sonic boom 222
New member
My 2015 Sonic hatchback headlights flicker as well as the dash lights. Dealer says they can find no problem. So I made up a digital volt meter to plug into the lighter socket and the voltage bounces from 15.2 volts to 13.8 volts , worse is when driving. I suspect a loose ground having dealt with this problem years ago with other cars. Today I went to the service manager with my volt meter and videos on my cellphone and he agreed something is wrong but needs to check with GM engineering. Any one know where he frame ground is located on this car? I'm getting near the end of my warranty and want to get it fixed before it runs out.
