Question about 2002 BMW 7 Series

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Have you heard of jumps knocking electrical system out

On vacation drove to destination with no problems car handled like the real driving machine as advertised. ready to return home keys would not open cardoors got in manually keys sliding out of ignition called for tow service, tow driver decided to jump first,car stared up he indicated let it charge for a while, I did pulled off and immediately steering was very stiff seconds after transmission light came own all gears blinking thencould not see what gear i was in then ignition failurelight was on. pulled to side of road called second tow. couldnt get car in gear so attempted a second jump would not start. eventually got to midway automotive (they work on BMW) needed new battery. there indicator lights that came on that were not there prior to this malfunction. they cleared the majority of them. but could not get the transmission light to clear as of now my car is not drivable you cant see what gear you are in cant see the speed etc. they suggested that I take the car to BMW dealer. I have spent a fortune on this car, and do not want to part with another cent. The mechanic said that when the car is jumped it can fry the electrical system. you may respond at

Posted by Anonymous on


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  • 231 Answers

Hi joybev-
There are several possibilities that come to mind. It sounds like a possible CAN bus communication. In simple terms if communication between the engine and transmission and other control units is interupted then the problems like this can occur. Several possibilities are the terminating resistor under the rear seat having corrosion, a communication failure created by the electric parking brake or poor connection at the transmission electrical connection at the transmission sleeve. If you can provide me with a current diagnostic read out I can try to assist you further.

Posted on Sep 04, 2014


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Posted on Jan 02, 2017


Paul W

  • 404 Answers


Hi Lisa!
This possibly is a immobilizer fault and I would be looking at the Fob/Zapper. The way the immobilizer works is to disable the starter and ignition system.
These fobs have batteries so try replacing them, if you still have the same grief it may need re-coding.
Phone or pop into your local BMW dealer with the Log book/title and ask for their assistance, It shouldn't be expensive unless the vehicle needs to towed/trailered but I'm sure a Girley smile should persuade someone to visit you at home to code the fob to the car.
Hope this FixYa's problem!
Paul 'W'
Onyer~EDson(:0) {#><U.K.

Posted on Jan 15, 2009


  • 2 Answers

SOURCE: dead battery and dead key. cant get in trunk to jump car

Pop open the hood (bonnet) on the left isde of the firewall there is a red/black battery connection so you can jump start the car without getting to the battery.

Posted on Apr 07, 2009


  • 76 Answers

SOURCE: Can a weak battery cause a BMW to misfire?

hello, if the vehicle ran with cable off one would ASUME alternator is ok! however, i bad diode in the aletnator would allow it to charge yet have a massive voltage draw as well, almost all of todays parts stores will do a free starting and charging test for you! a large voltage drop would rob your ignition of voltage causing your miss!.good luck, marty

Posted on Jun 07, 2009


Colin Stickland

  • 22485 Answers

SOURCE: 2003 BMW 525i--could an improper jump start blow a fuse?

new altenator,sounds like you put the cables on the wrong way round

Posted on Jun 14, 2009

Tommy Cude

  • 299 Answers

SOURCE: i also have a trans.failsafe prog.indicator light on my 2000 bmw

You have an alternator or battery concerne,low voltage caused all the other problems,Start with a battery,then have alternator tested.The failsafes are designed to keep from burning up solenoids and other electronic components.

Posted on Jun 19, 2009

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