BMW Forums : BimmerForums banner
1 - 5 of 5 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter · #1 ·
Hi all,

I've recently bought a 645CI Coupe 2004 model with pretty much every option installed.

It's an Auto box with Sport mode but not SMG.

It's a high miler at 79k mile on the clock and I think I've been ripped off by the previous owner...

Two weeks into ownership the screen for the sat nav turned off and wouldn't come back on. I checked the fuses and battery connections and all seemed good.

After half an hour or so of the car being off and turned back on everything worked until the following day.

After about 30 miles of driving I felt a shunt from the transmission and all the warning lights came on for Flat tyres, ABS offline, Dynamic drive failure, Active steering failure, ABS and Control systems affetced - Please drive moderately.

Whilst this was going on the screen would turn off and on and the speedometer stopped working.

This occurred on a motorway at high speed.

I pulled into a garage and checked tyres - all ok. After about 15mins I turned on the car and everything came back to life.

I got a local bmw specialist to check the faults and they reset the computer and told me to come back if it reoccurred due to there being too many faults onscreen to know which were relevant.

This weekend it happened again at 60-70 miles per hour as I was overtaking traffic in sport mode.

I felt a transmission shunt again and got similar errors to before exept the car felt like it was shaking from side to side, heavy steering and unresponsive pickup from the gearbox (possibly due to inactive dynamice drive/active steering etc?).

With the car being out of warranty I'm fearing the worst. Warnings for Dynamic drive/active steering failure and Control Systems being affected remain on now whenever the car is started.

Has anyone got any idea's please on what could be at fault?

I've posted this on an American forum site and members there suggested that the battery could be at fault or a duff alternator.

I've had the car checked at a small bmw garage (non main dealer) and their simplistic diagnostic box when plugged into the cars computer showed many errors but complained of overvoltage errors.

It also showed the alternator charging at around 14.3 to 14.4 volts which the mechanic said was slightly overcharging but that it shold be around just under 14 volts normally.

The problem is he doesn't know if a change of alternator will cure the fault and at £500 to replace inc fitting it's a scary proposition.

I'm going to trade the car in for an E46 M3 Cab asap as I'm not happy with it but I can't do a thing whilst the car is playing up. Any help would be gratefully received!

Many thanks

Paul
 

·
Registered
Joined
·
1 Posts
I have recently had exactly the same issues on my 04 645 cab 30k...

£177 to get diagnosed by BMW and they wanted £580 for the alternator. I managed to get BMW to pay for the part and had to pay £150 labour so still ended up costing £330!!
 

·
Registered
Joined
·
2 Posts
Discussion Starter · #4 ·
Thanks very much for the info guys it's much appreciated.

This ties in with what I've been hearing from specialists.

One recommended that to be certain that it was the alternator (and he thought that it was) I'd have to goto a BMW main dealer and get the car connected upto a GT1 machine in order for them to read the faults in shadow memory as well as the alternator charging details. Expensive stuff...hope this helps anyone else with the same problem in the future.
 
1 - 5 of 5 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top