Cylinder 5 Ion Current Sense Circuit Low
Ion current from cylinder 5 is below the expected window. Spark plug fouled, signal wire shorted to ground, or sensing path interrupted.
Affected components
- Spark plug cyl 5
- Ignition coil cyl 5
- 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.