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2015 Chevy Cruze 1.4
We had been struggling with the coolant leaks. Fix a hose work a few days then suddenly no coolant again. Took it to dealer finally. They said it was the reservoir and housing and something else. The next day the coolant was empty again. We took it back up there. This time they said it was the water pump. They replaced the water pump. We’re now out $1350. Well within a few days we got the service stabilitrak and check engine lights. We don’t know where to begin. The check engine light is throwing a million codes. One being that it lost communication with the ecm. We’re not losing engine power. It throws misfire codes but it’s not misfiring. Our car isn’t covered under the negative battery cable. And we really don’t want to take it to the dealer and they not know what the real issue is. We just paid all that to fix the coolant issue so we can’t afford more dealer fees. But we need a running safe vehicle. What do we check??
 

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2015 Chevrolet Cruze LT 1.4L Turbo
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2015 Chevy Cruze 1.4
We had been struggling with the coolant leaks. Fix a hose work a few days then suddenly no coolant again. Took it to dealer finally. They said it was the reservoir and housing and something else. The next day the coolant was empty again. We took it back up there. This time they said it was the water pump. They replaced the water pump. We’re now out $1350. Well within a few days we got the service stabilitrak and check engine lights. We don’t know where to begin. The check engine light is throwing a million codes. One being that it lost communication with the ecm. We’re not losing engine power. It throws misfire codes but it’s not misfiring. Our car isn’t covered under the negative battery cable. And we really don’t want to take it to the dealer and they not know what the real issue is. We just paid all that to fix the coolant issue so we can’t afford more dealer fees. But we need a running safe vehicle. What do we check??
Welcome to the forum!

I'm sorry to hear about the persistent issues that your having with your Cruze. I used to work in the automotive service industry for 10 years as a service advisor. It is entirely possible that this is a separate issue and a coincidence. However, you have spent quite a bit of money with this particular dealership. Personally, I would ask to speak with the service manager at the dealership and see if they will perform a courtesy diagnosis since the issues are occurring one after the other.

Please take some time to introduce yourself HERE so that we can get to know you better!
 

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2015 Chevy Cruze 1.4
We had been struggling with the coolant leaks. Fix a hose work a few days then suddenly no coolant again. Took it to dealer finally. They said it was the reservoir and housing and something else. The next day the coolant was empty again. We took it back up there. This time they said it was the water pump. They replaced the water pump. We’re now out $1350. Well within a few days we got the service stabilitrak and check engine lights. We don’t know where to begin. The check engine light is throwing a million codes. One being that it lost communication with the ecm. We’re not losing engine power. It throws misfire codes but it’s not misfiring. Our car isn’t covered under the negative battery cable. And we really don’t want to take it to the dealer and they not know what the real issue is. We just paid all that to fix the coolant issue so we can’t afford more dealer fees. But we need a running safe vehicle. What do we check??
Sorry to hear about your issue. This sucks.

My recommendation is that you always ask the dealer if they guarantee it will fix your problem. They often want to "try" parts which is not a real diagnosis. It's also a great idea to get a second opinion, especially on big ticket items like this.

The dealer seems to be incompetent to some regard so taking it to a local service provider that has 4.5 or higher Google review to diagnosis your remaining issues is probably a good idea.
 

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2014 LT program car, Pull Me Over Red
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2015 Chevy Cruze 1.4
We had been struggling with the coolant leaks. Fix a hose work a few days then suddenly no coolant again. Took it to dealer finally. They said it was the reservoir and housing and something else. The next day the coolant was empty again. We took it back up there. This time they said it was the water pump. They replaced the water pump. We’re now out $1350. Well within a few days we got the service stabilitrak and check engine lights. We don’t know where to begin. The check engine light is throwing a million codes. One being that it lost communication with the ecm. We’re not losing engine power. It throws misfire codes but it’s not misfiring. Our car isn’t covered under the negative battery cable. And we really don’t want to take it to the dealer and they not know what the real issue is. We just paid all that to fix the coolant issue so we can’t afford more dealer fees. But we need a running safe vehicle. What do we check??
The surge tank, the water outlet and the thermostat housing along with the two sensors are what mostly go wrong on the Gen I 1.4. All of those parts are cheap and easy to install yourself. Occasionally on a high mileage or heavily used Cruze the hoses may also go. The water pump may have been covered under a special warranty. The battery cable is $30 and extremely easy to install.
How-To: 2011-2016 Cruze Antifreeze/Coolant Flush
How-To: Replace 2011-2016 Cruze 1.4L Coolant/Water Outlet
How To: Change the Water Pump on 1.4 Turbo Cruze


Water Pump Service Bulletin - NHTSA
Special Coverage #14311: Negative Battery Cable
 
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