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I'm not sure if this TSB will specifically address anyone's "hesitation" problems but since the TSB title just specifies Trouble Codes and relates to "cold" hesitation problems I thought it might be worth posting. Note that this applies ONLY to early model 2005 builds per the dates listed below.

TSB #: 18-031-04 REV. A

Date: November 12, 2004

Group: Vehicle Performance

MODELS: 2005 (LX) Chrysler 300/Magnum

Subject: Flash: Driveability Improvements MIL Illumination Diagnostic Trouble Codes P0116, P0139, P0159, P0197, U110B or U1402

Overview: This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software.

NOTE: This bulletin applies to vehicles equipped with a 5.7L engine (sales code EZB) and domestic market emissions (sales code NAS) that were built:

- On or before May 28, 2004
- Between July 1, 2004 and August 18, 2004.
- Vehicles with a 5.7L engine built on or before June 12, 2004 or between July 1, 2004 and August 18, 2004


Symptom/Condition:

This bulletin addresses one or more of the following conditions:

1. Eliminates stumble and hesitation when aggressively/quickly shifting between reverse and drive following a engine start-up.
2. Rough Idle after a hot start.
3. Long crank times on hot starts.
4. Intermittent oil pressure light illumination and chime while accelerating from a stop.
5. Improved shifting at low vehicle speeds.
6. Following a cold start, the coolant gauge stays at “C” cold and does not follow the increase in coolant temperature, with a TCM DTC U110B - Lost Engine Coolant Message or U1402 - Implausible Engine Temperature Signal Received or a PCM DTC P0116 - Engine Coolant Temperature Sensor Performance set, and the cooling fans running continuously. A key cycle would resume normal operation but the DTC will remain set.
7. Improved fuel economy for European NA1 emissions.
8. MIL illumination for DTC P0116 - Engine Coolant Temperature Sensor Performance.
9. MIL illumination for DTCP0139 - O2 Sensor 1/2 Slow Response.
10. MIL illumination for DTC P0159 - O2 Sensor 2/2 Slow Response.
11. MIL illumination for DTC P0197 - Engine Oil Temperature Sensor Circuit Low.

NOTE: To further improve shift performance it may be necessary to reprogram the Transmission Control Module (TCM) with new software. Perform Service Bulletin 21-009-04.