P2305
Ignition Coil B Secondary Circuit
The secondary side of ignition coil B is faulty. Spark energy at the corresponding spark plug is insufficient, producing misfires.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Worn spark plugCommon
- Coil secondary failurePossible
Parts involved
- Ignition Coil
- Spark Plug
- Spark Plug Wire
P2305 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.