2021 silverado 1500 rear tires randomly lock up and skid tires at highway speed

[64BAwagon]

I think youre grossly overstating their ability to affect an outcome. At best they are intended to appease customers. In the end they have no power and only tell you they have made suggestions to the dealer about resources that the dealers are already intimately aware of.  

[MrMagloo]

2 hours ago, 64BAwagon said:

I think youre grossly overstating their ability to affect an outcome. At best they are intended to appease customers. In the end they have no power and only tell you they have made suggestions to the dealer about resources that the dealers are already intimately aware of.  

 

I don't feel your comments are fair. They did come to my assistance with an issue, and was able to make a positive difference.  Perhaps they cannot in every case depending on the circumstances, but any help is good help, Imho.

[64BAwagon]

I am glad it worked out for you. 

 

[GMCustomerService]

On 11/28/2023 at 7:07 AM, Kari Bannister said:

Wow that’s crazy and I’m so sorry that you’re going through all that. 
A little back story on our truck which I haven’t even owned two weeks now. But I found out who the previous owners were they actually happened to be people I know, and I bought the truck from the dealer. Anyhow they have taken it to several dealers including dealers in other states and always told there’s nothing wrong with it. For over 6 months and at least 5 dealers. Even contacts GM and GM put a new motor in it 6,000 miles ago. So what I thought was a truck with 90,000 only has 6,000 on the motor. But GM or the dealer didn’t disclose any of that. Why wouldn’t a dealer want to tell you that information that would make the value of the vehicle higher. But I am also going to call GM this morning and contact the national highway and safety. I’ve also spoken with several mechanics that believe it has to be transmission related but I don’t know what all the dealer actually checks. 

Hello, Kari Bannister. Please know our team is only an email away if you are ever in need of assistance. Thank you and have a great day.

[Jimmy360]

My 2020 1500 3.0 has done it 3 times now. Scared the crap out me. 2 times with trailer once without. Replaced transmission at 70k, didn’t happen before

[richard wysong]

It's the valve body in the trans, 

[Jimmy360]

Thanks. Guess back in the shop. Just had transmission replaced 30,000 miles ago. Hope it’s u set warranty

[richard wysong]

If you go back to the last post in the first page of this thread there is a TSB number, where you are having the same problem it would be worth reading the entire thread, that way it will appear you know what you are talking about when you take it in for the repair

[SFLTruck]

On 11/27/2023 at 11:14 PM, Curtis Atkinson said:

Not only was it nerv wracking to drive the truck i was also T boned by a 1 tons truck May 4th 2022 on my motorcycle and spent 4 months in hospital and lost my left leg and had broken 4 ribs and 3 fractures along my spine and major concussion and broken wrist.. i was already a nervous driver after my accident let alone ready to have a truck make me that uncomfortable and worried about mine and everyone elses safety.. 

 

And sorry for the long message and rambling on..

Did you ever get a resolution to your situation?

[Surge916]

My 21 Sierra 3.0l is experiencing the same issues. I’ve taken my truck in 4 times. Had to pay the inspection charge and was told sorry we couldn’t find anything wrong with your truck. It’s currently at the shop right now. When I called to pick it up I was told they didn’t drive my truck but found a link addressing my concern and would have to keep my truck another 3 weeks or more. Did I mentioned they have had my truck for 3 weeks already. Not to mention that 6 months after I purchased my truck it was in the dealership for the timing wheel being bent. My son doesn’t even want to ride in my truck because of the rear wheel locking up issue. And I can’t be upset it is very scary every time it happens. Semi trucks don’t stop as fast as our trucks and there are many unstable road raged drivers out there already. It’s just a matter of time till something terrible can occur.  I hope your issue was resolved. 

[richard wysong]

read the previous posts in this thread. There is a TSB number . Give that number to your dealer and if they choose to ignore it move up the ladder until you get satisfaction

[smokey4266]

2021 sierra 1500 3.0 10-speed.  Mid July 2024 (63k miles) experienced random shifting in and out of gears at approxately 65 mph.  Pulled over, turned off and back on, made it to destination and no problems after.  Next day same issue.  One time it shifted into a gear so low that the tires chirped and it felt like I hit something. Dealer thought was valve body and due to back order, replaced the entire tranny.  Got truck back and 2 days later problem repeated.  I had dealer tow it this time due to my safety concerns.  20 days later I'm told by dealer that problems is def tank temp sensor. I asked how a def tank anything would affect shifting and was told that if that sensor goes bad it affects alot of other systems. Anybody experience this issue and a def tank temp sensor replacement fix the problem??

[GMCustomerService]

3 hours ago, smokey4266 said:

2021 sierra 1500 3.0 10-speed.  Mid July 2024 (63k miles) experienced random shifting in and out of gears at approxately 65 mph.  Pulled over, turned off and back on, made it to destination and no problems after.  Next day same issue.  One time it shifted into a gear so low that the tires chirped and it felt like I hit something. Dealer thought was valve body and due to back order, replaced the entire tranny.  Got truck back and 2 days later problem repeated.  I had dealer tow it this time due to my safety concerns.  20 days later I'm told by dealer that problems is def tank temp sensor. I asked how a def tank anything would affect shifting and was told that if that sensor goes bad it affects alot of other systems. Anybody experience this issue and a def tank temp sensor replacement fix the problem??

Our team regrets to hear of this ongoing concern with your 2021 Seirra and would like to take a moment to investigate further. When you have a moment, please send us an email to [email protected]. Be sure to include your Username and Forum name in the subject line with additional details. We look forward to hearing from you. 

[newdude]

3 hours ago, smokey4266 said:

2021 sierra 1500 3.0 10-speed.  Mid July 2024 (63k miles) experienced random shifting in and out of gears at approxately 65 mph.  Pulled over, turned off and back on, made it to destination and no problems after.  Next day same issue.  One time it shifted into a gear so low that the tires chirped and it felt like I hit something. Dealer thought was valve body and due to back order, replaced the entire tranny.  Got truck back and 2 days later problem repeated.  I had dealer tow it this time due to my safety concerns.  20 days later I'm told by dealer that problems is def tank temp sensor. I asked how a def tank anything would affect shifting and was told that if that sensor goes bad it affects alot of other systems. Anybody experience this issue and a def tank temp sensor replacement fix the problem??

 

 

Communications data line.  If that sensor uses a shared line like a LINBUS circuit, if there is an intermittent loss of data communications on that data bus from a fault in the sensor, its possible that's how.  

 

Many sensors and components share various data lines.  A fault in one component can cause issues system wide.  

[THE_FPV]

I had this happen to me as well, best I could tell was some kind of short or signal interference with the trailer brake controller. Pulled everything out, cleaned, dielectric greased some connections and wrapped up some junctions on the harness and haven't had any issues since. You would have pretty serious flat spots on your tires doing 62 miles an hour, if not, likely the trailer locking up and not the truck. Well, my experience at least. 

 

Edited September 5, 2024 by THE_FPV