trans. failsafe prog and error codes

[tonycajjo]

i just disconnect the battery and plan to leave it disconnect for a many hours. (5+), i don't know what this will do but i figured it couldn't hurt.

[tonycajjo]

i know i'm talking to myself a bit but figured i would post my findings. so the trans felt better, no lights, and worked well for a few miles, then it slipped when going into second. i also found that it seemed to shift on its own in manual. to me this point to the car not knowing how fast it is going. i did keep tabs on the speed but have before and didn't notice anything. (i think this is separate from anything i'm working with)

there are two pulse generators in my trans, item #6 on RealOEM.com BMW E53 X5 4.4i A5S440Z MOUNTING PARTS CONTROL UNIT
seems like a lot of work if i'm not 100% sure this is the speed sensor error p0721 is talking about.

[TwinsPoppa]

Hey man, I thought about you when I happened across this post. It rang a bell because you mentioned your battery had a low charge when you had it checked. Might be the alternator. See post #65.

http://www.xoutpost.com/bmw-sav-foru...tml#post747125

[tonycajjo]

Originally Posted by TwinsPoppa

Hey man, I thought about you when I happened across this post. It rang a bell because you mentioned your battery had a low charge when you had it checked. Might be the alternator. See post #65.

http://www.xoutpost.com/bmw-sav-foru...tml#post747125

i have already replaced the alternator once about 35K miles ago. i guess is could be going again but when i tested the voltage with the car running with my meter it read 13.85, i would have liked it to read a bit higher, around 14+ but 13.85 is pretty good. i actually didn't test it after i cleaned the connections. i should do that. also i didn't clean the crankshaft sensor connection. i know i'm delaying the inevitable of bringing it to a dealer / mechanic, but while i still have some things to try i will.

[tonycajjo]

my truck is out at AAMCO in East Hartford, they are going to rebuild the trans / torque converter and it will have a 36K Miles / 36 Month Warranty. its not going to be cheap but i knew that, it will beat dealer prices though. (they are going to open it up tomorrow and call me with a firm price) i've talked to many people about rebuilding my trans in the area and AAMCO was definitely lower in price than others and more willing to do the work. i guess having a 36K mile warranty is good enough peace of mind.

i looked into a used trans and they run anywhere from 1800-3500 and have 90K miles on them... (kind of a pointless purchase if you ask me.) (but i have seen so-called rebuilt ones, on ebay and other sites in the 1800-2500 range, but who knows with that. would be expensive mailing transmissions around.)

i love my X and can't really see myself driving anything else. (out of vehicles i can afford) looks like i'm gonna keep her for a bit longer now... i just hope nothing else major gives way.

while they are in there i asked to have the rear main seal changed and to take a look at the oil pan gasket. anything else in there that would be good to fix? i'm sure they know and will take care of me...

[maddrifter]

Originally Posted by tonycajjo

thanks for the replies. i think im going to do a couple of things when i get outta work today.

check the trans fluid level and look for leaks. (top off if necessary through item #1 from the following link RealOEM.com BMW E53 X5 4.4i A5S440Z ATTACH.PARTS/ PACKINGS )

clean the front speed sensor connections. and any other electrical connection on the trans (maybe they need replacement, but i'm not even sure which one the error refers to.)

reset the codes and hope for the best.

hi im new to this forum i have the same problem trans fail safe program and ive changed the trans fluid on my 2001 x5 diesel and im still gettin the same problem a friend of mine said that water may have got into the computer terminal in the engine bay because of the weather change here in london and told me to spray some contact cleaner and that might solve the problem. i will try this after work tomorrow fingers crossed