U0184 on Audi: How to Diagnose & Fix
Lost Communication With Radio
1 Audi model · 1 documented issue
U0184 on Audi by model: symptoms, diagnosis and fix
The 4M Q7's dual-screen MMI Touch Response infotainment head unit reboots on its own while driving - screens go black, the system restarts, and radio/navigation/phone drop out, sometimes several times on a long trip. A related and better-documented fault covered by Audi service bulletins: with the Audi Smartphone Interface, the MMI screen goes blank after a phone is plugged into the USB port, or freezes while Apple CarPlay or Android Auto is running. Owners also report the system degrading progressively when navigation is active with several devices on the WiFi hotspot until it hangs and resets.
Common Symptoms
- Both MMI screens go black and the system restarts while driving
- Screen blank after connecting a phone to the USB port
- Apple CarPlay or Android Auto freezes mid-use
- Radio, navigation and phone drop out momentarily
- MMI becomes progressively unresponsive on long drives
How to Fix
First have the dealer flash the MMI/MIB2 head unit and the Audi Smartphone Interface to the latest software level per the applicable service bulletin - most reboot and blank-screen complaints resolve with the updated firmware. Also update the phone, remove non-essential apps, and use a genuine data-capable USB cable, since a hung phone app can hang the interface. A 'reset all settings to factory' from the MMI system menu clears sporadic reboots for many owners. If the fault persists after software, the MMI head unit / MIB module itself is replaced.
Sources for this issue (1)
U0184 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does U0184 mean on a Audi?
U0184 stands for "Lost Communication With Radio." This network code means a module stopped receiving expected communication messages from the radio/audio module over the vehicle's data bus. When the radio module goes offline or its bus connection fails, this code is logged. On some vehicles the audio module also acts as a network gateway, so its loss can trigger several related communication codes. Symptoms are typically a dead or unresponsive radio/infotainment system; it does not affect drivability. On Audi it is documented across 1 model: Q7.
What are the most common causes of U0184?
The most common causes of U0184 are: Loss of power or ground to the radio/audio module, Blown radio fuse, Wiring or connector fault on the communication bus, Faulty radio/audio control module, Corroded or loose module connector, Network/bus wiring short affecting multiple modules. The specific cause varies by vehicle.
How much does it cost to fix U0184 on a Audi?
Repair costs vary widely with the root cause and Audi model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.