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Sometimes it’s not the miles or the model that defines a truck ownership story as it’s the moment everything unexpectedly changes. That’s exactly what happened to Greg Lewis, whose recent Facebook post in the “2024+ Duramax Trucks” group caught my attention today. Greg shared that his 2024 Silverado 2500 HD had been mostly trouble-free until he brought it in for a transmission and transfer case service at 55,000 miles. After the dealership replaced a leaking seal and a faulty trailer brake controller, the truck immediately began downshifting harshly, making loud banging noises, and even locked up the rear tires. When he brought it back, the dealer told him the transmission might act strange after service, but the issues only got worse. Now he’s been told the valve body failed, the part is on backorder, and he’s stuck in a loaner with no fix in sight.
Here’s Greg’s full story in his own words:
“Has there been a lot of transmission issues with the 2024 2500 HDs? I know the earlier 10 speeds have valve body issues and what not. Has GM updated the internals at all to combat the issues? My truck is in the shop right now with trans issues and I’m not happy about it. I ordered and picked up the truck in Feb of 2024 and since then put 55k mostly trouble free miles on it. At 50k I took it in for trans/transfer case service and they found the seal was leaking on the trans. They had to replace the trailer brake controller due to it acting up.
So they ordered parts and a few weeks later I dropped it off for them to fix said leak, it was done in two days and I picked it up. Upon leaving the dealership (Wheelers Chevrolet in Coloma, WI) I slowed down to the 1st stop sign and every time it downshifted it sounded horrible, metal banging and was jerky. Thought maybe it was a fluke so I went to the next stop sign. It got worse and the last time it downshifted it actually locked up the back tires on the pavement. Me being pissed, I turned around and went back to the dealership and said you guys messed something up. Explained what all happened and the guy at the desk said sometimes they act weird after a service like that. We crawled underneath the truck and after they worked on it and they never cleaned the trans of anything so there was trans fluid all over but didn’t see it leaking. Was told to drive it a day or two and if it doesn’t go away bring it back in. I myself was going to explode from being pissed so I left, drove it the rest of the day and the next morning it locked up the back tires again so I made a beeline to the dealership and told them to give me a loaner now and fix this.
Few days went by and he said it was the valve body that went out and it’s on backorder. Is it just a coincidence it went out then or did they mess something up? I’m 3 weeks without my truck now and I’m pissed. I’m driving around a used 1/2 ton Duramax loaner right now and need my truck back. I loved the truck and spec’d it out to fit me for my needs and it was my dream truck and 1st brand new truck. I’m really concerned about the longevity and how long it’ll last after driving it the way it was and if I’ll have more issues in the future. I’m starting to regret buying it and part of me thinks I should’ve gone with an F250. I started a case with GM because they told me they have no idea when a valve body will be in and when it’ll be fixed. I want to get on with my life and need a truck.”
Owners Speak Out
Greg’s experience isn’t an isolated case. A growing number of Silverado HD owners have shared similar frustrations. One owner said their 2024 Chevy 2500 HD started showing problems just a week after purchase, which raises serious questions about early quality control.
Kevin Weaver, another 2024 Duramax owner, commented, “My 2024 Duramax is in the shop now, 36,000 miles and the valve body went out. Been waiting for three weeks. No estimated time when they will ship the part and they gave me a stupid electric blazer in place of a 2500 truck. Thinking I should’ve went Ford. I understand things break, but it’s pathetic that they don’t have parts available to fix it.”
Then there’s Jordan Goodrich, who added critical insight into what’s (not) being done about it on GM’s end. He said, “My understanding is the valve body and trans only received software updates and no changes to the trans or valve body themselves since the 10-speed came out. Now they are continuing to update software that limits the transmission if it gets to the point of locking up. All I know is that if it happens to mine, I’m voiding warranties and going with an aftermarket valve body solution and weight reduction if GM doesn’t find a legitimate solution. If there is no legitimate solution from GM, the powertrain warranty doesn’t matter.”
This is especially troubling for buyers debating whether to upgrade from a 1500 to a 2500 HD for towing purposes. Greg’s story might just be the kind of experience that makes people second-guess such a move.
Jrg George chimed in with a different kind of frustration. “I have a ‘24 Denali and I just got a letter in the mail and in my app that they are going to be replacing my transmission. They are also going to be re-flashing my radio again, doing the tailgate recall, steering gear box and replacing the interior seal on my sunroof. Good times.”
The situation paints a different reality from GM’s messaging. Despite their push to position the Silverado lineup as a brilliant combination of EV capability and diesel performance, stories like these reveal a clear gap between marketing and ownership.
It’s also a jarring contrast to GM’s promise that the 2024 Silverado HD brings more power, more tech, and easier towing, especially for those now stuck waiting for parts or driving vehicles with faulty transmissions.
When Confidence Collides With Reality
These stories really stick with me not just because of the mechanical issues, but because of what they reveal about trust and expectations. When someone buys their first brand-new truck, especially one they’ve custom-ordered to suit their needs, there’s an emotional connection that runs deeper than just owning a piece of machinery. It’s about pride, reliability, and believing the product will deliver not only on the road but in peace of mind.
When that trust is broken and not by chance, but by what feels like poor workmanship or delayed accountability, it creates a lasting impact. Owners don’t just walk away upset about repairs; they walk away questioning their brand loyalty and their long-term confidence in the vehicle. These kinds of breakdowns aren’t just mechanical as they’re emotional too. In the rush for more power and tech, the auto industry can’t afford to leave customer care in the rearview mirror.
Key Takeaways:
- Routine service shouldn’t leave your vehicle worse: If your truck drives worse after a dealership visit, push for answers and don’t accept “it just happens.”
- Backordered parts are becoming a serious ownership burden: A valve body failure shouldn’t strand an HD truck owner for weeks.
- Dealership transparency matters: Miscommunication after a failed repair can destroy trust between owners and service centers.
- The 10-speed transmission still raises questions: With many owners reporting similar issues, it’s time for GM to address long-term durability concerns.
- Don’t ignore early warning signs: Harsh downshifts, banging noises, or locked tires should never be brushed off as “normal.”
What About You?
Have you experienced issues or parts delays with your Silverado or another GM truck?
And would a situation like this push you to consider switching brands, or do you believe every truck maker has its share of problems?
Let me know about your experiences in the comments below.
Aram Krajekian is a young automotive journalist bringing a fresh perspective to his coverage of the evolving automotive landscape. Follow Aram on X and LinkedIn for daily news coverage about cars.
Image Sources: Chevrolet Gallery
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Source: torquenews.com
