Peugeot | 308 Secret Menu

While exploring the secret menu is generally safe, you should avoid changing any "Config" settings or "Rebooting" the system while the vehicle is in motion. Some "Cheat Codes" can factory reset your navigation, wiping your saved addresses and paired phones. Only use these menus to observe data unless you are an experienced DIY mechanic.

A screen labeled "Expert Mode" or "Engineering Menu" should appear. This menu provides detailed GPS satellite data, internal temperature of the head unit, and voltage readings. What Can You Do in the Secret Menu?

Consider the 308 not only as transport but as companion. The secret menu is a vocabulary of rituals—preparing the cabin in winter, selecting a drive mode for a coastal lane, tuning the audio to make a late-night radio song bloom. Each small adjustment is a sentence in a longer conversation between human and machine. The car answers not with words but with calibrated steering, warmed leather and the soft close of a hatch; the secret menu teaches the driver how to listen.

: Release the button immediately after hearing a distinct system beep or seeing the screen transition into a blue or grey engineering menu page. peugeot 308 secret menu

This is useful when you need to leave a pet (or a child) in the locked car and want to prevent the motion sensors from triggering the alarm. People have also used it to leave their car on car ferries.

In many cases, holding the Settings icon for 5-10 seconds or using a specialized diagnostic tool (like DiagBox) reveals advanced settings, including system diagnostics.

: In newer variants, pressing and holding the center of the touchscreen can reveal pin-entry screens for specialized diagnostic tools. Functional Capabilities While exploring the secret menu is generally safe,

Found primarily on Peugeot 308 T9 models manufactured between 2013 and early 2017.

If your infotainment screen becomes unresponsive, you can force a reboot without restarting the car.

Press and hold the (Source) or Menu button for several seconds to bring up the system information screens. Navigation Cheat Codes: A screen labeled "Expert Mode" or "Engineering Menu"

Press and hold the MENU button firmly for 5 to 7 seconds .

The "secret menu" of the Peugeot 308 represents a necessary bridge between the consumer-facing software and the engineering requirements of the vehicle. While PSA/Stellantis designs these interfaces to be hidden, their discovery by the enthusiast community provides a valuable tool for diagnostics and hardware maintenance. As vehicles become increasingly software-defined, the accessibility of such menus continues to shrink in favor of cloud-based diagnostics, making the documentation of these legacy access methods vital for the longevity of vehicles like the Peugeot 308.

This forces the system into "Component Test Mode."

| Function/Feature | How It Works / Where to Find It | | :----------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | Some owners report success by navigating to a hidden menu to update the satellite navigation system. Common reported methods include pressing Setup and then holding 123 (often fails, resulting only in a beep) or using a three-finger touch on the screen. | | Quick Settings via Swipe | For a faster way to change brightness or access diagnostics, simply swipe down from the upper edge of the touchscreen. This will reveal a list of quick settings. | | "Expert Mode" via Button Hold | If you have the audio system with physical piano keys, pressing and holding some toggle switches for about 10 seconds might trigger a system reboot or potentially bring up the Engineering mode. | | Driving Assistance & Personalization | Many personalization options, such as unlocking behavior, are in the "Driving assistance" menu. Navigate to it by using the piano key with the car symbol on it, then go to "Settings" and "Driving assistance" . |