18-021-14

Flash: MIL Illumination P0456- Evap System Small Leak. Also Includes Various Driveability Enhancements This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) and Transmission Control Module (TCM) with new software.Both the PCM and TCM must be up to date for these changes to be effective. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the Technician may find that the following Diagnostic Trouble Code (DTC) has been set: P0456 - Evap System Small LeakCustomers may also experience any of the following conditions: (Applies only to Automatic Transmission) Engine may be difficult to start and/or re-start when operating in temperatures below 32°F(0°C)Driveability and Transmission Enhancements are also included with this software release. These changes include the following: (Applies only to Automatic Transmission) Improved evap purge strategy under high ambient temperatures Improved engine oil pressure sensor accuracyUpdating the PCM and TCM software will correct the conditions listed above.