Yokun 2012 cranks, but won’t start ((sometimes))

[Abdu1aziz]

Hi everyone, my Gmc yukon 2012 sometimes in the morning cranks over and over then starts and sometimes starts but after couple seconds without check engine light and my fuel pump is working great.
After the engine warms up, this problem disappears like it never happened.

This is it notice that the RPM plays slightly than engine starts

This video has no connection with my car but mine has the same situation and sounds the same ((sometimes))

 

[Fless]

Moved you here from Site News.

 

[petethepug]

You need a scan from a parts place. Blind internet diagnosis is the crank position sensor or fuel pump.

 

[Fless]

Another blind diag or WAG: missing or corrupt cam position sensor signal, or the crank position sensor needs a CASE relearn. One of many things that can cause intermittent long crank times.