P2342Cylinder 7 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
- P2342 applies only to engines with seven or more cylinders, in practice V8s and larger. It says the vibration picked up by the knock sensor during cylinder 7's combustion window has exceeded the threshold. On a V8 each bank usually has its own sensor, so the module has to combine sensor choice and crank angle to blame the right cylinder; noise from a loose bracket or the valve train in that window can mimic knock. Saab's GM-based tables therefore run a separate abnormal-noise check between 2,000 and 8,500 rpm to spot a sensor that is not properly bolted. No manufacturer was found that publishes P2342; GM and Saab report single-cylinder knock as P0324. If knock is real, cylinder 7 needs a look at deposits, plug, injector and compression before damage occurs.
- What you may notice
- Check engine light on
- Possibly audible knocking under load
- Less power from retarded ignition
- Likely causes
- PossibleLoose bracket, heat shield or valve train noise in cylinder 7's window
- PossibleDeposits or hot spots in cylinder 7
- RareKnock sensor of that bank loose or wrongly torqued
- RareLow-octane fuel (usually affects several cylinders)
- 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.