Check Engine Light On problems of the 2014 Chevrolet Sonic

I had a recall on a component of my catalytic converter that was causing it to move at a low efficiency. I took it in to moss brothers Chevrolet to be repaired. It seemed fine until 1-2 days later when the check engine light came back on. I called moss brothers to inform them of this situation, however, they told me that if I wanted to get it diagnosed and the problem is not covered under warranty, I would have to pay the diagnostic fees. However, I did not have any other issues with my car before taking it to them. It wasn't until afterwards. So if something other than the recall is wrong, I would be willing to bet that it was due to negligence on their part. I took it into autozone to run a diagnostics and it said �catalyst system low efficiency� whatever they did, did not fix my car but only made it worse. I called GMC to see if there was a way around the fee should it be a different cause(if it is, I believe it was caused by moss brothers) and they were not helpful to me at all.

Almost a year since engine last stalled without warning (happened 3 times in about 3 months). When pulling into traffic from a stop, heard 3 chimes and several warning lights lit up (traction control, engine power down, check engine, service car ASAP). Engine at low power, was able to drift into parking lot. Restarted car after several minutes, all lights except check engine went off. Check engine light went off after I put gas in the car the next day. I do not feel safe in this car. Long story short the dealer was going to work with me to take the car back, but bank would not release title (loan is very upside down) until another mechanic looked at the car. Bank wanted me to utilize my warranty program I had purchased with the car loan. Mechanic found p2138 app sensor code. Was leaning into the driver side on the floor to look under the dash and his elbow got wet. Found driver footwell completely soaked: carpet, liner, and carpet pad. Rest of the car was dry. Discovered the sunroof had been leaking down into the car and not draining out properly on driver's side. Could not check entire drain system without removing headliner. Found water had compromised the side air bag and wire harness; several connectors corroded. Sprayed water on wires and was able to replicate engine power loss. Confirmed that water was leaking into the vehicle onto the wire harness. Temporarily fixed the issue with dielectric grease to prevent connectors from getting wet. Mechanic left the panels off so I can monitor the sunroof leaking. I do not feel safe in the car because of the air bag being wet and may not deploy properly, the wet carpet pad which could cause rust and mold, and the corroded wire terminals. Will contact dealer and bank tomorrow. I am hoping they will take the car off my hands as it will be a few years til I can pay it off and I don't want an accident before then.

Thermostat housing and water intake problem. The factory water intake is plastic and does not stand up to heat so it warps and starts leaking. It leaks more when the vehicle is running and under pressure but still drips when the vehicle is parked this causes the check engine light to come on. Went to the dealer they wanted $503 to put 2 gaskets in and would not guarentee what they said it was would fix the problem. I went on your web site and saw 18% of the Sonics sold have this problem. That is only the ones who have complained. I replaced the factory water intake with a metal one and it was good until the plug (which was installed by the manufacturer) on the underside started leaking.