dealer called me and they seem have found the electrical problem: bad Alternator
I have several aftermarket mods/accessories installed so GM wouldn't cough up for the 2hrs diagnostic time but they did cover the alternator.
the tech wrote:
voltage spiking bcm opening ignition relay, remainder of entertainment and information modules erratic communication, found 100-800mil second 18+voltage spike with cold engine operation, isolated.
I just picked it up and on the drive home it worked fine, I am going to take a nice long road trip on Sunday and I will report back if the problem returns.
I have several aftermarket mods/accessories installed so GM wouldn't cough up for the 2hrs diagnostic time but they did cover the alternator.
the tech wrote:
voltage spiking bcm opening ignition relay, remainder of entertainment and information modules erratic communication, found 100-800mil second 18+voltage spike with cold engine operation, isolated.
I just picked it up and on the drive home it worked fine, I am going to take a nice long road trip on Sunday and I will report back if the problem returns.