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X5: 2008 x5 3.0 will not turn over. awd and dsc light on, brake…

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2008 x5 3.0 will not...
2008 x5 3.0 will not turn over. awd and dsc light on, brake pedal will not depress to start vehicle stopped with wheel turned deeply to the right charger on AGC bettery @90 charged
Submitted: 3 years ago.Category: BMW
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Answered in 1 hour by:
6/12/2015
BMW Mechanic: Steve, BMW Expert replied 3 years ago
Steve
Steve, BMW Expert
Category: BMW
Satisfied Customers: 25,929
Experience: BMW Expert
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does the car give any response whatsoever when trying to start?
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Customer reply replied 3 years ago
lights come on but that is all
BMW Mechanic: Steve, BMW Expert replied 3 years ago
and you would like to know possible causes for this? or something else?
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Customer reply replied 3 years ago
possible causes, enough to start and drive to dealer
BMW Mechanic: Steve, BMW Expert replied 3 years ago
if something has failed on your car, it will not be able to be started.
I can suggest possible causes and things to try, but there is no guarantee the vehicle still start as this is well beyond my control.
please let me know if you would like to proceed.
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Customer reply replied 3 years ago
proceed
BMW Mechanic: Steve, BMW Expert replied 3 years ago
I will provide an honest answer. I trust this will be appreciated. Please remember that a low rating PUNISHES me for being honest and that I receive nothing for my time until a positive rating is clicked.
I am providing this information in good faith. Please remember that a low rating PUNISHES me for being honest and taking time out of my day to share my expertise and try to help.
The first thing to do would be to check all fuses (especially fuse 5 on an X5). Sometimes a very random blown fuse can cause this. Also unhook the battery for one hour to reset all systems. Also, try locking/unlocking the driver’s door a few times using the mechanical key.
Assuming the fuses are good and the battery reset does not help, nor a jump or the key in door unlocking, then there are a few other things that can cause this. While not all can be trouble-shooted at home, I hope this information will be helpful to you and yield a possible solution.
1) bad key - try another one
2) bad brake light switch - make sure your brake lights work. If not, the switch is above the brake pedal.
3) shifter not fully in park (auto transmission only) - try moving it around a bit, try starting in both park and neutral
4) bad immobilizer (aka EWS or CAS) - nothing can be done, dealer equipment is required to fix. When this goes bad or out of alignment, the car does not get the proper signal that the correct key is present, and therefore, the car will not start and the starter will not be allowed to engage.
5) bad transmission position switch (auto transmission only, located on side of transmission, accessed from under car) - this is what signals the car that it is in neutral/park and is safe to start. Try rocking the car back and forth in park a couple times.
6) bad clutch switch (manual transmission only, located above clutch pedal) - this is what signals the car that the clutch is depressed and is safe to start.
7) dead starter/solenoid/relay - To verify, you would need to access the starter and verify if the start signal is making it or not. You can also try tapping on it with a pry bar or similar if you can get at it as this can free it up in some cases.
8) bad ignition switch/cylinder – also unlikely as you would generally not get all other functions / power to come on inside the car in that case
Of course, it could also always be something totally random like a wiring breakage or problem with the engine control computer or other control module, but this is unlikely and hard to predict.
The best path forward, if one of the simpler items above does not pan out, is to have the car scanned with a BMW scan tool that can check all systems live and determine where the start signal is dropping off / getting inhibited.
Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.
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