Start here https://www.youtube.com/watch?v=44yn04pKdSk If it cranks by by jumping the relay the bcm isn't controlling the start relay. As I remember the bcm ground is on the left fender well near the hood hinge. A poor BCM ground would explain the weird behavior. If that doesn't do it you need to scan it for faults.
Doug

Last edited by dvw; 01/28/22 08:48 AM.