18-048-26

Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):
• P0300 - Multiple Cylinder Misfire (Active or Stored status set during cold start catalyst heating).
• P0301 - Cylinder 1 Misfire (Active or Stored status set during cold start catalyst heating).
• P0302 - Cylinder 2 Misfire (Active or Stored status set during cold start catalyst heating).
• P0303 - Cylinder 3 Misfire (Active or Stored status set during cold start catalyst heating).
• P0304 - Cylinder 4 Misfire (Active or Stored status set during cold start catalyst heating).
• P0305-00 - Cylinder 5 Misfire (Active or Stored status set during cold start catalyst heating).
• P0306-00 - Cylinder 6 Misfire (Active or Stored status set during cold start catalyst heating). Customers may also comment on one or more of the following:
• The vehicle has a rough idle.
• The engine has a miss.
• Noisy valvetrain. This bulletin involves reprogramming the PCM with the latest available software.