I've been having an issue with my car recently where the battery will "die" when I attempt to start my car the morning after an extremely cold night (<32 F). I drive a 2013 Hyundai Genesis, 3.8L V6, 4 door sedan. I live in Indiana (US) so it gets pretty cold but we aren't talking about much below 0 aside from windchill.
Here's my scenario:
I unlock my car, push the Push to Start button, hear a click, and then lose all power to the car. To fix this, I have to go to the battery and push down on the cable connecting the positive battery lead to the car. Once I've done that, the car regains power, and starts up just like normal. I've attempted to tighten the fastener for the positive lead but it is as tight as I can reasonably get it (although there is still some movement to it if you pull/push hard enough). This issue 100% does not happen at all if the outside temperature is above 50 degrees. This was something that came up last winter, I dealt with it, it went away in the Spring/Summer so I thought it was miraculously fixed, but unfortunately the issue came back the day we had outside temperatures below ~40 F.
There are a few outliers to this:
- A few times the car has lost power on the initial unlocking of the door
- Even less frequently, the car will regain power before I've even gotten to the battery (this has happened only once or twice).
- Sometimes the car will lose power on Push to Start after it had just started normally no more than an hour earlier.
Outside of those outliers, it remains consistent to scenario I've outlined. I'm wondering if anyone has any idea of what could be happening and why it is so heavily tied to the outside temperature (specifically cold weather)?