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-   -   Just got trans fail safe prog error on my 2000 540i no hint of driving problem prior. (http://www.bimmerfest.com/forums/showthread.php?t=707856)

Reeds 540 07-09-2013 11:44 AM

Just got trans fail safe prog error on my 2000 540i no hint of driving problem prior.
 
Sent from my SCH-I535 using BimmerApp mobile app

edjack 07-09-2013 01:35 PM

Get the codes read.

Reeds 540 07-09-2013 08:16 PM

Codes for trans fail safe program
 
A couple of these are old as I have needed a cam position sensor for a while, but I included all that came up. P0348 P174 P0600 P0171. Since last post the fail safe error went away when restarted, then returned after a few minutes. it is definitely going into some kind of safe mode as shifting is different. feels like its slowly easing into a higher gear from stop. also the Brake and ABS lights have come on and stayed on even when trans fail safe program went away. throw in speedometer and tachometer and temp gauge stopping from time to time. I did top off the Brake and trans fluid which were a little low, just at the low side limit markings. Battery holds a charge fine. we'll see what it does tomorrow. I prefer doing maintenance my self, and often replace a part or two for a likely problem, before spending the big $$$ on Mechanic. Thanks for any advice.

Reeds 540 07-09-2013 08:20 PM

Battery alternator
 
I researched several other posts about this warning, and they seemed to indicate alternator and battery as potential problems. I don' completely understand how this could be if Battery is holding a charge just fine and staying recharged wit normal use. If there is a fusible link or other related issue to check let me know.

HTK12 07-10-2013 03:07 AM

Quote:

Originally Posted by Reeds 540 (Post 7700901)
I researched several other posts about this warning, and they seemed to indicate alternator and battery as potential problems. I don' completely understand how this could be if Battery is holding a charge just fine and staying recharged wit normal use. If there is a fusible link or other related issue to check let me know.

I had trans failsafe due to failing battery. The battery did start the car just fine.. Battery resting voltage was ~12V, when it should be 12.4V+. Replaced the battery and haven't had issue since. These cars are really sensitive to electrical issues, so first check the alternator & battery.

What kind of scanner did you use? Which diagnostic port?

Reeds 540 07-10-2013 05:18 AM

I just had codes scanned a autozone. Not many service choices here other than dealer.

Reeds 540 07-10-2013 05:20 AM

Assuming the guys at autozone don't know how. what is the procedure for checking the resting voltage on the battery. I am wary of disconnecting it for fear of loosing codes to radio and other electronics. I am at least the third owner of the car and not sure they are available.

Reeds 540 07-10-2013 05:21 AM

I have a basic voltage meter at the house.

Burning2nd 07-10-2013 06:17 AM

Your looking or 12vdc when the car is off and nothing is turned on .

Your looking for 13.8-14.6vdc when te car is running (depending on load )

If you have a voltage load tester you can test the battery's performance when the car is off
"Load test"

m1gunr 07-10-2013 10:18 AM

my tranny issues started when the alternator was failing. Once replaced, issues went away.

HTK12 07-10-2013 12:06 PM

Quote:

Originally Posted by Reeds 540 (Post 7701284)
I just had codes scanned a autozone. Not many service choices here other than dealer.

So most likely their scanner can't read transmission codes. So get the codes pulled with a proper scanner. You'll need to use the 20 pin diagnostic port that is in the engine bay.

avu3 07-13-2013 11:23 AM

I'm another who had transfailure warning and limp mode as first signs of failing batteries and alternators.

Retrospectively, I knew how long my alternator was not working right based on progressively poor shifting.
I was able to pre-diagnose a subsequent alternator failure based on the trans performance

Rule that out, those are both much simpler fixes than the trans.

If you get the battery load tested on the car, don't do it at the jump points. Do it at the battery. The parts store testers seem to be tricked by the cable run.

Scott

rcmarty 07-13-2013 06:17 PM

Don't for get the visor test for a bad ignition switch

Martin

Reeds 540 07-14-2013 10:35 AM

Already replaced the ignition switch. Found a decent BMW Mechanic and left it with him. I had some front end parts replaced recently and since ABS and brake lights were also on he said that may be the issue. Still don't understand how a battery that is staying charged by alternator could cause the problem. Then again, I didn't understand how my wife using lighted vanity mirror could shut off radio and make steering wheel go up and down! I will post findings when repairs complete. Thanks again for help.

avu3 07-14-2013 06:58 PM

Quote:

Originally Posted by Reeds 540 (Post 7709514)
Still don't understand how a battery that is staying charged by alternator could cause the problem. Then again, I didn't understand how my wife using lighted vanity mirror could shut off radio and make steering wheel go up and down! I will post findings when repairs complete. Thanks again for help.

The Trans stuff and alternator/battery is from voltage irregularities. Caused by an alternator not putting out the right voltage/current and/or the battery not accepting the charge at the rate that it should.

The vanity mirror sounds like a short/shorted wires.

S


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