Mechanic says electrical system will not power coil. Can't find why. Any ideas?

What is your question?

Problem started with power loss in engine while driving. In shop now, but mechanic can't figure problem. Originally thought it needed new timing kit. Now has tried cam sensor and new coil. still won't start. Says electrical system will not power coil. Any ideas what might cause that? No noises when loss of power occurred. No leaks apparent. he's had it for a month and think he is stuck.

What makes this problem better or worse?

Not running now and can't start

How long has your 2003 Volkswagen Passat had this problem?

when it happened we towed to a garage