08-253-24

"Flash: Hybrid Control Processor (HCP) and Auxiliary Hybrid Control Processor (AHCP) 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):
• **P0A78 - Drive Motor A Inverter Performance.
• P0A79 - Drive Motor B Inverter Performance.**
• P0A33 - Drive Motor B Temperature Sensor 1 Circuit High.
• P0A2D - Sensor Power Supply 1 Circuit High
• P215B - Vehicle Speed Output Shaft Speed Correlation.
• P0C4A - Drive Motor A Inverter Over Temperature.
• P0E15 - Hybrid-Ev Battery Pack Coolant Heater A Control Performance.
• P1AFE - MCPB Improper Shut Down.
• P1AF8 - MCPA Control Module Shutdown Performance.
• P0513 - Invalid Skim Key.
• U151A-87 - Hybrid Control Processor Secret Code-Missing Message. Customers may also experience one or more of the following:
• **Message on Instrument Cluster stating: ""Vehicle shutting down in two minutes"".**
• The scheduled charging does not occur on desired schedule.
• Vehicle does not start when pushing ignition switch with no MIL for DTCs P1AFE and P1AF8 (pending DTCs).
• Vehicle does not start when pushing ignition switch with DTCs P0513 and U151-A87 (stored or active).
• Scheduled charging start/end does not align with displayed time (ex: 12:05 pm end time on radio, but charging ends at 12:06 pm).
• Scheduled charging does not start following a power outage.
• Scheduled Cabin Conditioning (SCC) feature will not function properly if they schedule the departure time in between 50 minutes to 480 minutes at extreme cold ambient temps below -24°C (-11 °F).
• “Charge Now” soft button does not always work.
• The vehicle will get a rough engine spin-down, and then “Service Charging System” warning and shutdown if the vehicle is quickly re-cranked after the initial key crank.
• Unable to pass a smog check for certain states that require no DTCs present (stored or active).
• Vehicle shutdown (MIL set) if the acceleration pedal is 100% and the vehicle is on ice.
• Vehicle may not have a successful second remote start if customer happens to request it immediately after first remote start without letting the vehicle sleep while at low High Voltage (HV) battery State of Charge (SOC).
• Vehicle may not achieve propulsion through a cold key crank if the HV battery was not conditioned using thermal periodic wake-up feature at critical cold temperatures around -33 °C (-27 °F) even if the vehicle was left plugged into a charger for an extended period of time. In addition, the following software enhancement is available:
• Corrections to allow the vehicle to clear the permanent fault codes. This bulletin involves reprogramming the HCP/AHCP, also known as Power Inverter Module (PIM), with the latest available software."