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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 I’ve found that’s 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 I’m leaning towards it all being some common problem. I couldn’t 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? I’ve been working on cars since I was a kid but when the computers get involved I’m a little out of my element. Thanks for reading. |
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. |
A 5 Amp fuse costs $3.49 at AutoZone.
What else did the shop do for $120??? |
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.
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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
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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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