Cylinder 12 Ion Current Sense Circuit Low
Ion current from cylinder 12 is below the expected window. Spark plug fouled, signal wire shorted to ground, or sensing path interrupted.
Affected components
- Spark plug cyl 12
- Ignition coil cyl 12
- Ion sense module
Common causes
- High likelihood: Spark plug fouled with carbon or oil
- Medium likelihood: Sense wire shorted to ground
- Low likelihood: Connector pins corroded - high contact resistance
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.