transmission - a mind of its own!! - Page 2

lay3r3 · #1 10-20-2009, 06:39 PM

I had a similar problem and the stealer ended up replacing a wiring harness that was inside the tranny oil pan. Apparently the housing for the harness had failed so oil was getting into the wires. I couldn't reproduce it so had trouble getting it fixed. Eventually it finally got to the point that it was permanently screwed up so they were able to find it. Bizarre but has been solid ever sense so like 5 months.

HSV2006 · #2 10-20-2009, 10:22 PM

The harness and sensor is #24341423719 - I found it for less than $245. It is mostly in the transmission pan. Remove the oil - remove the pan. The harness has an external connector - remove it next. Next disconnect all the connectors. NOTE: At the front and rear of the transmission are 2 connectors the require removal of bolts holding the clips. You must remove the bolts else you will break the clips (I broke a clip). These are the pulse generators. Remove them and clean them. Last step - remove the retaining ring which holds the connector/harness in place. This is on the outside of the transmission. It is the last step before removing the harness. When you install the new harness - the retaining ring is the first thing to install once the harness is in place.
For a parts break out see realoem.com.

tonycajjo · #3 06-06-2010, 10:21 PM

Quote:

Originally Posted by HSV2006

The harness and sensor is #24341423719 - I found it for less than $245. It is mostly in the transmission pan. Remove the oil - remove the pan. The harness has an external connector - remove it next. Next disconnect all the connectors. NOTE: At the front and rear of the transmission are 2 connectors the require removal of bolts holding the clips. You must remove the bolts else you will break the clips (I broke a clip). These are the pulse generators. Remove them and clean them. Last step - remove the retaining ring which holds the connector/harness in place. This is on the outside of the transmission. It is the last step before removing the harness. When you install the new harness - the retaining ring is the first thing to install once the harness is in place.
For a parts break out see realoem.com.

you've inspired me. i think while i'm in there i may as well replace the pulse generators. i did get a speed sensor error, but i only use a generic OBD II scanner. there is also a crankshaft pulse generator external on the bell housing. i think i'm going to check that as well. (just make sure the connections are clean.)

i wish i had a lift.

cmartin248 · #4 11-23-2010, 10:38 PM

I want everyone to know that my initial repair was a temporary fix and did not fix the problem. What I thought was temperature sensors, were actually pulse generators (impedance coils). I guess while I was checking the wiring, I did enough movement of the wires to make the temperature sensor that is built into the wiring harness to makeup and work correctly for a while. The weird shifting pattern of high rpms followed by hard down shifting was cause by the transmission wiring harness internal temperature sensor. This sensor is a small looking resistor about 1/8 inch long and 1/16 inch in diameter that is crimped between two wires. When heated with a heat gun, the resistance increased. I bought the harness for $190 and had a local trans shop install it for $150. My X5 no longer has a transmission with its own mind. Hope this helps others...

IzzE53 · #5 10-26-2009, 02:44 AM

I had the same issue pressed BMW and got the tranny replaced! Must be able to replicate it with a tech! This took some patience and luck!

m5james · #6 10-26-2009, 01:14 PM

Hopefully BMW trained techs like killcrap or Weasel can comment on these temp sensors, the wiring harnesses, along w/ these servos and generators...this would be a substantial saving to replace a few bolts ons versus the whole transmission.

amacman · #7 10-26-2009, 10:42 PM

excellent thread here
carry on .

X Foomph · #8 10-27-2009, 03:48 AM

Quote:

Originally Posted by amacman

excellent thread here
carry on .

+1
I have similar probs albeit not that often and I've noted that it only happens (mostly) when I'm driving down a hill and touch the brakes whilst doing around 60 - 70kmph. Note: I only have a 3.0i, not a V8 as I thought this was only a V8 problem, not so. We have a lot of sneeky radar cop cars on the GC that park within other local cars and catch you as you come down these steep roads.

Ol' Bluey throws it down a gear the moment I just touch/tap the brakes as if to prepare to either slow down, overtake or come to a stop, weird.

I've come to understand the car and try not to run up and down said hilly road over the speed limit (usually 60kmph).

Strange how it doesn't happen if i'm running down these hilly roads at speed or under 50kmph.

As amacman said, carry on. Very interesting read.....

cmartin248 · #9 10-30-2009, 03:07 PM

Hey HSV2006,,, I found the harness for $150, but have not ordered it yet. It doesn't do it that often, but my problem is the same as yours and the temperature harness will probably fix it. Thanks for your help and will probably replace it and do the other cleaning and maintenance while I am in there.... your help is greatly appreciated.... thanks Clyde

Btmbl · #10 11-05-2009, 04:36 PM

This thread just saved me thousands of dollars =) Im out of warranty 03 X5 4.4 108k miles. I've had the exact problem HSV2006 described for about 2 or 3 months. I didnt want to take it in because I didnt want to consider paying $5k or $6k for a new tranny.

Anyway after reading the thread I printed it and took it to the shop. I was 90% sure it was my problem but I caught h*ll getting someone to do the job with out giving me all the "rickamorero". 1 shop wouldnt touch it, even after telling another shop this is the exact repair I wanted and wouldnt fault them if it wasnt fixed, they still wouldnt do it( I couldnt get them to hook it up to the computer with out doing "pin testing" and other cr*p I didnt think I needed). Apparently auto shops dont like customers to come in and tell them what they want done?

Any way I finally convinced my local dealer Moritz BMW to hook it up to the computer. Sure enough it was the temp sensor on the wire harness. Paid $215 for the harness it'll be here Monday and I should be good to go. Total repairs will come out to be about $700 =) The only difference in mine is that the seals werent broken so oil wasnt in the compartment, the harness was just shorting out. Long stort short if you're having similar issues check the wiring harness.

Thanks a bunch HSV2006 =)