Peugeot 308 Secret Menu Access

The secret menu is a low-level diagnostic interface built into your infotainment system. It is primarily used by engineers during production and by dealership technicians to quickly verify system health.

In the automotive world, this is often referred to as the "Engineering Menu" or "System Information Menu." On the Peugeot 308, it resides within the SMEG or NAC/Wave 4 infotainment systems.

Think of it as the "Task Manager" or "BIOS" of your car’s computer. It bypasses the pretty animations and rounded corners to show you raw data: voltages, GPS coordinates, antenna signal strength, RAM usage, and component test outputs.

Applicable to: 2014+ models with the 7-inch or 9.7-inch capacitive touchscreens.

The newest Peugeot 308 with the i-Connect Advanced system is more locked down. Peugeot has hidden the engineering menu deeper due to cybersecurity concerns (GDPR and UN R155 vehicle regulations).

To access it on the new 308:

Note: In the new model, you cannot change vehicle parameters. You can only view diagnostics logs and run speaker tests.

Most modern Peugeot 308s (2014–2021) use either the SMEG+ (entry-level) or NAC (Connected Navigation) head unit. The newest 308 (2022+) runs on the i-Connect Advanced system. Each has its own hidden portal.

Appendix A: Quick Reference Card

| Action | Result | |--------|--------| | Hold Settings icon + press Phone 3x | Enter secret menu | | Steering wheel left roller | Scroll up/down | | Steering wheel OK | Select submenu | | Power button (10 sec) | Exit / reboot |

Disclaimer: This document is for informational purposes only. Accessing engineering menus may void warranty or cause system instability. The author assumes no liability for unintended configuration changes.

The Peugeot 308 features hidden menus that vary depending on your infotainment system (SMEG, NAC, or RCC) and the vehicle generation. These "secret" menus are primarily used for system diagnostics, checking software versions, and performing resets. 1. Service/Diagnostic Menu (SMEG & NAC Systems)

This menu provides technical data about your navigation and infotainment hardware. Accessing the SMEG Menu (Older Models): Turn on the ignition and wait for the system to boot up.

Press and hold the Menu button (the physical button on the side of the screen) for about 5–10 seconds until the service screen appears.

Features: View software versions, map versions, GPS signal strength, and navigation demo modes. Accessing the "Spy Mode" / Expert Mode (NAC Systems):

Press and hold the Music (piano key) for roughly four seconds.

A window will pop up asking for a four-digit code. Enter 1111.

Features: Accesses various internal logs and system-level diagnostic lists. 2. Service Spanner Reset Menu

If you’ve performed your own oil change or maintenance, you can reset the "service due" spanner icon on the dashboard manually. MK2 Generation (2013–2021): Switch off the ignition completely.

Locate the reset button under the dials (marked with "000" or a spanner) and hold it down.

While holding, turn the ignition on (don't start the engine). A countdown from 10 to 0 will appear. peugeot 308 secret menu

Keep holding until it shows "=0" and the spanner disappears. MK3 Generation (2021–Present):

With the ignition off, press and hold the button at the end of the lighting control stalk (left side).

Press the Start/Stop button once without touching the pedals to power the dash.

Wait for the 10-second countdown to finish before releasing the button. 3. Quick System Reboot (For Frozen Screens)

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

Method: Press and hold the Music/Radio button (or the volume knob, depending on the model) for about 10 seconds until the screen goes black and the Peugeot logo reappears. Summary of Quick Codes Code / Holding Time SMEG Software/GPS Info Hold MENU (5s) NAC Expert Mode Hold MUSIC (4s) + 1111 All Screen Reset Hold MUSIC/Power (10s) All Service Reset Hold 000/Stalk + Ignition Hidden Menu - Peugeot Forums

Unlocking the Peugeot 308 Secret Menu: Hidden Diagnostics & Pro Tips

The Peugeot 308 is packed with sleek tech, but did you know there are "secret" menus buried under the surface? Whether you're driving a classic first-gen or the high-tech 2022+ Peugeot 308

, these hidden screens offer deeper insights into your car’s brain—from GPS signal strength to raw engineering data. How to Access the Secret Menus

Depending on your model and infotainment system, the "secret handshake" varies. Here is how to get in: SMEG / SMEG+ Systems (Common in 2013-2017 models): Turn on the ignition and wait for the system to load. Press and hold

the physical "MENU" or "SRC" button (usually for 5–10 seconds).

The hidden service menu will pop up, showing software versions, map data, and GPS signal strength. WipNav / RNEG Systems: button until the first menu appears. Press SETUP again, then simultaneously hold buttons 1, 2, and 3 to reach the deeper engineering menu. Modern i-Cockpit Systems (2021+ Models):

Press the screen near the music volume wheel for roughly 7 seconds. Enter the "Cheat Code" to access the engineering mode.

This menu displays real-time RAM usage, system temperature, and voltage. Hidden Diagnostic Features

Once you're in, you can see data that isn't shown on the standard dashboard: GPS Status:

View the exact number of satellites your car is tracking and the raw signal strength. System Health:

Check the internal temperature of the head unit and the current battery voltage. Service Reset:

If you've done your own maintenance, you can reset the service light by holding the odometer button while turning on the ignition and waiting for the 10-second countdown. Navigation Demo:

Some menus allow you to toggle a "Demo Mode" for the navigation system. Safety First: Words of Caution

While it's tempting to poke around, these menus are designed for technicians. Don't Change What You Don't Know: The secret menu is a low-level diagnostic interface

Modifying parameters in the engineering menu (like "Cheat Codes") can cause system crashes or disable features like the microphone gain. Stay Stationary:

Never attempt to navigate these menus while driving. Most modern Peugeot Connect

services require you to be safely stopped before making deep system changes. Are you trying to troubleshoot a specific system error , or are you just looking to customize your dashboard layout SMEG navigation hidden menu in Citroen and Peugeot

The Peugeot 308 (specifically models with the infotainment systems) features an "Engineering Mode" or secret menu used by technicians to view system diagnostics, GPS signal strength, and firmware versions. Accessing these menus typically requires a combination of button presses and a passcode. Mittns Peugeot Forum How to Access the Secret Menus

Access methods vary depending on your car's generation and head unit type: NAC Systems (Modern i-Cockpit, 2017+): Press and hold the

button (or the gear icon/cog) for approximately 5–10 seconds.

A keyboard will appear asking for a code. Common codes include: : Basic system info. : Privacy settings and TSM information.

: Often used as a confirmation code after entering other commands. SMEG Systems (Older 308 models, approx. 2013–2017): Press and hold the button or the button for 5 seconds until the screen changes.

This menu typically shows software versions, GPS satellite data, and hardware temperatures. RNEG Systems (First-gen 308): Turn on the ignition and wait for the system to boot. Press and hold the Once the first menu appears, press again while simultaneously holding buttons 1, 2, and 3 Key Features in the Engineering Menu System Diagnostics:

View real-time GPS signal strength and the number of connected satellites. Version Checks:

Verify the exact firmware and mapping versions currently installed on your vehicle. System Reboot:

Manually force the infotainment unit to restart if it becomes unresponsive. Demo Mode:

A mode used by dealerships to cycle through features for display. Peugeot France Peugeot 308 Overview & Tech Review

The current Peugeot 308 is noted for its premium shift, aiming to compete with the Volkswagen Golf and Mercedes A-Class. All-new Peugeot 308 GT full review 3 Dec 2022 —

To access the secret engineering or "Expert Mode" menu on your Peugeot 308

, you must use a specific button sequence on your infotainment system.

Here are the precise instructions to unlock it, depending on the generation of your vehicle: 🎵 The "Piano Key" Method (Gen 2 / SMEG & RCC Systems)

This applies to most second-generation Peugeot 308 models (T9 chassis, roughly 2013–2021) equipped with physical toggle or piano-style keys beneath the touchscreen:

Turn on the ignition so the infotainment screen is fully booted up.

Press and hold the Music/Audio piano key for about 5 to 8 seconds. Wait for the prompt asking you for a 4-digit security code. Enter the code 1111 and press confirm. Authentication:

This unlocks the Spy Mode / Expert Mode, where you can view detailed GPS data, software versions, and system logs. 📟 The "Setup Button" Method (Older SMEG Systems)

If your 308 does not have piano keys but features standard touch icons or side buttons:

Press and hold the "SRC" (Source) or "Setup" button for about 5 to 10 seconds.

If prompted for a code, try 1111 or leave it blank if it opens directly.

This opens up the system diagnostics, module parameters, and screen calibration cheats. ⚠️ A Quick Word of Warning

The parameters inside the Expert and Cheat menus are meant for factory technicians and software developers.

Do not alter settings unless you know exactly what they do, as changing system parameters blindly can glitch your navigation, audio balance, or infotainment operating system.

Use this menu strictly to check your firmware version or read unmasked vehicle statistics.

Engineering Mode: On some newer touchscreens, tapping the top-left corner several times or holding three fingers on the screen may unlock deeper menus used for display customization. What You Can See

While it's called a "secret menu," it is mostly for information rather than changing performance settings. Key features include:

Software Version: Essential for checking if you need a firmware or map update.

Internal Temperature: Monitor the temperature of the head unit to diagnose screen flickering or crashes.

GPS Status: See how many satellites the car is currently tracking.

Connectivity Logs: Useful for troubleshooting issues with Android Auto or Apple CarPlay. Important Warning

These menus are intended for diagnostic use. Changing settings within these sub-menus (especially those requiring codes) can occasionally disable features or cause the infotainment system to reboot repeatedly. It is generally safe to view information, but avoid changing "configuration" parameters unless you are following a specific technical guide.

Do you have a specific year or model of 308? I can give you the exact button sequence for your specific dashboard layout. Peugeot Tutorials | 308 and 308 SW 3D Navigation