Kickback on startup 2008

[gmburd]

When I start the truck, I get a kickback on startup . backspin and then starts. 2008 escalade, 80000miles, 6.2 liter. what controls the timing? As if too much advance on start up. Runs fine otherwise.
Any thoughts on that?

[Blue Bowtie]

It may be a good idea to check the crank position sensor and sensor phasing, and possibly perform a relearn. Failing that, there is a risk of damaging a starter or more. Been there:

[gmburd]

Thanks bowtie. I'm thinking of replacing sensor. Is relearn automatic or dealer scan tool? Anything to do with coils?

[Blue Bowtie]

Relearn is usually intiated with a bi-directional scanner.