Ignition Coil I Secondary Circuit
A fault is detected on the secondary (high-voltage) side of ignition coil I. The spark delivered to the plug is missing or too weak, causing a misfire on the cylinder served by coil I. Causes: a worn spark plug or wide gap, a cracked coil or boot, carbon tracking, or an open or leaking secondary winding.
Affected components
- Ignition coil i
- Spark plug cyl i
- Ignition secondary lead
Common causes
- High likelihood: Spark plug worn or fouled
- Medium likelihood: Secondary breakdown inside coil I
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
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.