Problem: The engine would intermittently crank over but not start. Once started, it would also stall.
Details: The technician retrieved one diagnostic trouble code: B1517 5A - Battery Voltage Plausibility Failure (stored in BCM). Next, he tried to communicate with the Body Control Module. There was good communication, so he decided to check all the main fuse connections in the under-hood fuse box. The fuses were in perfect shape so he inspected the fuse strip connections at the battery. When he wiggled the positive cable connection at the main fuse buss, the engine died. When he checked the rest of the nuts on the fuse bus, he found another one loose.
Confirmed Repair: He torqued all the fuse buss nuts to specifications and the problem was solved.