{"nhtsa_id":11031453,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-04-22","date":"2026-04-17","document_id":"18-048-26","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN; ENGINE","mfr_system":null,"summary":"Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0300 - Multiple Cylinder Misfire (Active or Stored status set during cold start catalyst heating). ● P0301 - Cylinder 1 Misfire (Active or Stored status set during cold start catalyst heating). ● P0302 - Cylinder 2 Misfire (Active or Stored status set during cold start catalyst heating). ● P0303 - Cylinder 3 Misfire (Active or Stored status set during cold start catalyst heating). ● P0304 - Cylinder 4 Misfire (Active or Stored status set during cold start catalyst heating). ● P0305-00 - Cylinder 5 Misfire (Active or Stored status set during cold start catalyst heating). ● P0306-00 - Cylinder 6 Misfire (Active or Stored status set during cold start catalyst heating). Customers may also comment on one or more of the following: ● The vehicle has a rough idle. ● The engine has a miss. ● Noisy valvetrain. This bulletin involves reprogramming the PCM with the latest available software.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11031453-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11031453-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11031453","components":[{"id":"engine","name":"Engine","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":["P0300","P0301","P0302","P0303","P0304","P0305","P0306"],"topics":[],"vehicles":[{"make":"JEEP","model":"WRANGLER","year_from":2023,"year_to":2023,"match":"exact","vehicle_ids":["2023_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":[]}