Powertrain, generic (extended)

P2337 Cylinder 2 Above Knock/Combustion Vibration Sensor Threshold

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2337 is the cylinder 2 entry of the per-cylinder knock series P2336–P2347. Using crank position, the engine module splits the knock sensor signal into one window per combustion event and compares the vibration level in cylinder 2's window with its threshold; above it the code is stored and spark for that cylinder is pulled back. The only manufacturer document found that names it is Stellantis bulletin 09-009-26 for the 2.0L turbo plug-in hybrid engine of the Jeep Wrangler 4xe and Grand Cherokee 4xe: it extends the engine warranty without time or mileage limit, requires a lit MIL plus one of P2336–P2339, blames debris and foundry sand left in the engine and replaces it completely. One cylinder alone over the limit points to a local cause rather than poor fuel, which would hit all cylinders.

Likely causes

Internal damage from debris left in the engine (Stellantis 2.0L PHEV)
Deposits on piston or valves of cylinder 2
Wrong or worn spark plug in cylinder 2
Mechanical noise falling into cylinder 2's knock window

Symptoms

  • MIL on
  • Audible knocking, especially under load
  • Reduced power or sluggish acceleration

Repair estimate

DifficultyHardWorkshop job
Parts and labour€0–8,000
Time0–13 h

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

Parts involved

knock sensorspark plug

Related codes

P2336P2338P2339P0324P0326P0302

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