{"nhtsa_id":11034358,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-07-02","date":"2026-06-25","document_id":"18-062-26","mfr_campaign":null,"replaces":null,"component":"ENGINE; POWER TRAIN","mfr_system":null,"summary":"Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● **P0420 - Catalyst System Efficiency Below Threshold Bank 1. ● P0430 - Catalyst System Efficiency Below Threshold Bank 2.** ● P0456 - EVAP System Small Leak. Customers may also comment on one or more of the following: ● **Vehicle fails emissions inspection testing.** ● Pinging/detonation sound from the engine after warm up at 1000-1500 RPM at low speed. (EMEA and APAC Only). ● The vehicle stalls at low speeds and/or coming to a stop This bulletin involves reprogramming the PCM with the latest available software.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11034358-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11034358-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11034358","components":[{"id":"engine","name":"Engine","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":["P0420","P0430","P0456"],"topics":[],"vehicles":[{"make":"JEEP","model":"WRANGLER","year_from":2019,"year_to":2019,"match":"exact","vehicle_ids":["2019_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":[]}