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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. Customers may also comment on the following: Vehicle fails emissions inspection testing This bulletin involves reprogramming the PCM with the latest available software.