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7 Series - E38 (1995 - 2001)

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  #1  
Old 09-01-2015, 11:37 AM
michael79soto michael79soto is offline
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Join Date: May 2015
Posts: 41
Mein Auto:
Trouble with a code all of a sudden

I have a 2000 bmw 740il and all of a sudden this code popped up 31 gear monitoring any help would be appreciated thanks in advance
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  #2  
Old 09-01-2015, 04:41 PM
u.nanimous u.nanimous is offline
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Location: SE Michigan
 
Join Date: Oct 2014
Posts: 1,838
Mein Auto: 1999 740iS, 2001 330xi
How is it shifting? Smooth through all the gears?

How about when you put it in R or D, is there any delay before you feel the gear bite?

Have you noticed if your RPM's are higher than usual while driving?
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2005 Venture Extended LT - what else you gonna drive when you have 6 kids, cargo and still want better than 10MPG
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Old 09-01-2015, 05:01 PM
michael79soto michael79soto is offline
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Mein Auto:
Rpm higher hen usually no power etc on what you said

I was driving then came to a stop then the car had no power at all had to rest the codes then the car came back to life but wouldn't shift and high rpms it the tranny or sensors huh FML
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Old 09-01-2015, 06:48 PM
u.nanimous u.nanimous is offline
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Location: SE Michigan
 
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Mein Auto: 1999 740iS, 2001 330xi
Mine hasn't totally crapped out yet but it has made me do a lot of reading, so I don't have the experience but do have a bit of knowledge (when memory serves on my good days).

Do you have steptronic? If so, how does it shift manually?
How many miles?
Has the fluid/filter ever been changed?

Typically a low battery will cause a TFS before the battery even comes on, but your problem sounds like a real transmission problem. Higher than normal RPM's is likely the torque converter and shifting problems are often the valve body. Transmission issues can get expensive real fast so typically the first thing to do is change the fluid/filter (drain and refill - NOT "flush"). If the fluid is the problem you just saved $1500-$4000 over rebuilding/swapping the whole transmission, if it wasn't you are only out $100-$200. It has been said that changing the fluid can wreck the transmission (speaking of OLD fluid), but in cases like yours it may already be wrecked.

Typical codes are something like "P0123" to which you may get many responses. Your code of "31" doesn't fit that format but google will show something. I'm curious...dealership? That code is in hexadecimal so you could also try google with 49 or 049 (hex 31 = 3x16 + 1 = decimal 49).
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