P2336 to P2347: cylinder above knock threshold
The knock sensors have detected that one cylinder, numbered 1 to 12, knocked beyond the threshold the engine computer accepts.
SeverityHighCarrying on can cause expensive damage, so deal with it now.
Can you keep driving?Only as far as the workshopWhat does P2336 mean?
Knock is the fuel and air in a cylinder exploding instead of burning smoothly, and it sounds like a metallic pinging under load. The engine computer listens for it and retards the ignition on the cylinder that knocks, costing some power. If knock keeps coming back beyond a threshold, it stores one of these codes. Sustained knock can damage pistons and spark plugs, so the causes are worth finding: low-octane fuel, carbon deposits, a lean mixture or an engine running too hot.
What causes P2336?
- Fuel of a lower octane than the engine needs
- Carbon deposits in the combustion chamber raising compression
- A lean mixture on that cylinder, from an air leak or a clogged injector
- An engine running too hot, or very hot intake air
- A loose knock sensor, or a mechanical noise mistaken for knock
What to check first for P2336
- Check which fuel grade was used against what the owner's manual requires
- Check the coolant temperature and the intake air temperature
- Read the fuel trims and the misfire counts for that cylinder
- Have the knock sensor's mounting checked for the right tightness
Can you drive with P2336?
Drive gently to a workshop, without full throttle or towing. If you hear a metallic pinging when accelerating, ease off, fill with the fuel grade the manual specifies, and have it checked soon, because sustained knock can damage pistons.
In states with an OBD-II emissions inspection, a car with the check engine light on fails the test until the fault is fixed.
Codes on this page
12
- P2336Cylinder #1 Above Knock Threshold
- P2337Cylinder #2 Above Knock Threshold
- P2338Cylinder #3 Above Knock Threshold
- P2339Cylinder #4 Above Knock Threshold
- P2340Cylinder #5 Above Knock Threshold
- P2341Cylinder #6 Above Knock Threshold
- P2342Cylinder #7 Above Knock Threshold
- P2343Cylinder #8 Above Knock Threshold
- P2344Cylinder #9 Above Knock Threshold
- P2345Cylinder #10 Above Knock Threshold
- P2346Cylinder #11 Above Knock Threshold
- P2347Cylinder #12 Above Knock Threshold
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
