Code P2305

My car suddenly start to putt and miss, lose power then the engine light came on. Went to the part store, and the machine read misfire on cylinder two and ignition coil. So I had a tune up done, ignition coil replaced, and a fuel injector replaced. Car stopped for a few minutes and started back. So the mechanic grounded the car and it stopped then the engine light went off. Few hours later it started back. Put it back on the machine and it is throwing pretty much the same code. P0 I think and P2305 ignition coil b secondary circuit. What could it be if it has been repaired? He is thinking electrical.