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.
Affected components
- Ignition coil
- Spark plug
Common causes
- High likelihood: Worn spark plug
- Medium likelihood: Coil secondary failure
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.