Question about 1994 BMW 3 Series

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Car shifts into trans module mode

This is actually for a 1994 BMW 740i.
Transmission might be slipping when this happens. Seems to only happen in cold months and when I shift into lower gears when cold out. Lately it has been happening in economy drive (normal).
Needs flush of transmission system? Owner guide just says that the transmission module has failed. When I turn car off for a bit and then restart it will perform like normal. Thank you for any advice you may have.

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  • alberts6 Nov 24, 2008

    Only happens in cold weather, like below 40 degrees.

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First lets look at what this moduel is looking at
this moduel sees line pressure and your gear selection P_R_N_D ect
and it has sensors or the input shaft and other gear sets.
so what we need to do is make arangement to have your codes pulled
so we can see to what extent the trouble could be.
otherwise we will all just be guessing.
and its your money that you are spending and
the object is to fix the problem with the least expence.
and with you beingt able to reset the code by turning off the ign switch tells me that its probily just a sensor problem.
let us know what code it has set
later
paul

Posted on Nov 25, 2008

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  • 276 Answers

The cars torque convertor maybe failing or slipping.

Posted on Nov 24, 2008

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  • BMW Master
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The first thing to do is change the fluid and filter, if the filter is dirty and the fluid worn out then the problem may be fixed by a simple service, don't just flush the trans, the filter must be changed, ask for a fluid and filter service.

Posted on Nov 24, 2008

  • yadayada
    yadayada Nov 24, 2008


    smarttech I disagree, this would not be a torque converter issue.

  • yadayada
    yadayada Nov 24, 2008

    The trans fluid and filter is the cheapest way to approach this, how will u know unless u try it?

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1 Answer

Hello, My 1994 BMW 740i is not shifting into 5th gear on automatic mode, it happens after it being driven for while and is warm, when cold it shifts gear till 5th gear normally, when it gets stuck on 4th...


IMO it's more likely that you have the wrong grade of ATF. It's very important to have the correct grade. The following site shows this:
http://www.nairaland.com/1364064/automatic-gearbox-problems
each car manufacturer has recommended grades of Automatic Transmission Fluid, BMW is no exception. the following website for BMWs may bring you more accurate data:
http://www.nairaland.com/1364064/automatic-gearbox-problems
Apparently CTSC is the supplier for BMWs via the web.
Generally auto gearboxes have drain plugs and filler plugs to enable oil change in routine maintenance. But I would definately go back to the garage where you had the last service and ask politely about the grade of ATF used, before considering an 'oil change'.
Good Luck

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1994 geo metro automatic transmission wont shift manuallywhen warm.


is it slipping,?
if the rpms rise and car dont speed up , in direct proportions that is slip.
is it?
if the engine has full power in 1st, the the transmission is bad.

not sure what shift manually means,
Drive to low? low to high. what? be exact in statements/
better stated what it does good and bad, and when. all modes.
are you saying the trans shirts perfectly in AUTOMATIC when cold./?

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I have a p1870 error code what do i need to replace to fix it


Your Trans is definately slipping even though it doesn't seem like it. If this just started, DO NOT, I REPEAT DO NOT!!!! drive the car in this state, even with the SES light off it's still happening. You WILL have to get a rebiuld if you continue to drive it like this. Here's the deal of EXACTLY whats happening.... and no, an auxillary cooler won't remedy this problem.

(BEFORE SES LIGHT)

#1 - Valvebody gets stuck closed, insufficient tranny fluid to cool transmission.
#2 - Trannsmission gets HOT due to insufficient fluid, and begins to slip (explains lack of accelleration power)
#3 - Computer detects slip after about an half hour of highway speeds and engages the FAILSAFE which applies MAXIMUM LINE PREASURE to push the fluid to the transmission although this does not work due to stuck valve.... MAX LINE PREASURE is actually what causes your harsh 1st-2nd gear shift... before this it SEEMS to run perfectly fine although it's not...
#4 - The First it detects it in a running cycle, the computer just activates the FAILSAFE with harsh shifting WITHOUT the SES light... however the SECOND time it detects it in the next running cycle...then...

(SES)

#5...You get an SES light with the code P1870 (Transmission Component Slipping or 4X4 Transfer box)... PLUS FAILSAFE mode which activates harsh 1st-2nd gear shifting...
#6 ...You turn car off, turn car back on and everythings running fine??? Nope, problems still there, you just resetted your computer which deactivates FAILSAFE mode until it detects another slip....

You will COOK your transmission if you continue to drive it like this... Trust me I have a 97 V6 with an A4 (Same tranny) and had to get it rebiult because it got so hot in there it fried all the shift solenoids, Ironically I just got it out today. The Sonnax Kit listed above is the common remedy to this issue... After the kit's installed the problem will never happen again...

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Check your transmission fluid which is usually done with the engine warm and running!
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jack
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