P2337 code meaning
Cylinder 2 Above Knock/Combustion Vibration Sensor Threshold
Powertrain system Generic code P23xx codes Check engine light
What P2337 means
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.
P2337 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 13 hours
- Clears after repairAfter a drive cycle
Symptoms of P2337
- MIL on
- Audible knocking, especially under load
- Reduced power or sluggish acceleration
Common causes of P2337
- PossibleInternal damage from debris left in the engine (Stellantis 2.0L PHEV)
- PossibleDeposits on piston or valves of cylinder 2
- Less likelyWrong or worn spark plug in cylinder 2
- Less likelyMechanical noise falling into cylinder 2's knock window
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Knock sensorSpark plug
What each part of P2337 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| 37 | The exact fault in that area. |
What to do next
- Note P2337 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2337
What does P2337 mean?
P2337 means "Cylinder 2 Above Knock/Combustion Vibration Sensor Threshold". P2337 is the cylinder 2 entry of the per-cylinder knock series P2336–P2347. It is a generic code, so it means the same on every make.
Is it safe to drive with P2337?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2337 fail an emissions test?
Yes, it can. P2337 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2337 to fix?
Difficulty: hard. A typical repair takes 0.5 to 13 hours of work. This is a job for a workshop.
Will P2337 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.