P2344Cylinder 9 Above Knock/Combustion Vibration Sensor Threshold
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- A ninth cylinder exists only on V10 and V12 engines, so P2344 is confined to a small group of vehicles: V10s such as Ford's 6.8L Triton in E-Series vans, Super Duty pickups and the Excursion, the Dodge Viper and Ram SRT-10, and performance cars from BMW, Audi and Lamborghini, plus the V12s. The code means the knock control has found the vibration level in cylinder 9's combustion window above the limit and is retarding that cylinder. No manufacturer was found that documents P2344 publicly; GM and Saab handle single-cylinder knock under P0324 instead. The usual suspects are deposits, fuel grade, plug, injector and noise sources near the sensor of that bank, examined for cylinder 9 specifically.
- What you may notice
- MIL on
- Knocking or pinging under heavy load or towing
- Reduced power
- Likely causes
- PossibleDeposits or hot spots in cylinder 9
- PossibleFuel of too low octane for a high-output engine
- RareWrong or fouled spark plug in cylinder 9
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.