Peugeot 308 Secret Menu May 2026

Unlocking the Peugeot 308 Secret Menu: A Guide for Owners Peugeot 308

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. peugeot 308 secret menu

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. Unlocking the Peugeot 308 Secret Menu: A Guide

Note: Some systems require a secondary confirmation code like to proceed.

: 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 Vehicle: Peugeot 308 (Primary focus on T9 chassis,

“Why doesn’t the Peugeot dealer tell me about these?”

Because several of these functions (engineer mode, BSI reset, forced DPF regeneration) can be dangerous or responsibility-intensive. Dealers prefer you bring the car in for diagnostics.

2. Target Systems

  • Vehicle: Peugeot 308 (Primary focus on T9 chassis, 2013–2021).
  • Head Unit: SMEG/NAC/RNEG Navigation systems.

3.1. The Audio Button Method (Diagnostic Mode)

This is the most reliable method for accessing diagnostic information on the T9 platform.

  1. Ensure the vehicle ignition is on (engine running or accessory mode).
  2. Locate the audio control buttons on the steering wheel (typically the right-hand satellite).
  3. Press and hold the "Mode" button (often labeled with a speaker icon or the word 'Mode') for approximately 10 seconds.
  4. Release the button when the main screen flickers or enters a white-screen test mode.
  5. Immediately press and hold the "Volume Up" (+) button or the "Source" button.
  6. A white diagnostic screen with red text should appear, presenting a list of options.

4. Accessing the Peugeot 308 Central Display Secret Menu

Should You Use It?

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.