Powertrain, generic (extended)

P2341 Cylinder 6 Above Knock/Combustion Vibration Sensor Threshold

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Cylinder 6 is the last cylinder of inline-six and V6 engines, and P2341 reports that its share of the knock sensor signal has crossed the limit. Modern knock control adjusts ignition timing for every cylinder on its own, so a single cylinder can run retarded while the others keep optimum spark; the code tells which one keeps knocking. How a manufacturer reports this differs: GM and Saab use P0324 for excessive knock on one cylinder over more than 8 s, while knock on more than one cylinder or an improperly bolted sensor leads Saab to the sensor performance codes P0326/P0331. No public manufacturer document using P2341 was found. Check fuel quality, deposits, the plug and the injector of cylinder 6, and whether a loose part is making noise in that crank window.

Likely causes

Fuel octane too low for the engine
Deposits in the combustion chamber of cylinder 6
Loose component or valve train noise read as knock
Lean mixture in cylinder 6 from a restricted injector

Symptoms

  • MIL on
  • Knocking at full throttle or uphill
  • Reduced power

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–4,000
Time0.5–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

knock sensorcylinder 6

Related codes

P2340P2342P0324P0326P0331P0306

References: saabwisonline.com, en.wikipedia.org, law.cornell.edu.