P2336Cylinder 1 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
- The engine module listens to the knock sensors and assigns each vibration burst to the cylinder whose combustion falls into that crank-angle window, so it can retard spark on one cylinder alone. P2336 means the knock intensity attributed to cylinder 1 has exceeded the calibrated threshold. Stellantis lists P2336 to P2339 in bulletin 09-009-26 (May 2026) for the plug-in hybrid 2.0L turbo four (sales code ECX) in the 2024–2025 Jeep Wrangler 4xe and 2023–2025 Grand Cherokee: with the MIL lit and audible knocking, machining debris and casting sand are named as the cause and the whole engine is replaced. GM and Saab file a single knocking cylinder under P0324 instead (more than 8 s). Lasting knock can damage pistons, so the code should be followed up soon.
- What you may notice
- Check engine light on
- Knocking or pinging noise from the engine
- Less power because spark is retarded
- Likely causes
- PossibleEngine damage from machining debris or casting sand (Stellantis 2.0L PHEV, bulletin 09-009-26)
- PossibleCarbon deposits or hot spots in cylinder 1
- PossibleFuel with too low octane rating
- RareCylinder 1 running lean (injector delivering too little)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €0 – €8,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.