Usually happens when it sits overnight when it’s extremely cold out although it started 4 times today, then wouldn’t start on start #5. It can only be jumped directly from battery. I did notice that I was unable to jump start my other vehicle using the remote (+ve,red) and (-ve,black ground) terminals under the hood sometime before this. Once started and running for 5 minutes or more, it will start without issues for a few days/weeks then fails to start again. I also noticed when this first started occurring that there was a rotten egg smell in the vehicle every time I would get in it. This may indicate the battery overcharging (the vent tube on the battery is properly connected, by the way). It appears that the alternator is charging ( indicator on dash reads around 15 when running) and the battery can still hold a charge so I’m suspecting an electrical connection/electronic issue. All connections are clean with no corrosion present.
What makes this problem better or worse?
It’s worse when it sits overnight and it’s extremely cold
How long has your 2017 Buick Enclave had this problem?
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I have to be honest, my first concern is with the battery itself. Have the battery alone tested for state of charge and the ability to sustain a load. That's key. If not, and not consistently, problems will arise.
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