Transmission Problem 300C - Page 3 - Chrysler 300C Forum: 300C & SRT8 Forums
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post #21 of 24 (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 24 (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 24 (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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post #24 of 24 (permalink) Old 05-28-2017, 05:04 PM
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My 2008 300C did basically the same thing on the way to church 2 sundays ago, I stopped at a red lite and I heard a chime, ACC not availible, it went out but when I attempted to move it acted like it was in neutral and started to roll back, I shifted to park and back to drive and it still didnt want to move, a few more cycles and I got it to go but it wouldnt shift out of 1st, side of the road, on to church, attempted to back into a space, again like its in neutral, into park and then to reverse it moved, after church no problems. I took it to the dealer the next day, oh you have to have an appointment to have it diagnosed, ok 10 tomorrow. tomorow arrives I show up at 10 we'll call you if theres a problem, wait you made me wait an entire day just to park it in the lot and you'll get to it when you can, and oh by the way we want 139.00 to find out whats wrong, Im pissed but ok call me. Next day no call, the day after no call, I call them, leave a message, they finally call and say come get it and dont forget the 139.00, I get down there and its we were'nt able to duplicate the problem you described, dont know what went wrong, gimme my money. Then she tells me we need to crack the tranny and do a flush and hydro fluid swap along with filter, because the fluid smells burnt, and if we find any shavings we will have to replace the tranny, 4000.00, lady give me my keys, I will never let you touch my car again. HOW do you see/smell tranny fluid in a car that doesnt have a dipstick, or maybe they think Im the dipstick. you gotta crack it open to determine these things, which they did not. NO its just another stealership trying to get me to bite. Oh they wanted 270.00 more to do the flush/filter/swap, I took it to AAMCO and they charged me 150.00. TODAY the same exact thing happened at the same red lite, ACC NOT AVAILIBLE, it goes off, I try to go and it rolls back, side of the road, no matter how many times I shift back to park, it will not shift out of 1st, brought it back home, back to AAMCO tuesday, after reading these post Im confident of the problem, but I want to hear what they tell me. Nice to have prior knowledge before going in to shop. I had this happen to me on a Chevelle back in the early 70's I had just bought the car used the day before, took it back, in the shop 30 minutes, never had another problem, they said the kick down module had gone bad, and one other thing can I replace it myself. Thanks
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