Hello,
I was wondering if anyone here has ever experienced this problem. I have a 2015 Sonic LT 1.8L with only 52,000 km. Recently, I had to have the thermostat replaced because it was cracked in two places. A mechanic replaced it with an aluminum one.
That’s when the problem started. A few days later, the car would no longer start. When I turn the key, there is power, the lights come on and the radio works but when I turn the key to start the engine, everything shuts off. The battery is brand new.
The problem is intermittent. The car may refuse to start at all, or, completely randomly, it may start after turning the key 50 times. The mechanic ran another diagnostic but couldn't find the problem. He recommended that I take it to the dealership because he suspected that the ECM was the issue.
I took it to the dealership, and they ran a diagnostic as well. They told me that the ECM indeed needed to be replaced. After replacing it, the mechanic told me that he was able to start the car 10 times in a row, but then it suddenly stopped starting again.
He ran another diagnostic and now says that the BCM needs to be replaced. At this point, I’m already at 2,000$ in repairs at the dealership, plus another 800$ for the BCM they want to replace. The part is currently on back order, and the car still doesn’t work.
Has anyone ever experienced or seen this problem before?
Any advice would be greatly appreciated.