[Hawkeye1]

Honestly, they are so new that we don't really know how the long-term reliability for this particular powertrain will pan out - the new small engine family (1.0/1.4T/1.5T) is a clean-sheet redesign. You probably have some of the higher-mileage 2016.5/2017s out there. It's an all-new engine design, and GM seems to be still investigating the cause of the failures. I have heard rumors that there may be a service bulletin or recall for the LE2 engines in the works similar to the Malibu, along with redesigned pistons, but nothing confirmed yet.

I am one of the people that reported on another thread that there is a computer reprogram in the works for the 2016. I have gone through 2 02 sensors due to soot covering them and leading to lean conditions in cylinder 1. My fuel trim was at -17 the last time I took it in for th po15b check engine light. I am afraid of piston damage and my service advisor has been great about getting on GM, but I was told at the end of May that they were working on the programming/fix and here we are two months later with no fix.

 

[Hawkeye1]

Thanks for replying, but it is exactly what I didn't want to hear. Did you get any codes other than po15 b? Did you notice any changes in mpg- mine has been pretty consistent and good. I really don't want to deal with major engine work.

 

[Hawkeye1]

Do you happen to have a bulletin number off your paperwork? I just talked to a higher -up person with GM customer service about not having a fix yet. They are going to get back to me this week. I started a case with them 5 months ago and the light keeps coming back. I would think they would need to clean out the exhaust some how because my sensors are always caked with soot. They replaced it twice and cleaned it once. I told them I want a buy back if they can't fix it on this fourth try. I love the car and would prefer a fix.

 

[Hawkeye1]

Thanks for the response. My service advisor said the gm tech got back to him about the reprogramming. It is the one for the 2017s and they are trying it on the 2016s. I still don't know what the difference in the model years might be, but I hope it works. I go in on Thursday.

 

[Hawkeye1]

The update is officially for the 2016s. My dealer has been great and is emailing gm to give me an extended warranty since this is the 4th time fixing it for the same issue. If it doesn't work, they will start the buy back process. I hope it works because we love the car except for this one issue.

 

[Hawkeye1]

Sorry to hear yours has the piston issue. I was wondering if you were experiencing the po15b code for the oxygen sensors? If so, how many times did they replace the sensor? I have driven about 5000 miles since they did the update and am hoping I didn't get any damage. They extended my bumper to bumper warranty to 6 years 100,000 miles at the request of my dealer just in case.