury. Anyway, it's a total mess. I'll provide an update later this week once this plays out a bit more.

We'll see what they say tomorrow. I would assume replacing the rear cover assembly would mean removal of the transmission. Hopefully I'm wrong there. Not sure I would be willing to stick with a new truck that has to already have a fairly significant repair made. Hopefully it's something much easier.

I have a new 2024 GMC Sierra 1500 Elevation with the Turbomax motor. Everything has been fine to-date, but yesterday noticed a few drops of oil underneath my truck. Taking a closer look, it appears that I have a fairly significant oil leak, but can't really tell where it's coming from. There are drops on different sides of the oil pan and lower transmission pan...and a general film of oil on a good portion of the rear engine and transmission areas (probably blown back while driving. I'm taking it in to be checked tomorrow, but wanted to see if other are having similar issues and had any specific results from having it repaired. And sorry if this is a duplicate topic from another forum, I did not find the same issue anywhere else. In the photos attached...you'll see the areas where the oil is dripping, pooling, and general spread across the underside of the truck. Tough to tell what exactly is leaking, but I'm sure I'll hear more tomorrow. Hoping it's nothing significant and just a simple tightening a loose screw... Thanks!