2020 AT4 6.2 towed

RadBrad · October 8, 2020

Hmm seems like that makes all trucks in here 8/20 builds. Mine is also 8/20, 900 miles, LZ352412 So a USA build, but I think engines all come from the same factory.

chadr0 · October 8, 2020

At another to the ever growing list. 2020 6.2 AT4 - i dont know the build date but i assume it's around the 8/20 mark.

I've had mine for 5 days with about 250 miles on it. I was driving down the highway when suddenly i get an adaptive cruise control disengage warning, parking brake failure warning, steering assist failure warning, and then it completely died all within about 10 seconds. All the interior electronics worked and it would let me shift between gears, but it wouldn't turnover.

I was going 80mph in the left lane of a 6 lane highway when all this went down. Luckily i was able to coast it over and some truck drivers were able to help block traffic to let me get to the shoulder. When i opened the hood i could hear the battery ticking, but that's the only thing i could tell. I thought it may be the alternator cable recall, but since all the electrics were working i'm worried it could be the valve spring.

I had it towed to the dealer and am waiting to hear back.

Edited October 8, 2020 by chadr0

Sparty577 · October 8, 2020

Sorry to hear you were affected as well, I'm glad you were able to safely get to the side of the road- that could have been really bad.

I've had my truck back from the dealership for about a week, but am still nervous that I'll have another valve spring break .. Wish they would have changed all of them. I'm also still waiting to hear whether they will offer the 100k mile coverage component letter/warranty that the OP received. Not how I envisioned the first few weeks of owning my dream truck, frustrating to say the least.

Transient · October 8, 2020

So is this something I should mention to my dealer or let it play out see what happens? My truck is a ft. Wayne Texas truck it says on the door. All 6.2 motors are assembled in Tonawanda I think?

No. Many are built in Silao, Mexico too.

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Transient · October 8, 2020

At another to the ever growing list. 2020 6.2 AT4 - i dont know the build date but i assume it's around the 8/20 mark.
I've had mine for 5 days with about 250 miles on it. I was driving down the highway when suddenly i get an adaptive cruise control disengage warning, parking brake failure warning, steering assist failure warning, and then it completely died all within about 10 seconds. All the interior electronics worked and it would let me shift between gears, but it wouldn't turnover.

I was going 80mph in the left lane of a 6 lane highway when all this went down. Luckily i was able to coast it over and some truck drivers were able to help block traffic to let me get to the shoulder. When i opened the hood i could hear the battery ticking, but that's the only thing i could tell. I thought it may be the alternator cable recall, but since all the electrics were working i'm worried it could be the valve spring.

I had it towed to the dealer and am waiting to hear back.

Were you going downhill when this happened? I had the same exact issue about 4 weeks ago, but since nothing mechanical was going on I was able to pull off the freeway and get to a truck stop. I called my brother since he's a mechanic. Told him what happened. It amounted to nothing more than an electrical gremlin. He said to turn off the truck and then turn it back on. When I turned it back on everything was cleared and fine. A few weeks later I took my truck to the dealer for an accessory to be installed and told them about what happened and asked them to check for codes. No codes found.

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LSUAT4 · October 8, 2020

17 hours ago, RadBrad said:

Hmm seems like that makes all trucks in here 8/20 builds. Mine is also 8/20, 900 miles, LZ352412 So a USA build, but I think engines all come from the same factory.

Dealer finally got the truck in to look at it, it’s going to be there awhile, valve springs are on back order and they don’t have an ETA. Again the customer is the one inconvenienced and having to drive one of their loaner cars instead of a brand new AT4.

bjr2020 6.2 · October 8, 2020

3 hours ago, Transient said:

No. Many are built in Silao, Mexico too.

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How do you find out where your motor was built?

Transient · October 8, 2020

How do you find out where your motor was built?

I don't know. I just know that GM's facilities in Silao, MX include a propulsion systems assembly plant where they make only V8 gas engines that include the 4.8, 5.3, 6.2, and supercharged 6.2. They also produce 6-speed and 8-speed rwd transmissions.

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steelcity · October 8, 2020

1 hour ago, bjr2020 6.2 said:

How do you find out where your motor was built?

Does it make a difference? Are the bad springs in motors built in Mexico or U.S.A., or both?

bjr2020 6.2 · October 9, 2020

3 hours ago, steelcity said:

Does it make a difference? Are the bad springs in motors built in Mexico or U.S.A., or both?

That’s what I’m wondering as well......

RadBrad · October 9, 2020

11 minutes ago, bjr2020 6.2 said:

That’s what I’m wondering as well......

Are there any USA built trucks in here that have broke a spring? Your two letters before the last six numbers in your VIN would let you know.

LGXXXXXX is a Mexico build

LZXXXXXX is a USA build

steelcity · October 9, 2020

38 minutes ago, RadBrad said:

Are there any USA built trucks in here that have broke a spring? Your two letters before the last six numbers in your VIN would let you know.

LGXXXXXX is a Mexico build

LZXXXXXX is a USA build

Would that tell you were the vehicle was built or the engine? Where the engine was assembled is what we are trying to find out. Are the engines assembled right there at the final assembly plant or are they assembled elsewhere and shipped in?

Edited October 9, 2020 by steelcity

RadBrad · October 9, 2020

36 minutes ago, steelcity said:

Would that tell you were the vehicle was built or the engine? Where the engine was assembled is what we are trying to find out. Are the engines assembled right there at the final assembly plant or are they assembled elsewhere and shipped in?

yea not sure, just wondering really, and I'm sure your right that engines are shipped in...so truck vehicle build wouldn't matter at all then...