GM 2014 SIlverado 6.2L Cracked Push Rod - Help needed

[davidncurtis]

I currently own a 2014 Silverado High Country with a 6.2L and I have 33k miles on it. So on Monday I noticed that my engine was running very rough and then all of a sudden the Check Engine Light came on and started flashing therefore I brought the truck straight to the dealer. After there inspection they determined that my 6.2L cracked a push rod so I'm currently trying to get GM to warranty the fix.

 

The problem is that the dealer sent the truck codes in with my EFI live tune which consisted of the speedo change for the larger tires, premium fuel (which is required for optimal performance) and the active fuel management turned off. With the truck being lifted and larger tires it never went into V4 mode anyway. I was going to remove the tune but it would remove the check engine light so I wanted to make sure the dealer found the problem.

 

Once GM reviewed the codes they told they dealer that they would not be paying for the repair.

 

I have worked on a ton of engines and this is the first that I have seen of this. The dealer has not investigated any further. From what I was taught, if the push rod fails, the lifter had to fail in order to make the push rod fail or maybe I'm wrong but that's what makes sense to me.

 

 

Has anyone heard of the Push Rods or the Lifters failing on the newer 6.2L engines? Any help would be awesome.

 

I have owned Chevy trucks my whole life and I have 15 work trucks for my business and I buy two each year to switch them out. This is the first that I have ever seen of this.

 

Any thoughts? I know that the tune did not cause this but GM is basically saying the tune voids the warranty and I'm out of luck.....

[newdude]

GM has run into some failed AFM lifters collapsing due to oil aeration (locking pin in the lifter gets damaged). The rods that failed, were they on an AFM cylinder?

[davidncurtis]

GM has run into some failed AFM lifters collapsing due to oil aeration (locking pin in the lifter gets damaged). The rods that failed, were they on an AFM cylinder?

 

I was told that it was on the Number 4 Cylinder. I'm not sure if that is one the AFM cylinder or not

[O_J_Simpson]

It is well known that GM does not like aftermarket tunes. Sending in the truck for repair with a tune is terminal to a power train warranty claim. Sorry but this repair is on you. The bigger issue is did GM void your entire power train warranty or just this claim?

[Arth]

Honestly? It's the dice you roll. It's the dice any of us roll with a tune.

 

The tune modifies how the engine runs from the factory. So they'll play the no warranty card all day because you went away from factory set parameters. It won't matter now if the tune caused this or not.

 

You are on your own and you accepted that once you loaded that tune I think.

[07Softail]

There have been issues of AFM lifters going bad not sure about pushrods though. Not to pour salt in the wound but you should have pulled the tune out.

 

RT

[davidncurtis]

Yes the tune should have been pulled, you are right that is on me. In order to remove the tune and install the factory I was going to have to clear the engine codes which I didn't want to do at the time because I wasnt sure if it was an electrical problem or what so I didn't want the code to go away and the problem not be fixed.

 

I have looked into the history of the AFM lifter issues and the recalls, but I was wondering if any has seen this on newer trucks....

[davidncurtis]

Honestly? It's the dice you roll. It's the dice any of us roll with a tune.

 

The tune modifies how the engine runs from the factory. So they'll play the no warranty card all day because you went away from factory set parameters. It won't matter now if the tune caused this or not.

 

You are on your own and you accepted that once you loaded that tune I think.

Yep this is what I'm getting from GM. It just sucks because the tune was very basic (tires, premium fuel and AFM delete). These changes shouldn't cause the push rods to crack.

 

I'm more worried about what else is wrong with the engine and why this is happening....

[Arth]

I agree with you something else is at play here.

 

Normally tunes modify fuel parameters, ignition timing, and things of that sort.

 

Still though I feel at this time your pursuit of warranty is lost.

 

Yep this is what I'm getting from GM. It just sucks because the tune was very basic (tires, premium fuel and AFM delete). These changes shouldn't cause the push rods to crack.

 

I'm more worried about what else is wrong with the engine and why this is happening....

[tbarn]

Could you better describe or show a pic of the cracked pushrod?

[RyanbabZ71]

Who did the tune?

 

 

Ryan

[davidncurtis]

Could you better describe or show a pic of the cracked pushrod?

I do not have a picture of the push rod as I haven't been back to the dealer yet.

 

From what I'm being told the push rod is cracked and they are thinking that half of it is in the oil pan. The push rob is connected to the cam shaft by the lifter which Is used to open and close the valves. they haven't open the engine totally yet as when they opened the valve covers they saw that half od the rod was missing.

 

Still trying to gather more facts but in the years that I have owned a Silverado I have never has this happen. Its a very strange issue and the dealer has even said this is a very strange occurrence.

[tbarn]

So the push rod broke. #4 is an AFM cylinder. The lifter probably failed.

[m3n00b]

Sorry to hear OP. It seems GM will always pass the buck.

[Daryl LBZ]

There is no way the tune caused that hard part failure. This is probably contributed more to the lifter than anything. This is what happens when you design a complicated system with more moving parts, things fail. GM knows this, and the tune is their way of getting out of fixing it.