OBD-II code · Powertrain (generic, extended)
P2347 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.
Is it safe to drive with P2347?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPersistent knocking on cylinder 12
- PossibleSensor or wiring biased high
- Less likelyGateway module routing CAN messages incorrectly
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–4 h
- Emissions test
- Likely to fail
- Parts involved
- Knock Sensor, Knock Sensor Wiring, Cylinder 12 Combustion
Related codes
- P2344Cylinder 9 Above Knock/Combustion Vibration Sensor Threshold
- P2345Cylinder 10 Above Knock/Combustion Vibration Sensor Threshold
- P2346Cylinder 11 Above Knock/Combustion Vibration Sensor Threshold
- P2348Cylinder 9 Pressure Sensor Circuit
- P2349Cylinder 9 Pressure Sensor Circuit Range/Performance
- P234ACylinder 9 Pressure Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.