{"nhtsa_id":11020109,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-07-02","date":"2025-06-25","document_id":"18-034-25","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM","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.** **In addition, the customer may experience one or more of the following: ● Vehicle fails emissions inspection testing due to OBD catalyst monitor readiness.** ● Actual fuel economy reporting may not match the Instrument Panel Cluster (IPC). Other software enhancements: ● Calibration update to address EVAP system emissions monitor readiness status accuracy This bulletin involves reprogramming the PCM with the latest available software.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11020109-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11020109-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11020109","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":["P0420","P0430"],"topics":[],"vehicles":[{"make":"JEEP","model":"GRAND CHEROKEE","year_from":2019,"year_to":2019,"match":"exact","vehicle_ids":["2019_jeep_grand-cherokee"]}],"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":[]}