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MMI keeps resetting - fault

Gilly12345 Jun 15, 2020

  1. Gilly12345

    Gilly12345 New Member

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    So recently my MMI on my PFL Audi A3 has been resetting intermittently.

    Once the car has turned on, the MMI will initialise and start, after approx 1 minute it will shut itself down, before restarting a minute or so later.

    This only happens once every 2/3 start ups and I can’t identify what is making it do it sometimes and not others. On the time’s it starts up normally, everything works as it should.

    On the times it is resetting, after cycling the reset about 4/5 times it will continue to work as normal.

    I’ve checked all the connections on the rear of the unit and have also tried disconnecting the battery for 15 mins as a hard reset but nothing seems to work. I’ve had a search around the forums and can’t find much that matches the code / my symptoms.

    Fault code is ‘66052 - infotainment CAN Bus (SAE CAN Bus E)’

    Could it be something as simple as a software update to fix?
     
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  3. DJAlix

    DJAlix VAG Car Coding™ Limited Site Sponsor Gold Supporter VCDS Map User VAG Can Professional ODIS (Offboard Diagnostic System)

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    Possible CAN wiring issue. This is a "performance" related message, ie because there are issues within the network the "service" is degraded.
     
  4. Gilly12345

    Gilly12345 New Member

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    Is this something that has a relatively simple fix? Or should I just take it to a main Audi workshop?
     
  5. DJAlix

    DJAlix VAG Car Coding™ Limited Site Sponsor Gold Supporter VCDS Map User VAG Can Professional ODIS (Offboard Diagnostic System)

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    Hard to tell. Personally I would look to having the vehicle scanned via a specialist in order to get a true idea of what's going on. If you are in or can get to north London I can assist.
     
  6. Gilly12345

    Gilly12345 New Member

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    I was trying to work out why it was only resetting on start up. After driving for 20 minutes it usually finishes it’s resetting loop and works fine.

    I thought potentially it is a battery issue, I’ve checked the voltage and it’s at 11.9 resting and 13.2-13.7 whilst running? This sounds low to me, especially at resting, could this be the reason?

    Although I’ve never had an issue with turnover, I jump started my car and it seemed to work instantly and didn’t reset. Going to try again in the morning to make sure this isn’t just a fluke.
     
  7. Khufu

    Khufu Well-Known Member

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    could it be a physical issue like a dry joint on the board for the cooling fan etc?
     
  8. Gilly12345

    Gilly12345 New Member

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    Changed the battery based on my thoughts above and it’s fixed it instantly!
     
    Khufu likes this.

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