Peugeot 307 Radio Code — Unlock It Online

Turn the ignition on in your Peugeot 307 and the radio display greets you with CODE — a familiar scenario after any battery work. The 307, built between 2001 and 2008, was fitted with Philips/VDO-manufactured head units under the Peugeot RD4 and RD43 names. This guide walks you through finding the serial number on these specific radios and entering the correct unlock code, so you can be listening again in under ten minutes.

Why Does the 307 Radio Lock?

Peugeot's anti-theft strategy requires the RD4 and RD43 head units to request a PIN code whenever they lose power. A battery change, a flat battery, or even a few minutes of disconnection during servicing is enough to trigger the lock. The radio is fully functional once the correct code is entered — there is no lasting damage to the unit.

How to Find the Serial Number on a Peugeot 307

The RD4 and RD43 use a C7 barcode serial printed on a sticker attached to the unit. There are two ways to access it:

Button combination (display method): With the ignition on and the CODE prompt visible, press and hold presets 1 and 4 together for approximately two seconds. The display will scroll a long alphanumeric string — this is the serial number. Write it down carefully; every character matters.
Physical label: Remove the radio using a pair of DIN extraction keys or a flat trim tool to unclip the 307's fascia panel. The serial sticker is on the top surface of the unit and begins with the characters associated with the C7 format used across the Peugeot/Citroën range.

With the serial in hand, get your Peugeot 307 radio code online — delivery by email usually takes only a few minutes.

Entering the Code: RD4 / RD43 Button Method

The RD4 and RD43 use the four numbered preset buttons to build up the code digit by digit:

Ensure the ignition is on and the display shows CODE.
Press button 1 repeatedly until the first digit of your code appears on the left of the display.
Press button 2 repeatedly for the second digit, button 3 for the third, and button 4 for the fourth.
Press and hold button 5 (or the track-forward button, depending on trim) to confirm the code.
If accepted, the display will briefly show OK or the radio will resume normal operation immediately.

Take care not to rush — each button press cycles the digit upward. If you overshoot a digit you must cycle all the way round again.

307 Generation Overview

Variant	Years	Head Unit	OEM Manufacturer	Entry Method	Max Attempts
307	2001–2005	RD4 / RD43	Philips/VDO	Buttons 1–4 + confirm	10
307 Facelift	2005–2008	RD43 / later RD45	Philips/VDO	Buttons 1–4 + confirm	10

The facelift model (2005–2008) retained fundamentally the same radio architecture but some late examples were fitted with the RD45, which adds MP3 and auxiliary input capability. The code retrieval and entry process is identical across all three variants.

Troubleshooting the Peugeot 307 Radio

CODE displayed: Standard locked state — enter your four-digit code as described above.
WAIT: You have entered an incorrect code. The RD4/RD43 will impose a temporary lockout lasting approximately 30 to 60 minutes. Do not attempt further entries during this window.
Dashes cycling slowly: The radio is counting down its lockout period. Leave the ignition on and wait.
Display blank after entering code: The code was rejected. Check you noted the serial number correctly — in particular, confirm whether any characters are letters or numbers (the digit 0 versus the letter O is a common mistake on the C7 barcode label).

If you have exhausted your attempts, the radio enters an extended lockout. In this case, switch the ignition fully off, leave the vehicle undisturbed for at least an hour, then return with the correct code ready before making any entry.

Frequently Asked Questions

Is the Peugeot 307 code the same as the Citroën C4 code?

Not necessarily, even though both cars used the same RD4/RD43 units from Philips/VDO. The code is generated from the individual serial number of each unit, so two identically-specced radios will have different codes. Always use the serial from your specific unit.

The button combination did not show a serial — what should I do?

Try pressing and holding preset 1 and 6 instead of 1 and 4. The combination varies slightly between firmware versions. If neither works, remove the head unit with DIN keys and read the label directly.

My 307 has a navigation system — does it work the same way?

Some late 307s were optionally fitted with the Peugeot RT3 navigation unit. The RT3 uses a different serial format but still requires a code after power loss. The entry method is similar — use the preset buttons — but you should confirm the serial format on the label before ordering.

Can I get the code from a Peugeot dealer without the car?

Dealers typically need the VIN and the radio serial, and they may ask for proof of ownership. An online lookup using the serial number alone is faster and does not require you to visit a dealership.

Don't let a locked screen ruin your commute. Order your Peugeot 307 radio code now and have it in your inbox within minutes.