Valve Body Replacement - 2023 Silverado Custom Trail Boss

[GeoHawk]

On 3/7/2025 at 1:58 PM, s10dragracer888 said:

@GeoHawk is there any way you can reference your work order and indicate whether or not the new valve body part number is different? I would assume it isn’t, but who knows. As far as I know, they’re replacing the valve bodies that fail with the same failure-prone parts.

Unfortunately I don't see a part number listed on the work order, just that the valve body was replaced.

[s10dragracer888]

On 3/8/2025 at 10:35 AM, Dan H 2023 HC said:

The details of the 462,000 rear wheel lock up recall are all over the place, I read 2 articles that said it was the 8 speed. Regardless, thanks for the correction.

 

Even so. The 462K recall is for 2020-2022 trucks/SUV's with the LM2 3.0 or L5P 6.6 diesels (the D-max 6.6 uses the Allison branded 10-speed, a HD variant of the 10L transmission family). Since the lock up recall does not include the 2020-2022 gas 5.3 or 6.2 it stands to reason there is a difference in the 10-speeds used in the LM2/L5P diesels from those used in the 5.3/6.2. Gearing, VB, clutch packs, programming. Maybe all.

 

While excessive wear in the VB of the 3.0/6.6 transmissions was identified as the cause for the rear wheel lock up recall the failure mode for the 3.0/6.6 is different than the failure more for the 5.3/6.2, for which there doesn't appear to be any reports of lock-up.

 

Probably just all academic. While the 3.0/6.6 and 5.3/6.2 failures involve the same sub-assembly, the VB, how they are failing isn't the same which is why the 462k recall doesn't include the 5.3/6.2.

I found out from a tech on Friday that the 3.0-mated 10 speed is nearly identical to the 5.3 and 6.2 variant. They use the same valve bodies.

[s10dragracer888]

On 3/8/2025 at 10:35 AM, Dan H 2023 HC said:

The details of the 462,000 rear wheel lock up recall are all over the place, I read 2 articles that said it was the 8 speed. Regardless, thanks for the correction.

 

Even so. The 462K recall is for 2020-2022 trucks/SUV's with the LM2 3.0 or L5P 6.6 diesels (the D-max 6.6 uses the Allison branded 10-speed, a HD variant of the 10L transmission family). Since the lock up recall does not include the 2020-2022 gas 5.3 or 6.2 it stands to reason there is a difference in the 10-speeds used in the LM2/L5P diesels from those used in the 5.3/6.2. Gearing, VB, clutch packs, programming. Maybe all.

 

While excessive wear in the VB of the 3.0/6.6 transmissions was identified as the cause for the rear wheel lock up recall the failure mode for the 3.0/6.6 is different than the failure more for the 5.3/6.2, for which there doesn't appear to be any reports of lock-up.

 

Probably just all academic. While the 3.0/6.6 and 5.3/6.2 failures involve the same sub-assembly, the VB, how they are failing isn't the same which is why the 462k recall doesn't include the 5.3/6.2.

I found out from a tech on Friday that the 3.0-mated 10 speed is nearly identical to the 5.3 and 6.2 variant. They use the same valve bodies.

[66ss3964spd]

On 3/12/2025 at 6:31 AM, s10dragracer888 said:

They use the same valve bodies.

That's interesting. 

 

Even if they are the exactly the same, something is making the VB's wear differently in the diesel equipped vehicles than the VB's in the non-diesels, which is why the 462k recall is only for the diesels to prevent wheel lock up, which the gas vehicles aren't doing.

[Michael Lung]

On 3/4/2025 at 11:09 AM, SCOOTER1951 said:

Michael, did U ever get it fixed, if so, how long was your wait?

I've been waiting 2mos so far...NO eta available!

Sure did, it’s buried in the first few pages of the thread. Took about 3mo for it to get fixed. My dealer was able to get a whole new transmission. 

[Michael Lung]

On 3/13/2025 at 12:01 PM, Dan H 2023 HC said:

That's interesting. 

 

Even if they are the exactly the same, something is making the VB's wear differently in the diesel equipped vehicles than the VB's in the non-diesels, which is why the 462k recall is only for the diesels to prevent wheel lock up, which the gas vehicles aren't doing.

My mis-shifts were so bad that it would lock my rear wheels and break traction for a second, causing the cruise control to disengage. Was quite violent, and I have a 5.3L gasser. 22K miles on my new transmission, and so far I’m alright. Wish I knew about the NextGen’s when I was dealing with my repair fiasco. 

Edited March 16, 2025 by Michael Lung

[66ss3964spd]

That's interesting too, Michael, I don't think I've read a single thread - until now, about the wheel lock up issue with the 5.3/6.2. 

[Srode1]

On 3/16/2025 at 6:28 PM, Michael Lung said:

My mis-shifts were so bad that it would lock my rear wheels and break traction for a second, causing the cruise control to disengage. Was quite violent, and I have a 5.3L gasser. 22K miles on my new transmission, and so far I’m alright. Wish I knew about the NextGen’s when I was dealing with my repair fiasco.  

Nextgen's? 

[s10dragracer888]

6 hours ago, Srode1 said:

Nextgen's? 

NextGen Drivetrain’s valve body and separator plate upgrades for our 10L80’s.

[SCOOTER1951]

Hi, not sure who this may help. It will HELP the Canadians with this valve body PROBLEM

 

I have a 2022 Silverado HC 5.3L 10 speed with ZERO reverse. It sat @ the dealers for over 2mos

with ZERO ETA. I went looking on computer & found CAMVAP. They will help us with vehicle problems

under warranty here in Canada. To make a long story short, 11 days after I contacted CAMVAP, I had my

TRUCK back ready to go. This all came down here in Ontario in mid March 2025. Canadians with this problem,

give them a try. Won't regret it!!

[kyle clayson]

after a full month multiple calls to GM/BBB/Attorney General and multiple calls to the dealership finally got my truck back today. Horrible experience.Hope this helps everyone. let me know how everyone else made out.

 

[MCL]

Frustrated to say I'm now a part of the club as well. Let me preface this by saying I've owned multiple Ford's and drove hundreds of thousands of miles with never being stranded on the side of the road (call it luck, whatever). My truck was recently totaled and I decided to give GMC a go. Purchased a used 2023 Sierra 3500HD Denali L5P with ~33k miles, just 2 weeks ago (absolutely loved the truck so far). Over Easter weekend I traveled 3 states away to visit family, planning to tow a trailer back to my home state. The night before Easter I was topping the truck off with fuel, getting back onto the highway, and as soon as the truck went to shift above 6th gear, limp mode was activated, P0747/P0700 present. Obviously the dealerships are closed on Easter, I dropped the truck at a local dealership Monday morning (4/21). They complete their diagnosis and confirm the Valve Body needs to be replaced. Surprise, new valve body is STILL on back-order, with NO ETA for the new part to be available.

 

Dealership would not provide me with a loaner vehicle as I would have needed to drive it three states away. Understandable, I'll just work with GM when I get back home to get a loaner from a local dealer, right? Rental agency had no trucks available last minute that could tow, having to leave my trailer 3 states away as well. I've since returned home, (had to cover rental cost to get home) and the local dealership's won't provide me with a loaner as they're not the ones doing the repair on the truck. 

 

I've reached out to GM support, to which they offered a $44/day stipend for a rental vehicle. HOW am I supposed to replace a truck via rental for $44/day? And then I'm supposed to cover the charge for the rental until the truck is repaired, which we DON'T even have an ETA for!?

 

Aside from the replacement/loaner vehicle situation in the meantime, HOW is this part still on back order? I have multiple trips planned over the next month that require a tow vehicle, and no timeline when I will be able to get my truck back. So now I'm covering the charge for a rental and about to start making payments on a $70k+ truck, that's THREE STATES AWAY. This is just unacceptable from a major OEM, and I'd be lying if I said I didn't regret going away from Ford.

Edited April 23, 2025 by MCL

[Srode1]

17 hours ago, MCL said:

This is just unacceptable from a major OEM, and I'd be lying if I said I didn't regret going away from Ford.

Unfortunately another data point supporting my choice to stay away from the 10 speed trucks.  Of course Ford is using the same transmission (or a varient) and is having similar valve body problems from what I have read.  Can't say if they are having problems with parts shortage though. 

[stan hopkins]

My 2024 GMC Sierra 1500 transmission valve bodies went in Oct and I got my truck back in early Jan. My dealer called me a few weeks ago and stated there was a conditional recall that took effect in April 2024 that needed to take place. The condition being anyone who had gone through valve body replacements under warranty. So for the last 2 days my truck was in the shop having this completed. 

The recall number is listed on the invoice but I couldnt find anything with more details on google. 

[truck-girl]

Thank you for posting this! Ours was also replaced in October also and we have noticed a couple minor shifting issues. I'll try to call the dealer to see if we are included in the recall.