Powertrain, generic (extended)

P2336 Cylinder 1 Above Knock/Combustion Vibration Sensor Threshold

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

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)

Symptoms

  • Check engine light on
  • Knocking or pinging noise from the engine
  • Less power because spark is retarded

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

P2337P2338P2339P0324P0325P0301

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