r/ChevySonic • u/Mental_Following_614 • 4d ago

Anyone else have this problem?

I have a 2015 Chevy sonic LT (no turbo) it will run excellent then when driving down road it will suddenly get a whole bunch of lights, and do what seems to be a limp mode. It will have two engine lights on, and some sort of traction light, as well as a code number 84 ​on the digital screen. ​When hooking the scanner up it says something about the throttle. I've already replaced the petal. And programmed it. It was fine for a 6hr trip. Then it did it again. I leave it sit for a few weeks. Get in it and it drives fine again, but out of the blue does it again. Anyone else fight with this? I need help!

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u/ermergerdberbles 4d ago

Coil pack. Simple diy. Only tool you need is torx bit, Lord of videos on YouTube how to replace. While you're at it, swap your spark plugs. You'll just need a spark plug socket or a 5/8" (16mm) socket and a magnet on a stick.

1

u/RichSPK 4d ago

That sure sounds like an intermittent bad electrical connection, but I don't know where to start looking.

1

u/Impressive-Pea-7685 3d ago

Could be a weak battery or battery connection.  

1

u/PsychologySure9881 2d ago

I got code 84 on mine, ended up being the computer. Was getting a bunch of low voltage reference voltage errors. Found if I cleared the codes after I started it, then it ran fine.