I have a 97 BMW 740i and the transmission fail safe mode is on. I have changed the blue shift solenoids, the fluid and the rear speed sensors. What...

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Hi Anthony,

Here are few thing to check that will contribute to the error that you mentioned.

1,bad alternator
2. dying battery
You can check those 2 by opening up OBC#7 on your cluster car idling should be around 12.2v-13.9v turn engine off but leave key postion. Battery should be 12.0v and higher
3. low transmission fluid.

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Seems like that the battery is about to die. How old is the battery? when was the last time you changed it?

if you keep on loosing charge on your battery, then there is an electrical issue somewhere. Have a mechanic checked the alternator and the wirings of your vehicle. 

bad alternator can also drain the battery. 

any more questions?

yes it will still charge the battery. But the moment that the vehicle is idle, it will start to drain the battery. 

yes.. the circuit diode iin the alternator is the one responsible for maintaining the charge of the battery. if that fails, then that will drain the battery slowly.

I believe that alternator is the main culprit. Have it checked or have the diode replaced inside the alternator and your problem should be fixed.

Any more questions?

just bookmark this page so that you can get back here easily and no need to add any payment. 

You are welcome. 

Dear Anthony, It was a pleasure helping you with your BMW issue today. Here is a summary of the resolution.
Issue identified : battery keeps loosing charge
Solution Implemented : chat with cx and told him the one of the main culprit is the alternator. the diode might be malfuntioning inside the alternator so when the vehicle is idle it still consuming electricity. cx will ahve the alternator checked. answer accepted. 
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