{"nhtsa_id":11019618,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-06-18","date":"2025-06-13","document_id":"09-015-25","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":null,"summary":"\"Spark Knock/Engine Symptoms Customers may experience the following: ● Knocking or pinging noise coming from the engine upon acceleration. This bulletin involves cleaning the piston heads and cylinder head combustion chambers to resolve a spark knock condition being caused by oil intrusion through the PCV system.\"","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11019618-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11019618-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11019618","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"JEEP","model":"GLADIATOR","year_from":2020,"year_to":2022,"match":"exact","vehicle_ids":["2020_jeep_gladiator","2021_jeep_gladiator","2022_jeep_gladiator"]},{"make":"JEEP","model":"GRAND CHEROKEE","year_from":2018,"year_to":2022,"match":"exact","vehicle_ids":["2018_jeep_grand-cherokee","2019_jeep_grand-cherokee","2020_jeep_grand-cherokee","2021_jeep_grand-cherokee","2022_jeep_grand-cherokee"]},{"make":"JEEP","model":"WRANGLER","year_from":2018,"year_to":2022,"match":"exact","vehicle_ids":["2018_jeep_wrangler","2019_jeep_wrangler","2020_jeep_wrangler","2021_jeep_wrangler","2022_jeep_wrangler"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}