I have a 2005 Grand Caravan 3.3 engine. I get a fail code of P2305 (secondary coil b low ionization), no spark on cylinder 2&5. I have changed the coil (3 times), the PCM (twice), replaced the plugs and wires and replaced the ASD relay. I've checked the continuity from the PCM to the coil (everything looks good). Engine has good compression. When this first happened it started missing then after parking at the store it ran good for about a half hour. That's when I changed the coil the first time and it ran good for about a week, then did it again and has been doing it ever since. I'm at a loss as to what to do next. Any help would be greatly appreciated.

 

Have you inspected the PCM to coil wire harness inch by inch? Did you verify the PCM coil driver wasn't firing or was changing the PCM just the next logical move?

 

It turns out that this vehicle doesn't like after market coils. Someone suggested trying an OEM coil, so today my son and I went to Wrench A Part and got 2 OEM coils. Put one on and it fixed the problem. So if anyone else has this problem, make sure you're using an OEM coil.
I spoke to the folks I got the PCM from (they agreed to refund my money) and they said some after market coils and actually burn out the PCM because of different resistances.
Thanks to all that answered.

 

Glad you were able to get it fixed! Interesting result, and I don't recall hearing that about aftermarket coils before - plugs, yes all the time but not coils. Did you use 3 of the same aftermarket part? Which one or one(s) did you try before going to the OEM?

 

Actually they were from different places. I got the first 2 from NAPA (my son works there) and the third from Advance Auto parts just to see if it would make a difference. Neither worked.