P2302
Ignition Coil A Secondary Circuit
A fault is detected on the secondary (high-voltage) side of ignition coil A. The spark delivered to the plug is missing or too weak, causing a misfire on the cylinder served by coil A. Causes: a worn spark plug or wide gap, a cracked coil or boot, carbon tracking, or an open or leaking secondary winding.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Worn or fouled spark plugCommon
- Coil secondary winding failurePossible
Parts involved
- Ignition Coil
- Spark Plug
- Spark Plug Wire
P2302 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.