Transmission Problem 300C - Page 3 - Chrysler 300C Forum: 300C & SRT8 Forums
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post #21 of 23 (permalink) Old 01-29-2013, 08:55 AM
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The speed sensors are located on the electrical portion of the transmission valve body and are the most common cause of a no shift condition in our cars. The valve body is a two piece unit comprising of a metal block of passages and springs (which never really 'fail' but do get dirty) and an electrical portion (conductor plate) that houses the shift solenoids and the speed sensors. This unit snaps onto the 'metal portion' of the valve body and is located under the transmission pan.... There are multiple solenoids and two speed sensors... usually the speed sensors go due to a poor design, these cause codes and no shift issues. Unusual for the shift solenoids to go but they definitely can! All are located on the conductor plate... my advice if your opening the trans to change a solenoid is to search 722.6 Conductor plate on Ebay and pick up a whole new conductor plate... they sell for around $150-350 (or $700 at the dealer!). Change out the solenoids from your old one (obviously replacing the diagnosed bad one if any) and put it back together... new fluid and voila!

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post #22 of 23 (permalink) Old 01-29-2013, 11:06 AM
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The TSB was for a leaky connector seal allowing fluid residue to appear on the ouside of the connector. I had mine replaced at a quality dealer (Allen Samuels Dodge in Katy, Texas) and if they charged me anything it was so little I don't remember it.

Doesn't seem related to your issues, though. Hope the situation improves. And remember some dealers are unscrupulous. I've got 2 "stealerships" right close, so I drive 23 miles each way for honest, quality service.


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post #23 of 23 (permalink) Old 01-29-2013, 01:37 PM
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Originally Posted by Enzomalik View Post
Does anyone know where the solenoid on transmission is code p0743 many thanks.
There are multiple trans solenoids in the electrohydraulic control unit including:


Signals from the transmission control module (TCM) are converted into hydraulic functions in the electric valve control unit. The RPM sensors, starter interlock contact, and transmission oil temperature sensor of the electric valve control unit supply the TCM with input signals. The solenoid valves are controlled by the TCM and trigger the hydraulic functions.
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