Looks like mine can be added to the list too. 3 weeks out of the dealer without even a chance to do anything to mine. Rough idle, service stabilitrack and traction control lights all on this morning. No real "event" to speak of, drove home normal from my sons baseball game last night. Everything was fine. Started up this morning with remote start and it was having the issue when I got in the car. 3170 miles when I started it this morning.

 

That sucks what year is it? Build date?

 

2014 not sure the build date

 

Cars still at the dealer. They are replacing all 4 pistons.

 

SMURFKILLER just blew 3rd engine 12,232 miles . im getting rid of this POS. good job cadillac you have lost another customer. how many of these cars have to blow up 3 , 4 or 5 times before you get this right?

 

I haven't even made my first payment and it needs an engine. I've been super nice to them but I'm getting out of this car one way or another. They can determine if that will be as a gm customer or not.

 

It's hard to tell from the forum but have most of the blown engines been tuned or is it about equal?

 

We don't have enough information to know and I agree with the above. Car not tuned - no chance they will say it is tuned. Car tuned - at least a decent chance they will say it wasn't tuned.

 

My guess is that, if the engine(s) have been "tuned" and are still supposedly under warranty then you'll never get a straight answer. "Tuning" and unauthorized modifications automatically voids the powertrain warranty, and the final call on that decision is pretty much the dealership's assessment. The written warranty is pretty specific on this, and a statement from a servicing tech to the service manager something like "This vehicle has been modified" is the nail in the coffin.

 

Are these all LTG 2.0T engines?

 

No. There are a few that have had this issue. I for one have 33K miles on my car without any issues.

 

27k #3 piston

 

I don't think warranty work shows up on Carfax (?), and it's not a recall/TSB so it wouldn't need to appear there either. Engine replacement would qualify as warranty work.

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I'm hoping the fact I have a '15 model that they've worked out most of these issues already.

 

Lets rev the heck out of these new engines, screw the break in procedure.

 

400 miles later Pistons crack again.

 

Mine was just replaced. 2014 2.0T 9900 mi. They replaced the whole engine.

 

What is your car's build date? Auto or manual?

 

3/14 Auto.

 

Don't really see anybody talking about bad pistons anymore, is it safe to say it may have been a bad batch or bad tunes? I honestly lost hope in my ATS when I had a diablo tune, inconsistency, knocking, diablo themselves even tried to fix the tune over email and it was still unreliable... I gave up and sold the tuner. With my new tuner everything has been perfect. Now that some are even getting 400whp, I am just wondering has anybody else had any issues?

 

I think the idea that the sky is falling and don't buy one because of the issue was way overblown.

I also think the hydro lock theory isn't likely because if it was I don't see how all of this liquid isn't accumulating and eventually killing many (if not all) of the 2.0T's. Basically if it happened to some cars with a few thousand miles I would expect most to eventually fail if the design wasn't change, and it wasn't.

Anyone tell me how the hydro lock only affects a tiny number of engines and once a rash of cars failed the number of incidents goes way down?

 

Possible root cause for Bad Pistons: http://gmauthority.com/blog/2013/12...y-connecting-rod-bearing-issued-with-gm-four-cylinder-engines-wont-be-recalled/

 

Sorry, but that's really old news and in no way has anything to do with the piston failures on the 2.0T

 

As much as I want to agree with you and blame a bad batch of parts. Another forum member had the failure and his car had a build date of March 2014 with 9900 miles. Mine is build date 10/13 22800 miles and no failure. I still has a small fear of it happening one day.

 

Build date of 10/12. Tuned w/ larger turbo and no problems @ 16K miles. Didn't burn a drop of oil on 3700 mile fairly high speed trip from S FL to VT and back. Love the car!

 

Build date of 10/12. Tuned w/ larger turbo and no problems @ 16K miles. Didn't burn a drop of oil on 3700 mile fairly high speed trip from S FL to VT and back. Love the car!

Mine is a build date of 10/12, 16.5K miles. No motor issues.

 

mikesul what turbo are you running?

 

Sorry for asking this if it's already been covered. How do you tell if you have possible loss of compression besides running a compression test? I have a shutter around 2/3k RPM range every now and then

 

I doubt a compression issue would be intermittent and only show itself at 2/3k but to answer your question:

You can check for excessive blow-by in the crankcase by removing the oil filler cap.
If you don't want to do a compression test another way is to do a leak-down test where you are supplying the pressurized air and measuring how much escapes. It still requires a special tool though.

 

Has anyone run carfax reports for the cars that had the piston failures? I just ran a carfax on one I was interested in buying and noticed before the sale of the car the dealership did a "Body computer/module reprogrammed", then again at 12000 miles. the piston(s) were then replaced at 15k miles

 

I'd make sure you get a warranty, unless the GM powertrain warranty is still available on the car.

 

Add me to the list. 2014 ATS4 2.0T w/ 12,800 Miles... Man, its a love hate w/ this car I've got the dark charcoal with the red interior and Performance Package. Car is fun but riddled with issues. I just dropped it off at Braman.

 

Tuned? and if so by whom? Probably won't get an honest answer.

 

Nope, my Diablo Sport tune just came in the mail today actually. She didn't live long enough....

Got a call from the dealer today, they are replacing the pistons. Not exactly happy about that but oh well.

How many of you guys have had the long block replaced as opposed to just the pistons?

 

Nope, my Diablo Sport tune just came in the mail today actually. She didn't live long enough....

Now that sucks.

My pistons were replaced at ~6000 miles, was running a Diablo tune at the time for <1000 of those miles. Ran without the tune after the piston replacement and the rough idle symptoms returned after ~1,000 miles. Checked compression and #1 Piston was 100psi vs #2, #3 and #4 which were all at 120psi. Piston #1 was the same one that failed the first time.

I'm scheduled to take it back in again next week.

The number of reports of a 2nd failure in a short time makes me think the guys putting these things back together are still on engine building 101, or just throwing the old pistons back in there.

Good luck to you guys, and I hope you get a chance to enjoy your tunes in the future.

 

My pistons were replaced at ~6000 miles, was running a Diablo tune at the time for <1000 of those miles. Ran without the tune after the piston replacement and the rough idle symptoms returned after ~1,000 miles. Checked compression and #1 Piston was 100psi vs #2, #3 and #4 which were all at 120psi. Piston #1 was the same one that failed the first time.

I'm scheduled to take it back in again next week.