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Ross, Diagnostic and repair technician
Category: Car
Satisfied Customers: 1183
Experience:  Licensed diagnostic and repair technician
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My auto stop start has stopped working two days ago. Any i

Customer Question

My auto stop start has stopped working two days ago. Any ideas?
Submitted: 4 years ago.
Category: Car
Expert:  Ross replied 4 years ago.

techmachine :

Hi, welcome to Just answer! My name is Ross and i will help with your question

JACUSTOMER-kde87z2c- : Hello
JACUSTOMER-kde87z2c- : Hello Ross
JACUSTOMER-kde87z2c- : Well I cannot give good rating because you are not there
techmachine :

I am hear, dont worry!

techmachine :

Just wanted to ask a few questions to make sure i know whats going on with the auto stop.

techmachine :

Firstly, does the handbrake warning light work as normal?

JACUSTOMER-kde87z2c- : Yes as normL
JACUSTOMER-kde87z2c- : Sorry not got glasses on and hair dye on hair so spelling is rubbish!
techmachine :

No problem!

Right, there is a whole hand full of possible problems that can cause this to happen so its a bit tricky for me to pinpoint it exactly. The most common is the battery, if the battery voltage is slightly lower than normal, it will prevent auto stop as this puts a lot of drain on the battery. Most garages will do a free battery check, alternatively if you have a charger, give it a good charge and see if it starts working.

JACUSTOMER-kde87z2c- : So it would not be a fuse causing it?
techmachine :

No there is no single fuse that controls this system unfortunately. The battery is the most common cause, this often happens if you do a lot of short trips. otherwise it could be down to the clutch actuator switch or the ECU, i have known the ECU which is the main control unit to have problems, its usually a software problem in which case it needs to be plugged into a BMW Diagnostic system to check it and update the software if necessary. While it is plugged into this the clutch switch can be checked.

JACUSTOMER-kde87z2c- : Ok will have to take it to garage tomorrow then I suppose? See if they can sort it.
techmachine :

Unless you have a charger its best to take it to a garage. Most garages will do this for free anyway.

JACUSTOMER-kde87z2c- : Ok well wish me luck for tomorrow......
techmachine :

Good luck, hopefully it will be something simple.

If you need to get back to me, please feel free i will be happy to help. If you happy with my answer, please don't forget to rate me service! Thanks, Ross.