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Mysterious "Drive Off Assistant Failure"

jamesanderson84
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jamesanderson84 Member

jamesanderson84

Posted
Posted

About six months ago I started getting a warning every time I start the car and pull away - "Drive Off Assistant Failure".  

 

I checked it today and it is definitely not working.

 

I don't really care about the feature at all - I learnt clutch control 30 years ago - but I am getting ready to sell the vehicle and I know any buyer will want this fixed. 

 

Any ideas what causes this sub-system to start not working?  You think it is likely to be a mechanical or an electrical problem?

 

Any pointers or ideas appreciated.

 

2009 C4S w 37K miles.

 

Manrixx Member

Manrixx

Posted
Posted

Do you drive with your foot on the clutch pedal all of the time? I also heard that a switch inside the tranny can cause this light to come on.  I'm very interested in wha you find.

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JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

About six months ago I started getting a warning every time I start the car and pull away - "Drive Off Assistant Failure".  

 

I checked it today and it is definitely not working.

 

I don't really care about the feature at all - I learnt clutch control 30 years ago - but I am getting ready to sell the vehicle and I know any buyer will want this fixed. 

 

Any ideas what causes this sub-system to start not working?  You think it is likely to be a mechanical or an electrical problem?

 

Any pointers or ideas appreciated.

 

2009 C4S w 37K miles.

 

If you Google "Drive off Assistant Failure" you will find more than a few people with this issue.  Unfortunately, for some reason, this system cannot be disabled (to my knowledge). The system is also very complicated as it has to know what gear the car is in, is the car moving, is it on an angle greater than 5 degrees, etc.; so there are a lot of sensors involved.  I think you are going to need either a dealer or an indie with a PIWIS to help sort this out.

  • 4 weeks later...
jamesanderson84 Member

jamesanderson84

Posted
  • Author
Posted

I took the car to a Porsche dealer so they'd have access to the right diagnostic equipment.  They ran thediagnosis and concluded it was caused by a low voltage condition that occurred in the past (the car battery did go flat a while ago).

 

They charged the battery and told me the problem was fixed.  They made no charge for the work - which seemed like a good deal...

 

I drove off and two minutes later the warning late came on again.

 

A bit frustrating - another trip to the dealer upcoming...

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