Modern vehicles, particularly the Peugeot 308 (2013–2021, T9 generation), contain complex infotainment and instrument cluster systems. Beyond the standard user interface, these systems feature a factory-embedded "secret menu." This paper provides a formal guide to accessing, navigating, and interpreting the hidden diagnostic and configuration menus within the Peugeot 308’s central display (SMEG or NAC/Wave 2/3 systems) and instrument panel. The purpose is to equip advanced users and technicians with the knowledge to retrieve real-time vehicle data, perform component tests, and view system versions without external diagnostic tools.
This is the holy grail for Peugeot enthusiasts. It allows you to see GPS satellites, raw speed data, battery voltage, and even update the firmware manually.
Steps to Enter:
What You'll Find:
This is the most reliable method for accessing diagnostic information on the T9 platform.
There are two primary methods used to access hidden menus on the Peugeot 308, depending on the model year and installed audio system.
The Peugeot 308 secret menu is a testament to the engineering depth hidden in modern French cars. From real-time sensor data to forced component tests, these codes transform your compact hatchback into a rolling diagnostic lab. peugeot 308 secret menu
Start with the infotainment engineer menu to check your camera quality. Move on to the climate sensor display to understand how your AC performs. And always keep the BSI reset procedure in your glovebox for electrical gremlins.
Remember: With great hidden menus comes great responsibility. Never change a setting you don’t understand, and always document the original state. Now go impress your fellow Peugeot owners—just don’t expect the dealer to applaud you for it.
Have you discovered a Peugeot 308 secret we missed? Join the discussion on Peugeot forums using the hashtag #308SecretMenu.
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 This is the holy grail for Peugeot enthusiasts
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: What You'll Find: This is the most reliable
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:
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