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whats it's mean when a transmission failsafe program from bmw x5 2001" on 2001 BMW X5

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whats it's mean when a transmission failsafe program from bmw x5 2001" i use to stop and restarted engine,and now my speed mph not workin, and i can't drop manuel no more,fransmission failsafe program keep blinking
(3) Answers
When I had this problem, it was because my alternator was faulty.
I replaced the both alternator and the battery and never had that problem again.
I'm having the same problem with my 2005 bmw x5. I've replaced the alternator and battery and still get that fault. I've hooked up a voltmeter and drove around till the fail safe warning comes in and I've noticed my voltage spikes to 17vdc plus. There may be a problem with the ecu. Might want to check it out.
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