18-002-15

Flash: Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module (PCM) with updated software. During normal diagnostics a technician may find one or more of the following Diagnostic Trouble Codes (DTCs) present. ? U0140 Lost Communication With Body Control Module. (Attempting to clear this DTC will be unsuccessful.) ? P030X Cylinder X Misfire Detected ? P0300 Multiple Cylinder Misfire Detected Additionally the following enhancements have been implemented. ? Potential small improvement in fuel economy at higher altitudes. ? Potential improvement in high altitude engine idle RPM stability.