Peugeot 308 Secret Menu 〈iPad PLUS〉

Select "HMI Test" (Human Machine Interface).

If you tell me your exact model year and which infotainment unit your 308 has (e.g., SMEG, SMEG+, or later systems), I can give the more precise button sequence for that variant.

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To access the "secret" or hidden menus on a Peugeot 308 , you typically need to use specific button combinations or "cheat codes" on the infotainment system. These menus are often used by technicians to view detailed system logs, GPS data, or software versions. Common Access Methods Expert/Spy Mode (NAC/RCC Systems):

Press and hold the Music/Audio piano key button for about 5 seconds.

When the prompt appears, enter the code 1111 to access "Spy Mode" or "Expert Mode". SMEG/WipNav Systems (Older Models):

Press and hold the SRC (Source) or Menu button for several seconds to bring up the system information screens. Navigation Cheat Codes:

On some units, you can enter codes directly into the navigation search bar. For example, entering ##SPYLOG or ##NAVWP can trigger specific diagnostic functions or display waypoint details. What You Can Find Inside peugeot 308 secret menu

System Diagnostics: View detailed logs of system errors and hardware status.

GPS Information: Check satellite signal strength and precise coordinates.

Software Versions: Verify the exact firmware version of your infotainment system for potential updates.

Configuration Settings: Some menus allow for changing map views or audio parameters not found in standard settings.

Caution: These menus are intended for diagnostic purposes. Changing settings within these "expert" modes can occasionally lead to system instability or accidental data deletion.

Are you looking to update your firmware or just curious about the system diagnostics for a specific issue?

Unlocking the Peugeot 308 Secret Menu: A Guide for Owners Peugeot 308 Select "HMI Test" (Human Machine Interface)

is packed with technology, but some of its most useful diagnostic and configuration tools aren't visible on the surface. These "secret menus" allow owners and technicians to troubleshoot issues, check software versions, and even test hardware components. How to Access the Secret Menu (By System Type)

Depending on the year of your Peugeot 308, you likely have one of three infotainment systems: , or the newer 1. SMEG & SMEG+ Systems (Typical for 2013–2017 Models) These systems are common in early second-generation 308s. Access Method

: Turn on the ignition and wait for the system to boot up. Press and hold the button for approximately 5 seconds. What You’ll Find Detailed software and firmware versions. Map versions for the navigation system. GPS signal strength and the number of active satellites. Technical hardware info like CPU usage and fan PWM.

2. NAC (Navigation Actuelle Connectée) Systems (Post-2017 Models)

Newer models featuring the capacitive touchscreen often use NAC or RCC systems. Access Method Press and hold the Settings/Cog icon or the "Music" button for several seconds.

A keypad will appear. For many NAC systems, you must enter a specific engineering code (like ) and confirm.

Note: Some systems require a secondary confirmation code like to proceed. These menus are often used by technicians to

: These codes are primarily for diagnostics. Changing settings here without expert knowledge can affect system stability. 3. New Peugeot 308 (2021+ i-Cockpit)

The latest generation uses a highly customizable system with

Yes, for diagnostics. If your backup camera is flickering, your radio is buzzing, or your GPS thinks you are in the ocean, the secret menu is the first place to check. It will tell you if the hardware is failing.

No, for "tweaking." Changing the vehicle's "Configuration" file (e.g., telling the car it has a power tailgate when it does not) will throw permanent error codes that require a dealer-level Diagbox tool to clear.

If you own a Peugeot 308 (particularly the second generation, 2013–2021, or the latest 2021+ model), you might feel like you know your car inside out. You adjust the climate control, pair your phone via Bluetooth, and check your fuel economy. But what if we told you that hidden just beneath the surface of your infotainment screen lies a treasure trove of diagnostic data, hardware tests, and configuration options?

Car enthusiasts and technicians call this the "Peugeot 308 Secret Menu" —also known as the Dealer Diagnostic Menu or Engineering Mode.

Accessing this hidden world doesn't require a $5,000 diagnostic computer. You can do it from your driver’s seat in under 60 seconds. But before you start tapping away, you need to know what you are looking for and, more importantly, which buttons not to press.

In this article, we will walk you through exactly how to unlock the Peugeot 308 secret menu, what you will find inside, and how to use it to diagnose faults, test your hardware, and even tweak hidden vehicle settings.