P2359
Ignition Coil L Secondary Circuit
The ECU detects a secondary-circuit fault on ignition coil L (cylinder 12 on a V12 or another high-numbered cylinder). The cylinder will misfire if the spark output is insufficient.
- 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
P2359 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.