So am, as I still have not located / fixed the problem.
I've checked the TCM end and the connection is all secure with no signs of movement or play. I'm going to have to take it into a specialist auto electrician at this rate as my local Chrysler dealers are seemingly just fitters, with no concept on how to identify this electrical problem. They only seem capable of replacing expensive electrical parts one after the other until they maybe find the problem.
It's really pissing me off as I don't know what my journey is going to be like from one day to the next.
Last edited by Crazy_Mayes; 09-04-2012 at 12:27 PM.
My car is still showing the same symptoms as in the OP, but now it seems a bit more inclined to just stall while driving, especially at low speed.
Also, I've noticed that the cutting / stalling out occurs if I go over a small bridge, large speed bump, railway tracks, anything which gives the car a bit of vert / horizontal movement.
I've also read this thread and confirm that when my car momentarily cuts outs or stalls, the Voltage Light and Electronic Throttle Control (ETC) light flash on and off for a split second, sometimes followed by the engine malfunction indicator light coming on (but not always). Sometimes, after a RPM cut out, the Electronic Stability Program (EPS) Warning light and Electronic Stability Program (ESP) / Brake Assistant System (BAS) light come on together and stay lit for 3-4 seconds then go out.
Having read the linked post I'm wondering if I have a transmission fluid leak, the level is low and when I go over bumps or inclines etc this is causing the cut out / stall in the transmission system, which is then producing the Gearbox - Diagnose MT/AT - Fault Memory - U0100 - Lost Communication error???
What do you think? Is it plausable this could be the fault?
Not sure if this might help you, but I had a similar issue with my 06 srt8. It would randomly cut off and check engine light would come on saying it lost communication. Like your self I could not trace it to a certain action that would cause the problem. So After checking through the Internet I read that some of the 300 had issues with fuses not being tight enough and they eventually started to cause similar issues. I looked over all the fuses with no luck but did find the power connection in the engine compartment to be a bit loose. I snugged up all the fuses and re torqued the bolt down and the problem went away. My guess is wit huge vibrations the bolt would cause move and cause it to loose communication temporarily resulting I the shut down. Hope this helps you.
So After checking through the Internet I read that some of the 300 had issues with fuses not being tight enough and they eventually started to cause similar issues. I looked over all the fuses with no luck but did find the power connection in the engine compartment to be a bit loose.
Well, I had a look through the engine bay fuse compartment and yes a few did have a little bit of play in them, including No 11 - Autoshutdown/Powertrain Control Module (PCM) and No 14 Powertrain Control Modeul (PCM). I decided to replace all the micro blade fuses up front, and in doing so noticed quite a bit of what seems like electrical charing / discoloration on the old fuse blades. My power connection and earth seemed well connected with no play at all.
Probably nothing, but they won't have been making the cleanest connection. Anyway, with new fuse blades which seem to fit tighter I'll see if it makes any difference.
This is an interesting link on fuses. Specifically the comment, "At times the fuse blades are discoloured or oxidized from heat and corrosion. If this is the case, the fuse is inferior, and direct replacement with a quality fuse solves the problem."
Last edited by Crazy_Mayes; 09-18-2012 at 11:10 AM.
i did change many diff parts not help.wasting money.finally change PCM solve everything.
Originally Posted by Crazy_Mayes
I'm having this problem where my 2006 300c 5.7 Hemi keeps seemingly cutting out while driving. Best way to describe the problem is the RPM needled drops to zero for a second, engine stops instantly, then re-starts and carries on. Causes a massive jerk effect as engine power is momentarily on / off. Also, it occasional just stalls when I come upto roundabouts or traffic lights. Problem does not necessary occur under acceleration, can occur when cruise control is on, or when braking. Problem is random also, one day I can do 300 miles with no errors or problems. Next day, it can do it 5-6 times over 10 miles. Then it can run fine with no faults or issues for another 10 days. Makes a chime every time the RPM needle drops off. It does not always cause the engine management light to come on though.
I took it into my local non-Chyrsler dealer first who scanned the fault code(s) which came back as follows:
Gearbox - Diagnose MT/AT - Fault Memory - U0100 - Lost Communication. Control module part number 04692392AK. Hardware version 0.547. Diagnostic version: 53.
eOBD - Fault Memory - U0100 - Lost Communication with ECM / PCM A
P0700 - Transmission Control System (MIL Request)
They referred me to my Chrysler dealer who again scanned the engine management fault. It came back with one active engine management fault, that being P0700 (Transmission Control System). No mention of U0100 code. The dealer carried out a flash update on the transmission control system and told me to keep an eye on the problem. It didn't fix it.
Went back into Chrysler and the re-scanned engine management light fault. The same error was present, but they were not sure 100% on what the fault was. They wanted to replace the Transmission Control System for £650.00, but could not guarantee me that was the error!
Car runs on petrol / lpg - They tried to tell me that it might be a mapping issue, but I told them that the fault occurs on both petrol and LPG. Either way, the LPG ECU copies the petrol ECU and just mirrors the input, so they are talking rubbish in that respect. It's in the LPG garage tomorrow just for a quick once over before I take back to Chrysler.
Has anyone experienced the same problem? Does anyone have any potential cheaper solutions which I could run past my main dealers as alternatives to replacing the TCU? Could it be something as simple as a sensor issue between the TCU and the Gearbox or is it likely to be the TCU and should I bite the bullet?
I'm at a real loss with this problem, any help would be greatly appreciated.
Well, I've replaced all the discoloured and oxidized micro fuses under in the Front Power Distribution Centre (Fuse Box) now. The fuses I have fitted, although the same shape / size, the blades just seem to fit tighter and there is no play or movement in the fuses when seated. For the hell of it, I also replaced all the rear power distribution centre fuses, despite there not being much in the way of discolouration or oxidization, nor anything back there which would be linked to this problem. I did that because there was again lots of play and movement in the fuse blades.
I'm going to tempt fate here, but I've not had a single issue in just over 300 miles of sporadic running. I'll report back if I make it to a 1000 miles without any problems!
Ok, by way of an update my problem had seemed to have resolved itself after changing the fuses. I then had a failure just prior to xmas when the wipers and washers stopped working, and about 5-10 minutes later I had a stall / cut out while driving the vehicle as described in my OP. Fuses were all intact and there was power going to the motors and washers. I found it really strange that the stalling fault appeared in such close timing to this electrical wiper failure, especially after the fault seemingly going away for a decent chunk of time. The main Chrysler stealer’s eventually tracked a problem down to an electrical short in the clock spring, which was causing a fault in the forward control module. When they examined the clock spring and tried to put it back together it failed, with numerous dash lights coming on Electronic Stability Program (EPS) Warning light and Electronic Stability Program (ESP) / Brake Assistant System (BAS). As I mentioned in my previous posts, these had previously come on when driving for no reason after the engine had stalled.
I'm no electrician and my local Chrysler garage are about as much use as tits on a nun in terms of being able to tell me whether these faults were connected, but currently none of the U0100 or P0700 are showing on the vehicle.
What are your thoughts? Could the faults of all been connected to the electrical short in the clock spring and be the root cause of the issues in my OP.
Last edited by Crazy_Mayes; 01-10-2013 at 03:35 PM.
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