This bulletin applies to a few Chrysler vehicles, including 2008 Pacifica, 2009 Journey, 2007-2009 Sebring/Avenger/Sebring Convertible and 2008-2009 Town & Country/Voyager/Caravan vehicles. Customer complaints may include engine stumbling, rough running, idle fluctuations and/or surges at idle, and/or a MIL on. The technician may find DTC P0452 stored (Evap pressure switch stuck closed).
Using a scan tool with the appropriate diagnostic procedures available in TechCONNECT, verify that all engine systems are functioning properly. Any additional DTCs must be addressed before proceeding further.
1. Reprogram the PCM with the latest software. After reprogramming, clear any DTCs that may have been set in other modules as a result of the reprogramming. Clear the Variable Line Pressure (VLP) counters, found in the Misc Function menu for the PCM ECU. VLP clear counters must be completed on all models. Perform the Quick Learn Function, found in the Misc Function menu for the PCM ECU.
2. Type the necessary information on an authorized modification label and attach it near the VECI label.
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