Cylinder 12 Above Knock/Combustion Vibration Sensor Threshold
The knock or combustion-vibration sensor monitors the structure-borne noise of each cylinder. The signal level for cylinder 12 has stayed above the diagnostic threshold for an extended period, indicating either persistent knock or an electrical fault that biases the channel high.
Affected components
- Knock sensor
- Knock sensor wiring
- Cylinder 12 combustion
Common causes
- High likelihood: Persistent knocking on cylinder 12
- Medium likelihood: Sensor or wiring biased high
- Low likelihood: Gateway module routing CAN messages incorrectly
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.