There should have been some code if that message came up. Voltage looks good, but having the battery load tested is probably a good idea. I'm not sure if you need the bypass. IIIRC, the lock plate isn't there on a 2004 6spd. But, if the actuator is, I guess you could still have the fuel shutoff.
99 Navy Blue Metallic, black interior, 6 spd, Z51, HUD, R8C (Museum Delivery featured in the Jan 02 issue of Vette)