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2005 300C multiple codes

  #1  
Old 09-25-2018, 06:39 PM
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Default 2005 300C multiple codes

1st post. Trying to help my son.

He was pulling out of his apartment and the car died and would not crank again.

I came over and put my scan tool on it and got 3 communication codes.

U0100
U0103
U0121

From what Iíve found thatís a loss of communication to the TCM, ABS and Gear shift module all at the same time. It seems odd that they would all come up together and so Iím leaning towards it all being some common problem.

I couldnít find any bad fuses and the battery should be good (plus I had the cables on it from my truck).

Anyone have a place for me to start looking? Iíve been working on cars since I was a kid but when the computers get involved Iím a little out of my element.

Thanks for reading.
 
  #2  
Old 10-11-2018, 01:44 PM
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Well, I'll update just in case this helps anyone else.

I'm not familiar with this car at all (like I said, it's my son's) so I didn't know there was a second fuse box. Turns out there was a blown fuse there (number 29). $120 is expensive for a fuse but I was expecting something far worse when I dropped it off at the shop.
 
  #3  
Old 10-16-2018, 06:34 PM
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A 5 Amp fuse costs $3.49 at AutoZone.

What else did the shop do for $120???
 

Last edited by 2005 300 LIMITED; 10-16-2018 at 07:26 PM.
  #4  
Old 10-17-2018, 07:18 AM
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That was about an hour and a half of trying to find the problem. Initial thought was broken wire or maybe a different module that failed and was taking up more than its share of the communication loop.
 
  #5  
Old 10-17-2018, 08:53 PM
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you woos will prob not be over with that issue a fuse does not just blow for no reason a short to ground is still out there waiting to do this again
 
  #6  
Old 10-23-2018, 03:04 PM
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So far no new issue but I did tell him to grab a handful of fuses just in case he gets stuck somewhere.
 
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