Matjj87 Posted May 4, 2021 Share Posted May 4, 2021 (edited) Hi all, Have started to have an issue with the MMI control unit in my 2012 A5 (facelift model). It works fine initially then after about 10-20 minutes it freezes and the lights on the two silver buttons to the right of the large scrolling wheel flash. The controls in the steering wheel still work and the screen changes with it. I tried the three button reset, it does restart the MMI but doesn’t fix the issue. Only thing that seems to work is if I switch the car off for at least an hour. But again, it goes in about 10-20 minutes. Has anyone experienced this particular issue? Do you think replacing the MMI control module will work? any help would be greatly appreciated Edited May 4, 2021 by Matjj87 Changed spelling Quote Link to comment Share on other sites More sharing options...
Steve Q Posted May 7, 2021 Share Posted May 7, 2021 I'd advise a diagnostic check to see what fault codes flag up. It does sound like an issue with the head unit and a replacement might be required to cure the issue. Quote Link to comment Share on other sites More sharing options...
Matjj87 Posted May 7, 2021 Author Share Posted May 7, 2021 Thanks Steve. Do you know if I can just replace the control unit? Or would it require any type of reprogramming? Quote Link to comment Share on other sites More sharing options...
Steve Q Posted May 7, 2021 Share Posted May 7, 2021 Good question. I'm sure you'll need a digit code which should come with any radio you buy. But not sure if it needs coding to the car. Quote Link to comment Share on other sites More sharing options...
Matjj87 Posted May 13, 2021 Author Share Posted May 13, 2021 Just an update. Purchased and fitted a replacement MMI control unit but have the same issue. I have sent a few request to audio repair companies, so will wait to see what they come back with. But if anyone else are able to offer any advice, I would be very grateful IMG_1460.MOV Quote Link to comment Share on other sites More sharing options...
Obasa Posted May 14, 2021 Share Posted May 14, 2021 (edited) Hi Mathew - you could try contacting these people who may be able to assist you: https://www.audiworld.com/how-tos/a/audi-mmi-problems-diagnostic-423457 I hope you get it resolved. Regards Olu Edited May 14, 2021 by Obasa Quote Link to comment Share on other sites More sharing options...
Steve Q Posted May 14, 2021 Share Posted May 14, 2021 10 hours ago, Matjj87 said: Just an update. Purchased and fitted a replacement MMI control unit but have the same issue. I have sent a few request to audio repair companies, so will wait to see what they come back with. But if anyone else are able to offer any advice, I would be very grateful IMG_1460.MOV Sorry to hear a replacement unit didn't solve it. Has it been coded to the car? (If applicable). Quote Link to comment Share on other sites More sharing options...
Jmptrsn Posted August 6, 2022 Share Posted August 6, 2022 Did you ever found the solution? I'm having some trouble, it's not control unit fault either . But no buttons work and two flashing red lights, right of main knob Quote Link to comment Share on other sites More sharing options...
Matjj87 Posted August 6, 2022 Author Share Posted August 6, 2022 Yes. In the end I had to replace the main mmi unit. Trouble I had though was the part number on my unit was 8R2035666 and all the units I could find had a letter at the end, like 8R2035666G. I tried one with a letter at the end, as I found a few posts saying it shouldn’t matter but it did. I eventually found one the same as mine and it fixed the problem straight away. I did have to have the component protection removed though. I managed to get a used unit for 250 + 90 for the c/p removal. Audi had quoted me over 3k. I hope this helps Quote Link to comment Share on other sites More sharing options...
jonny102938 Posted September 1, 2022 Share Posted September 1, 2022 On 8/6/2022 at 7:20 AM, Matjj87 said: Yes. In the end I had to replace the main mmi unit. Trouble I had though was the part number on my unit was 8R2035666 and all the units I could find had a letter at the end, like 8R2035666G. I tried one with a letter at the end, as I found a few posts saying it shouldn’t matter but it did. I eventually found one the same as mine and it fixed the problem straight away. I did have to have the component protection removed though. I managed to get a used unit for 250 + 90 for the c/p removal. Audi had quoted me over 3k. I hope this helps Great news you are sorted, I have had the exact same issue with my A5. Where did you get your replacement mmi from and did it need recoding ? Also what did you pay please so I know what to look for Quote Link to comment Share on other sites More sharing options...
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