WHY DOES MY SECURITY LIGHT FLASHES AND IT WANT CRANK WHEN FLASHING on 2003 GMC Envoy

IT CRANKS WHEN ITS NOT FLASHING BUT WHEN IT FLASHES IT WANT DO NOTHING

Asked by for the 2003 GMC Envoy
3 answers
there maybe a problem with the onboard security system...
Do you use the same key every time?
scan anti theft for codes and post so we can adv