[johncrewe]

PLEASE HELP!

Sorry for the long post, please hear me out.

I have a 2013 A5 2.0T Quatrro (B8.5). I starting getting puddles at my divers feet (RHD). Found the ECU box in the Plenum Chamber wasn't even fastened to the firewall so water was pouring in (bought the car 2nd hand so history is unknown). Got the correct screws (6X30) to sort the problem.

Heres what I did:
Opened the ECU box with the torx bit (3 screws);
Pulled out the ECU (still connected the whole time);
Undid the fuse and relay box under the ECU to get to the bottom 2 screw locations;
Put it all together and tested - NO ELECTRICS at all;
Checked Fuses;
Found one 110A fuse on the battery terminal in trunk popped (pic attached). Cause unknown.
Replace fuse and electrics came back.

Now, when I put in key in and press to start, the needle sweep happens and then dead. No clicks, no nothing. Can't get the cart out of Park and I get Electronic Parking Brake Malfunction and Gearbox Malfunction - you can continue driving on the dashboard. The car worked fine up until me doing the screws.

Tried to do a VCDS scan and it says it cant connect to units but if I connect to the units individually, I get the errors as attached.

Any ides before I put a match to it 💥 ?

 

[Dippy]

If whatever you did caused enough of a surge to blow a 110A fuse then there may be others which also blew. Have you checked every fuse?

 

[johncrewe]

If whatever you did caused enough of a surge to blow a 110A fuse then there may be others which also blew. Have you checked every fuse?

Yip, checked in the engine bay, left and right side of dash and in the boot. Unless I've missed some hidden away?

 

[Gaharit]

Have you tried giving it to a specialist for testing? I do this often, they usually do it and help me a lot at such times. I used to have similar situations quite often until I turned to https://bates-electric.com/locations/minneapolis-mn/ It was these specialists who helped me get rid of such problems, because situations with electricity can occur quite often, right? That is why I believe that you need to have a professional contact on your phone and get rid of any problem as soon as possible