18-049-25

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):
• **P08A6 - Gear Lever Position Sensor System - Multiple Sensor Correlation.**
• P1129 - Closed Loop Fueling Not Achieved - Bank 2 Upstream.
• P0158 - O2 Sensor 2/2 circuit high.
• P0152 - O2 Sensor 2/1 circuit high.
• P2504 - Charging system output high.
• P0563 - Battery/system voltage high. Customers may also experience the following:
• **"Service Transmission” message on in the Instrument Panel Cluster (IPC).**
• The engine runs rough. This bulletin involves reprogramming the PCM with the latest available software.