This is what happens if you do not get the software update to the TCM.
Again as a reminder there is NO FIX for this issue by GM because they are refusing to fix it. Apparently there is an aftermarket fix for this by Next Gen Diesel. They did thorough testing and figured out what causes it and what happens. They also confirm the issue does not affect Ford A10's and the carbon upgrade package on Fords replaces the Valve body and again no issue. Only Allison and Generation 2 A10s on GM vehicles. Generation 1 A10's do not have the issue, so GM changed the Valve body in Generation 2 A10's which caused this issue. And yes, your A10 can in fact blow up (get destroyed) because of this issue.
People really need to watch this video.
Quoted from Next Gen Diesel:
https://nextgendiesel.com/blogs/tran...ow-we-fixed-it
Quote:
"So How do I Fix It?:
Before we get to this, we need to identify if your transmission has been significantly damaged or not. The strongest and most accurate indicator of this will be fluid complexion. If the fluid looks new or almost new, you can likely perform a valve body upgrade to correct the condition. If the you wipe the fluid on a white towel and it appears any darker than a red wine, it is contaminated with a large enough amount of clutch material to where this is a meaningful amount of wear inside the transmission. This does not automatically mean the transmission is “toast” but it does mean that a large amount of wear has taken place. In this scenario, upgrading the transmission is the best option. If you’re unsure how to decipher your fluids color, simply send us a picture and we’ll have an expert review it.
In short, if your fluid looks like the jar on the left, it’s transmission time. Of the fluid looks like the jar on the right, it’s valve body time unless you’d like to perform a transmission upgrade voluntarily.
A simple “spring kit” or “updated valve body” is not a fix for this problem.
TCM Tuning and spring kits did not have any significant impact on the problem either; better or worse.
Conclusion:
Don’t let General Motors or their proxies at the dealership lie to you. We can’t shout this loud enough. There is a fix, and there has been a fix the entire time they knew about this problem and even before. We want to get this information out to as many consumers and technicians as possible so that these vehicles can get back on the road reliably and safely.
In fact, many dealerships have bought these parts off us at their own expense because they know that if the vehicle is down for an extended period of time, they may be legally required to purchase it back off you. A $100,000 truck is much more costly then a few thousand dollars in parts and wrench time.
If you’ve been effected by this recall/problem and need outside support, Next Gen Drivetrain™ is the only name you need to know. Our staff are trained at length on this recall, and we’re providing support all over the planet.
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Not going to quote everything they said, use the link and read what they found.