{"nhtsa_id":11020110,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-07-02","date":"2025-06-25","document_id":"18-035-25","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.** ● P0441 - EVAP Purge System Performance (for North America and Mexico markets only). ● P0456 - EVAP System Small Leak. NOTE: If DTC P0456 is present, use the wiTECH Small Leak Verification Test (SLVT) to determine if a leak is present in the system. **In addition, the customer may experience the following: ● Vehicle fails emissions inspection testing due to OBD catalyst monitor readiness.** This bulletin involves reprogramming the PCM with the latest available software.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11020110-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11020110-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11020110","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":["P0420","P0430","P0441","P0456"],"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":[]}