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post #1 of 34 (permalink) Old 08-28-2012, 03:41 PM Thread Starter
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Unhappy 300c Cutting out while driving - Help!

I'm having this problem where my 300c 5.7 Hemi keeps seemingly cutting out while driving. Best way to describe the problem is the RPM needle 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. The dealer carried out a flash update on the transmission control system and told me to keep an eye on the problem. Does not appear to have fixed the problem.

Last edited by Crazy_Mayes; 09-07-2014 at 02:09 PM.
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post #2 of 34 (permalink) Old 08-28-2012, 03:54 PM
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You may read my post on low speed stalling. But, the symptons you described actually happened to me before. It was worse today on the way to work. My car is back at the dealer. The sevice rep agreed that it sounded light a PCM failure. If I hear any good word from the dealer I will post it here. Those symptoms are identical to what happened to me last time (about 2 weeks ago) and today.

Last edited by GoodGuy; 08-28-2012 at 03:55 PM.
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post #3 of 34 (permalink) Old 08-28-2012, 03:58 PM
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The U0100 code is generally set when the PCM loses communication with a major module, such as the TCM. It is used as a "map" of sorts and there is always an associated code that narrows the problem down to one area.

The P0700 is a legitimate code and focuses on the failure. Now I would ask the dealer whether or not they physically confirmed that there is no damage to the harness at the TCM end and that the connection is clean and secure. They should do that first before changing out modules.

Michael
2006 300C SRT8
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post #4 of 34 (permalink) Old 08-29-2012, 10:49 AM Thread Starter
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Well, it's been into the LPG dealer and he confirmed that there were no ECU errors on the LPG system and that everything from that prospective appeared in order. He isolated the LPG electrics to the injectors thus temporarily totally turning off the LPG and the car still produced the fault when running on petrol alone.
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post #5 of 34 (permalink) Old 08-29-2012, 10:54 AM Thread Starter
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Quote:
Originally Posted by MADDOG View Post
Now I would ask the dealer whether or not they physically confirmed that there is no damage to the harness at the TCM end and that the connection is clean and secure. They should do that first before changing out modules.
Maddog, can you describe where the wiring harness is routed and where the TCM unit is sat, or provide a photo so I can check the wiring / connection myself and clean the connector with electrical contact cleaner.

Last edited by Crazy_Mayes; 08-29-2012 at 10:58 AM.
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post #6 of 34 (permalink) Old 08-29-2012, 10:59 AM Thread Starter
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post #7 of 34 (permalink) Old 08-29-2012, 01:10 PM
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I bet you anything its the Camshaft position sensor, Just had the same thing happen to me, super easy to fix, it was like a $30 part from napa
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post #8 of 34 (permalink) Old 08-29-2012, 02:00 PM Thread Starter
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Originally Posted by 1904Chrysler300 View Post
I bet you anything its the Camshaft position sensor, Just had the same thing happen to me, super easy to fix, it was like a $30 part from napa
If it was that, wouldn't I be getting a camshaft related fault code like P0340, no cam signal at PCM? I don't have anything reading to suggest cam sensor issues.
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post #9 of 34 (permalink) Old 08-30-2012, 01:01 AM
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Quote:
Originally Posted by MADDOG View Post
The U0100 code is generally set when the PCM loses communication with a major module, such as the TCM. It is used as a "map" of sorts and there is always an associated code that narrows the problem down to one area.

The P0700 is a legitimate code and focuses on the failure. Now I would ask the dealer whether or not they physically confirmed that there is no damage to the harness at the TCM end and that the connection is clean and secure. They should do that first before changing out modules.
The dealer called me today and said they needed it another day. Said it was a communication error. That is just like MADDOG said. I will call them in the morning and ask that. thanks MADDOG.

OBTW they paid for a rental. 2012 Grand Cherokee Limited. Nicer inside than my 300C from 2006.
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post #10 of 34 (permalink) Old 09-03-2012, 02:00 AM
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Much of the money allotted to the 300 rework went to the interior. Like the rejuvenated interiors in other recent Chrysler redesigns, virtually everything you can see or touch inside is improved by an order of magnitude: the dash, the center stack, the steering wheel, the door panels and seats—the list goes on. And the materials are light-years better, too. The dash is soft, the buttons on the new steering wheel actuate with a satisfying click, and the HVAC knobs slip from detent to detent as if lubricated by a film of oil.
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