U0184 on Toyota
Lost Communication With Radio
U0184 on Toyota vehicles indicates lost communication with radio. Au7o has documented this code across 2 Toyota models — most commonly on Highlander, RAV4. 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.
Common Causes of U0184
- •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
U0184 on Toyota by Model
Toyota Highlander(1 issue)
- Entune Infotainment Touchscreen Freeze / Blank Display (MFD Lockup)2014-2019
Third-generation Highlanders with the Entune head unit commonly suffer the multi-function display freezing or going completely blank — the audio cuts out, the touchscreen and side menu buttons stop responding, and sometimes the screen stays dark on startup. Owners report it happening randomly and repeatedly. Toyota issued a Technical Service Bulletin and software updates for Entune lockups, but persistent units sometimes need replacement.
Toyota RAV4(1 issue)
- Multimedia Head Unit Goes Black or Is Hijacked by a Drive Connect Subscription Prompt2025
Separate from the instrument-cluster software recall, 2025 RAV4 owners report failures of the center multimedia head unit itself. Two distinct behaviors appear in NHTSA complaints. First, the infotainment display intermittently goes fully black while driving, taking navigation, backup camera feed and climate controls with it, and requires a forced reboot (typically a long press on the power/volume knob) to restore. Second, the screen spontaneously switches away from the active map or CarPlay view to a full-screen Toyota Drive Connect subscription solicitation while the vehicle is in motion, which owners report as a driver-distraction hazard. A related cluster describes the navigation system placing the vehicle at an incorrect location and the map "floating" during guidance, including when running Apple CarPlay. Confirmed NHTSA records include ODI 11697446 (03/2025, CarPlay showing incorrect vehicle location), 11749804 (02/2025, navigation misplacing the vehicle), 11752060 (12/2025, screen switches to Drive Connect), 11726075 (03/2026, "display screen frequently goes black"), 11738833 (02/2026, screen blank, lost directions) and 11755990 (08/2026, Drive Connect screen causing driver distraction). No recall covers this behavior as of August 2026.
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View U0184 across all makes →Frequently Asked Questions
What does U0184 mean on Toyota?▼
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 Toyota specifically, this code is documented across 2 models.
What causes U0184 on Toyota vehicles?▼
Common causes on Toyota: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U0184 on a Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have U0184 documented?▼
Au7o has documented U0184 on 2 Toyota models: Highlander, RAV4.