08-027-25 REV. D

Flash: Motor Control Processor A (MCP A) Updates 6B3 Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTC)s:
• **P1E18-00 - Internal Control Module Electronic Park Performance.
• P1625-00 - Park Pawl System Failure.
• P0A78-00 - Drive Motor A Inverter Performance.
• P0A79-00 - Drive Motor B Inverter Performance.**
• P1626-00 - Park Pawl Motor Stuck. The customer may comment on one or more of the following symptoms:
• **Vehicle not shutting off and a draining 12V battery.
• Vehicle no start.**
• Wrench icon is illuminated on the Instrument Panel Cluster (IPC).
• Turtle icon illuminated on the IPC.
• Reduced power.
• Vehicle will not shift out of park. This bulletin involves reprogramming the IDCM, BPCM, MCP A, MCP B and the EVCU with the latest available software and then, if needed, performing a Wheel End Disconnect Position Learn routine