I have a 2009 chrysler town and country. Today during a service appointment they made a pcm update 18-003-09. I assume that it was for my complaint of transmission surging at speeds between 30 to 40 mph.
Can anyone explain the update.

 

SUBJECT:
Flash: Driveability Improvements Or MIL Illumination Diagnostic Trouble Code P0452 -
Evap Pressure Switch Stuck Closed
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control
Module (PCM) with new software.
MODELS:
**2008 (CS) Pacifica**
2009 (JC) Journey
2007 - 2009 (JS) Sebring/Avenger/Sebring Convertible
2008 - 2009 (RT) Town & Country/Voyager/Caravan (Includes
International Markets)
NOTE: This bulletin applies to:
- **2008 CS vehicles equipped with a 4.0L Engine (Sales Code EGQ)**.
- 2007, 2008 JS vehicles equipped with a 2.4L Engine and Automatic Transmission
(Sales Code EDG or ED3 with DFF) built before June 19, 2008
NUMBER: 18-003-09 REV. C
GROUP: Vehicle Performance
DATE: June 11, 2009
- 2007, 2008 and 2009 JS vehicles equipped with a 2.7L and 3.5L engine (sales code
EER or EGF) built Before October 15, 2008 (MDH 1015XX)
- 2008 RT vehicles equipped with a 3.3L or 3.8L or 4.0L engine (sales code EGV,
EGL or EGQ)
- 2009 RT vehicles equipped with a 3.3L or 3.8L or 4.0L engine (sales code EGV,
EGL or EGQ built before May 11, 2009 (MDH 0511XX).
- 2009 JC vehicles equipped with a 2.4L engine (sales code ED3 or EDG) built before
August 20, 2008 (MDH 0820XX)
- 2009 JC vehicles equipped with a 3.5L engine (sales code EGF) built before
September 6, 2008 (MDH 0906XX)
SYMPTOM/CONDITION:
Some customers may complain that the engine stumbles, runs rough, has idle fluctuations
and/or surges at idle or there is a MIL illumination. Further investigation by the technician
may find DTC:
- P0452 - Evap Pressure Switch Stuck Closed

 

Thanks chrysler tech. I don't think that it corrected the problem,but I will continue to keep the dealer on alert.