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Parking Break Malfunction - Car Won’t Start

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608 views 3 replies 4 participants last post by  DrGER  
#1 · (Edited)
Just bought a 2012 Audi A5 2.0TDI Quattro, manual. Worked fine for first couple of days but now has a whole host of errors primarily parking break fault.

Despite this, once started, it runs absolutely fine it is just a pain to get started. It involves taking the key in and out and trying to turn it on over and over again (anywhere from 3-20 times) until you don’t get the dreaded beep and parking break malfunction error message and the engine starts. Just to clarify the car does not try and turn over at all until the time it actually works, it’s like the error is blocking something.

Once started I also usually get an ESC stabilisation error and a stop-start has been disabled error. But otherwise as I say drives perfect.

Once it has been turned on and driven, I can park up and turn it off and hop back in within a short time (up to say 30 mins) and it usually starts again first time. I notice at this time I can get the break pedal all the way to the floor before turning the car on, but if I leave it for a while I cannot, this seems to make a difference.

I have taken it to an Audi specialist garage and they have said a whole range of error codes are coming out and they can’t put the issue down to any one thing but most of the codes they have not been able to clear lead to the clutch. They’ve now put new clutch parts on back order which I have to wait weeks maybe months for.

This is frustrating because, although admittedly I don’t have much mechanic knowledge, I’m unsure on the diagnosis as everything I just mentioned has no relation to the clutch at all, it is usually the break pedal positioning or a wiggle around of the parking break that can get it started, not to mention the only error that comes up 100% of the time is parking break malfunction.

Any advice if you have faced something similar would be much appreciated. Thanks
 
#2 ·
do you know what all the error-codes are ??
for now we are looking into the dark.
the best thing would be to check the ECU's for errors yourself and give us the outcome.
this can be done with VCDS from Ross-Tech
 
#4 ·
@mattaudi5 -- You should get a report of current fault codes using a proper VAG aware diagnostic tool like Ross-Tech VCDS or OBDeleven.

For manual transmission cars, the clutch pedal needs to be depressed for starting. The clutch pedal position sensor -G476- is part of the clutch master cylinder assembly. The electrical connector is accessed from the engine bay:
Image

You might want to have the wire harness here inspected for damage.
Note also that the brake and clutch pedals are mounted to a common frame:
Image

Depressing the brake pedal likely causes some motion in the frame that can affect the position sensor integrated in the clutch master cylinder. --g