Lost Communication With Navigation Display Module
Your vehicle's main computer lost contact with the navigation/infotainment display module, like a phone losing connection to its Bluetooth speaker. The navigation screen may go dark or unresponsive while the car still runs normally.
The main ECU communicates with the navigation display module via a CAN bus network using periodic handshake signals. When no valid data frames are received within a specified timeout window (typically 1-5 seconds), the ECU logs a communication fault. The system monitors signal voltage levels and message acknowledge responses.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| CAN Bus Message Response Time | 0.1-1 second response | No response or >5 second timeout |
| CAN Bus Voltage Level | 2.5-3.5V differential | <0.5V or >5V (short/open circuit) |
Code U0162 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, U0162 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.