Audio Voice Module Not Responding
The vehicle's audio voice module (used for navigation, phone calls, or voice commands) isn't communicating with the main computer. It's like a passenger who stopped answering when the driver tries to talk to them.
The main ECU monitors serial communication (CAN bus or proprietary protocol) with the audio voice module at regular intervals. It checks for acknowledgment signals and data handshakes from the module. If no response is received within a specified timeout window, a fault is logged.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Module Response Time | 0-500 milliseconds | No response or >500ms timeout |
| Communication Bus Status | Active with periodic handshake | Bus timeout or missing acknowledgment frames |
Code U2019 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, U2019 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.