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Hi everyone!

First post here, so here goes.

My wife's 2013 Malibu LTZ had a cooling system leak that it went into the shop for. I had a good trusted mechanic friend handle the job as I just didn't have the time to tackle the job myself. He replaced the water pump, thermostat, belt and flushed the cooling system and refilled with Dexcool. I trust his work, and I looked at everything when I picked up the car.

A few minutes after leaving the shop, a single DTC popped up P0597. I didn't have time to really look at it, but the car drove fine. I brought it back the next day and we came to the conclusion that it was probably a bad part from the parts house that was causing the issue as all the plugs were in good shape. The thermostat was replaced again.

A day later, I picked up the car, and same code popped up. This time, I have time to tackle the problem myself. The issue is, that I've looked at all the possible problems, and am left scratching my head.

I cannot believe that I would have received 2 problematic thermostats in a row from the parts store. I checked fuse 47 under the hood, and it's still ok. It's not blown.

There isn't a problem with power or acceleration, and the temp gauge is working (although only sits around 1/4. Did this before this problem happened) I'm at a loss as to what is causing the issue.

Any chance someone has seen this happen? What am I missing? Should I just pull the thermostat AGAIN and get an AC Delco unit instead of an aftermarket one?

thanks for your help!

-Fig
 

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Must be a 2.0 motor with a heated thermostat. I don't have info for that motor myself.
 

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2011 Malibu LTZ 3.6L V6 Red Jewel Tintcoat
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@LacyNeedsHelp

Please share more info about your own vehicle.
2013 Chevy Malibu. Replaced thermostat and both sensors and still throwing same thermostat codes...I put some baking soda on the electrical cord coming out of the thermostat and around it (they where covered in black gross stuff) it starts and runs fine, temp goes up and stays ab 1/4 so it’s reading (it wasn’t before) I think it’s those cords bc it went off for a while last night, even able to remote start it. But then ab two hours after driving it came back on. I bought silver heat tape to re-tape them and hoping that fixes it. And I know nothing ab cars have just YouTube’d everything, honestly impressed with myself that my car even still runs! Any advice would be greatly appreciated.
 
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