{"vehicle":{"id":"2018_jeep_grand-cherokee","year":2018,"make":"Jeep","model":"Grand Cherokee"},"code":"P0301","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":3,"bulletins":[{"nhtsa_id":11018482,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-05-20","date":"2025-05-18","document_id":"09-011-25","mfr_campaign":null,"component":"ENGINE","summary":"\"Misfire Diagnostic Trouble Codes (DTCs), Rough Idle, Valvetrain Noise Customers may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0301 - Cylinder 1 Misfire. ● P0302 - Cylinder 2 Misfire. ● P0303 - Cylinder 3 Misfire. ● P0304 - Cylinder 4 Misfire. ● P0305 - Cylinder 5 Misfire. ● P0306 - Cylinder 6 Misfire. Customers may comment on one or more of the following: ● Rough idle. ● Valvetrain noise. \"","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11018482-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11018482-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11018482"},{"nhtsa_id":10220091,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-09-15","date":"2019-11-07","document_id":"1809419","mfr_campaign":null,"component":"ELECTRICAL SYSTEM; POWER TRAIN","summary":"Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following (DTCs) have been set:P06EF - Engine Restart Performance. P0456 - EVAP System Small Leak.If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT) to determine if a leak is present in the system. P0300 - Multiple Cylinder Misfire. P0301 - Cylinder 1 Misfire. P0302 - Cylinder 2 Misfire. P0303 - Cylinder 3 Misfire. P0304 - Cylinder 4 Misfire. P0305 - Cylinder 5 Misfire. P0306 - Cylinder 6 Misfire. In addition, customers may experience the following condition:Engine will auto stop and will not auto restart or the engine will auto start and this will result in a misfire, requiring customer to shift into park and manually restart vehicle. Other enhancements included in this update:Improvement for Engine Stop/Start (ESS) System.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10220091-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10220091-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10220091"},{"nhtsa_id":10169239,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-12-16","date":"2019-11-07","document_id":"18-094-19","mfr_campaign":null,"component":"ELECTRICAL SYSTEM; POWER TRAIN","summary":"Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following (DTCs) have been set:P06EF - Engine Restart Performance. P0456 - EVAP System Small Leak.If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT) to determine if a leak is present in the system. P0300 - Multiple Cylinder Misfire. P0301 - Cylinder 1 Misfire. P0302 - Cylinder 2 Misfire. P0303 - Cylinder 3 Misfire. P0304 - Cylinder 4 Misfire. P0305 - Cylinder 5 Misfire. P0306 - Cylinder 6 Misfire. In addition, customers may experience the following condition:Engine will auto stop and will not auto restart or the engine will auto start and this will result in a misfire, requiring customer to shift into park and manually restart vehicle. Other enhancements included in this update:Improvement for Engine Stop/Start (ESS) System.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10169239-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10169239-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10169239"}],"url":"https://open.wenmarpro.com/makes/jeep/grand-cherokee/2018/bulletins?code=P0301"},"related":{"components":[],"bulletins":[],"recalls":{"may_apply":true,"recalls":[],"lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null}}},"url":"https://open.wenmarpro.com/makes/jeep/grand-cherokee/2018/codes/P0301","note":"The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.","attribution":["Contains information licensed under the Open Government Licence – Canada."]}