Peugeot: 308 Secret Menu

The secret menu is a hidden diagnostic interface built into the car’s infotainment system (such as the RT6, SMEG, SMEG+, NAC, or RCC units). Factory technicians use these screens to verify firmware stability, check GPS satellite connections, read internal temperatures, and diagnose Controller Area Network (CAN) bus errors. For an owner, it offers a window into the car's digital health. How to Access the Secret Menu (By Generation & System)

Certain firmware variants feature a text box labeled within the developer options. While entering benign validation codes reveals extra data, entering undocumented commands can disrupt system configurations.

Press and hold the toggle button (usually the first or second key from the left) for 10 seconds. peugeot 308 secret menu

Manufacturers include these menus so dealership technicians can quickly verify system health, check GPS satellite connections, and diagnose hardware faults without dismantling the dashboard. For the average owner, it offers a fascinating glimpse into the inner workings of the car's computer. How to Access the Secret Menu (Generation Guide)

If your built-in navigation map spinning out of control or losing your location, navigate to the GPS info screen. It displays how many active satellites your Peugeot 308 is tracking in real-time. If it shows zero satellites while parked outside, your roof-mounted shark-fin antenna or its internal wiring is likely damaged. 3. Hardware and Screen Diagnostic Tests The secret menu is a hidden diagnostic interface

Turn on the vehicle's ignition and allow the display screen to load fully.

Whether you drive a first-generation model (T7), the highly popular second-generation hatchback (T9), or the sharp third-generation model, accessing these hidden screens can help you troubleshoot issues and better understand your vehicle. What is the Peugeot 308 Secret Menu? How to Access the Secret Menu (By Generation

For newer models equipped with modern multi-page systems, access is gained through multi-finger touch options:

While it won't completely replace a dedicated OBD2 engine code reader, the secret menu displays communication errors between the screen, the radio module, and the central BSI (Body Systems Interface) computer. Safety and Risks: A Word of Caution

However, if you access the QWERTY keyboard cheat codes or deep engineering menus, unless you are an expert. Doing so can accidentally brick your infotainment unit, leaving you with a blank black screen that requires a trip to a dealership to re-flash using proprietary Peugeot software. Summary Cheat Sheet Infotainment Unit Trigger Action Best Hidden Feature SMEG / SMEG+ Hold Settings / SRC icon for 7 seconds Firmware version check & Cheat Code Keyboard NAC (Newer models) Hold Music or Nav Piano Key for 10 seconds Deep hardware temperatures & GPS diagnostics RT6 (Older models) Hold the Setup button for 5 seconds Direct audio module testing