TrisGT Posted June 10, 2021 Share Posted June 10, 2021 Recently got my C34 S2 on the road. Loving it and it drives great despite all its issues. However I’m having constant trouble with the ATTESA system. The 4wd light is off on cold start, and the car drives great. After a while of driving after the cars warmed up, the 4wd light turns on. It’ll turn off if the car sits for halfa or so. when the light comes on, there’a a weird vibration under hard acceleration. I do have a wheel bearing that’s on it’s way out but I can’t see how that would cause an issue such as this. Link to comment https://www.sau.com.au/forums/topic/482503-4wd-light-after-driving/ Share on other sites More sharing options...
GTSBoy Posted June 10, 2021 Share Posted June 10, 2021 Do diagnostic. Investigate returned code. Link to comment https://www.sau.com.au/forums/topic/482503-4wd-light-after-driving/#findComment-7952742 Share on other sites More sharing options...
RBW49N Posted June 10, 2021 Share Posted June 10, 2021 The wheel bearing may be that bad it doesn’t read the wheel speed sensor properly? Link to comment https://www.sau.com.au/forums/topic/482503-4wd-light-after-driving/#findComment-7952754 Share on other sites More sharing options...
niZmO_Man Posted June 11, 2021 Share Posted June 11, 2021 Don't guess, get the ATTESA code read, or search here on how to get codes from it Link to comment https://www.sau.com.au/forums/topic/482503-4wd-light-after-driving/#findComment-7952786 Share on other sites More sharing options...
czeno Posted June 17, 2021 Share Posted June 17, 2021 Have you checked attessa fluid level inside the r/h panel at rear? With engine running too. 1 Link to comment https://www.sau.com.au/forums/topic/482503-4wd-light-after-driving/#findComment-7953032 Share on other sites More sharing options...
SLIXK Posted October 5, 2021 Share Posted October 5, 2021 (edited) I thought the 4WD turns on itself when it detects slip. Mine is also off on start up but turns on and off at certain times. Edited October 5, 2021 by SLIXK Link to comment https://www.sau.com.au/forums/topic/482503-4wd-light-after-driving/#findComment-7956500 Share on other sites More sharing options...
BiggestRon22 Posted November 10, 2021 Share Posted November 10, 2021 mines just always on, even once it warms up. it had a moment where it would turn off but its gone back to staying on all the time. abs light does the same too. Link to comment https://www.sau.com.au/forums/topic/482503-4wd-light-after-driving/#findComment-7957616 Share on other sites More sharing options...
Ben C34 Posted November 10, 2021 Share Posted November 10, 2021 On 11/10/2021 at 5:33 PM, BiggestRon22 said: mines just always on, even once it warms up. it had a moment where it would turn off but its gone back to staying on all the time. abs light does the same too. Your car is f**ked then. That's not normal mate. Link to comment https://www.sau.com.au/forums/topic/482503-4wd-light-after-driving/#findComment-7957621 Share on other sites More sharing options...
BiggestRon22 Posted November 13, 2021 Share Posted November 13, 2021 On 11/10/2021 at 1:06 AM, Ben C34 said: Your car is f**ked then. That's not normal mate. Any suggestions for what to do with it? Link to comment https://www.sau.com.au/forums/topic/482503-4wd-light-after-driving/#findComment-7957713 Share on other sites More sharing options...
Ben C34 Posted November 13, 2021 Share Posted November 13, 2021 Find out what is not happy. Get someone with a proper diagnostic device connect to the car and see what it says. Link to comment https://www.sau.com.au/forums/topic/482503-4wd-light-after-driving/#findComment-7957716 Share on other sites More sharing options...
Butters Posted November 17, 2021 Share Posted November 17, 2021 The atessa unit under the rear parcel shelf has a light on it. A series of blinks gives you a number that is a fault code. On this forum is the code numbers and the fault. It can range from really easy to solve to very damn hard. Mine fell in the hard category, multiple codes and after fixing some I just replaced the setup with a full race unit and never looked back Link to comment https://www.sau.com.au/forums/topic/482503-4wd-light-after-driving/#findComment-7957809 Share on other sites More sharing options...
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