18-045-26

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).**
• P08A6 - Gear Lever Position Sensor System - Multiple Sensor Correlation.
• P152F - Engine Hood Switch 2 / Engine Hood Switch 1 Correlation.
• P1129 - Closed Loop Fueling Not Achieved - Bank 2 Upstream.
• P0152-02 - O2 Sensor 2/1 Circuit High.
• P0158-02 - O2 Sensor 2/2 Circuit High.
• P2504 - Charging System Output High.
• P0563 - Battery/System Voltage High. Customers may also comment on one or more of the following:
• **The vehicle has a rough idle.
• The engine has a miss.
• Noisy valvetrain.
• "Service Transmission" message in the Instrument Panel Cluster (IPC) due to clutch slip detection with the transfer case in neutral. NOTE: Some customers may experience wheel spin or traction loss. In these situations, the Powertrain Control Module (PCM) may interpret the event as excessive clutch slip. To prevent potential clutch damage, a message may be displayed in the Instrument Panel Cluster (IPC).**
• Clutch is overheating.
• Clutch is slipping on engagement. M18 FSAR-TSB-7161 -2-
• Inability to accelerate uphill.
• Vehicle does not start.
• Vehicle is stuck in limp-home mode