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.
Medium severity. Can I keep driving?You can drive in moderation without pushing the engine. If you hear knocking, avoid full-throttle acceleration.
Cylinder 1 is numbered according to the manufacturer: check your engine's manual before working on it.
Symptoms
- Check engine light on
- Knocking or pinging noise from the engine
- Less power because spark is retarded
Most likely causes
- Engine damage from machining debris or casting sand (Stellantis 2.0L PHEV, bulletin 09-009-26)
- Carbon deposits or hot spots in cylinder 1
- Fuel with too low octane rating
- Cylinder 1 running lean (injector delivering too little)
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It affects emissions.
What each character of P2336 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 3: Ignition and misfires
- 36: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2336?
You can drive in moderation without pushing the engine. If you hear knocking, avoid full-throttle acceleration.
What causes code P2336?
The most common causes are: engine damage from machining debris or casting sand (Stellantis 2.0L PHEV, bulletin 09-009-26); carbon deposits or hot spots in cylinder 1; fuel with too low octane rating.
Related codes
- P2337Cylinder 2 Above Knock/Combustion Vibration Sensor Threshold
- P2338Cylinder 3 Above Knock/Combustion Vibration Sensor Threshold
- P2339Cylinder 4 Above Knock/Combustion Vibration Sensor Threshold
- P0324Knock/Combustion Vibration Control System Error
- P0325Knock/Combustion Vibration Sensor A Circuit
- P0301Cylinder 1 Misfire Detected
Sources
- static.nhtsa.gov: MC 11032844 0001
- saabwisonline.com: dtc p0324 p0326 p0331 p06b6 or p06b7
- en.wikipedia.org: Engine knocking
- law.cornell.edu: 13 CCR 1968.2
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.