Flash: MIL Illumination P1D73, P1CEA And/Or P0456 Includes Various Driveability Enhancements This bulletin...

Bulletin number

18-020-15

Component

Electrical system: software

Summary

Flash: MIL Illumination P1D73, P1CEA And/Or P0456 Includes Various Driveability Enhancements This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software. 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 Codes have been set: ? P1D73-00-AGS Performance ? P1CEA- Boost Side Evap Purge System Performance ? P0456- Evap System Small Leak Customers may also experience any of the following symptoms: ? Spark knock when using low octane fuel in the vehicle. ? Black smoke from tail pipe on initial start up during cold ambient temperatures. ? Uneven acceleration feeling under moderate to heavy throttle input ? Bump or surge noticed prior to engine reaching normal operating temperature ? Rough idle during A/C engagement/disengagement ? During periods of extended idle or short hot soak events and ambient temperatures below 15°F(-9°C), engine idle speed may increase to 1800 RPM if coolant temperature drops below 158°F(70°C). Condition is only present when the transmission is in Park. ? Low speed engine response improvements in city and traffic driving conditions Updating the PCM software will correct the condition listed above.

Owners of these vehicles have filed 175 complaints in the electrical category.