2014 Sierra wouldn't start

[DH66]

The other day I went to start my 2014 Sierra which has 16k miles and it wouldn't turn over. No interior lights came on, horn wouldn't work, basically seemed like the battery was dead/disconnected. Checked the battery voltage and it was 12.8V, tried to jump it and still nothing. Waited around 30 minutes and we were going to try and jump it again but when I got in the truck the interior lights came on and I was able to start it with no problem. Taking it to dealer tomorrow to see if they can find something, but I am not sure they will because everything is working fine now.

[The Zip]

Taking it to dealer tomorrow to see if they can find something, but I am not sure they will because everything is working fine now.

 

That's ok everything is working fine now, but there is something going on. Have the service tech write up your complaint to run an electrical diagnosis and also check for loose engine or battery grounds.

[Phillip123]

Don't take that "working fine now". That doesn't mean it will be fine 3 days from now or a week, there is definitely smth going on.

[SILVER SLED]

Like was said, take it in. Have it checked over and scanned. There is a bulletin for a bad ecm ignition relay, causing an intermittent no crank. It's bulletin# 5253B.