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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 08-01-2011, 06:33 PM   #1
Pwn Shop
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My Ride: 2003 325CI
Auto Transmission Ruining My Life

2003 325Ci has decided it wants me to be an unhappy person in general. I was driving it on the freeway a week ago, suddenly the car felt like it was gear hunting for a minute, then threw itself into tranny limp mode (red cog of death) and I had to flip it around and go back home. Since that time it has consistently gone into limp mode after about 20 min of driving (right about when the trans gets to running temp?) but beforehand, everything is hunkey dorey. Threw engine codes P0700 and P0734 (trans control unit and 4th gear ratio incorrect). I have replaced the battery to no avail, and the alternator is good too. Any advice would be greatly appreciated, thanks!
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Old 08-01-2011, 06:49 PM   #2
lilcdkey
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happened to me right when I bought my car, changed the battery and it was all good. hopefully you find a fix soon!
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Old 08-01-2011, 07:21 PM   #3
shadow 2
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Why would you make expensive repairs without knowing the cause of the problem? Have you consulted with a BMW specialist?
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Old 08-01-2011, 07:29 PM   #4
Pwn Shop
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The battery wasn't that expensive of a repair, that is all i have done so far. Also I took it to autozone and it tested bad before I replaced it.
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Old 08-01-2011, 08:24 PM   #5
shadow 2
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Misread and thought you replaced the alternator. I would still get it checked out by an independent BMW mechanic. Good luck.
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Old 08-01-2011, 08:45 PM   #6
cityjohn
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My buddy's Accord was doing this same thing. Turns out this is what was happening:
  • Car would drive great until warm.
  • Once it was warm it wouldn't shift (you'd come to a red light and couldn't take off after that).
  • Diagnosis was small bits of worn clutches in torque converter clogging the filter.
  • After the car sat for 10 minutes, the particles settled and the trans would operate normally until they got stirred up again enough to shut it down.


Ended up rebuilding the transmission.
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Old 08-02-2011, 12:31 PM   #7
Pwn Shop
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Update: Last night after work got home and dropped the pan, mostly because i wanted to check out the magnets. They were dome-shaped with how much sludge they had picked up. Changed the trans filter and replaced the fluid with Castrol multi-vehicle synthetic and so far, so good. Took it on a 30 min test drive and she did well. Hopefully this has fixed it! Thanks for the input, and it's definitely off to a bmw shop if it acts up any more.
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Old 08-02-2011, 12:53 PM   #8
FastHackem
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Just wondering, how many miles on your vehicle when you changed the fluid?
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Old 08-03-2011, 07:24 PM   #9
Pwn Shop
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99,315 . . . So close
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