Citroën Radio Code — C7 Barcode Guide

Your Citroën radio is showing CODE on the display — that happens any time the car loses battery power. The solution is straightforward: find your C7 barcode serial number and use it to recover the four-digit unlock code. This guide covers every common Citroën OEM radio fitted between 2002 and 2022, from the RD3 in an early C3 to the RT6 touchscreen in the C4 Picasso.

What Is the C7 Barcode and Where Is It?

Citroën OEM radios are identified by a barcode label whose format is called the C7 barcode. The serial number you need sits underneath this barcode — it typically looks like VF3XXXXXXXXXXXXXXX or a shorter alphanumeric string beginning with the unit's part code.

There are three places to look:

• On the radio unit itself — the label is on the top or side of the head unit. On older DIN-slot radios (RD3, RD4, RD45) you must remove the radio from the dashboard to read the label. A plastic trim removal tool costs a few pounds and the unit usually slides out once the clips are released.
• Glove box or service booklet — many Citroën dealerships placed a sticker with the serial and the code inside the glovebox lid or the vehicle handbook wallet.
• On-screen display (touchscreen models) — on the RD5 and RT6 units fitted to the C4 II (2010–2018) and C5 III, navigate to Settings → System → About. The serial number is listed there without removing the unit.

Once you have the serial, head to our radio code lookup to retrieve your unlock code instantly.

How to Enter a Citroën Radio Code

The entry method depends on which generation of unit you have.

Button-based units (RD3, RD4, RD45 — pre-2010)

1. Switch on the ignition so the radio displays CODE.
2. Use preset buttons 1–4 to select each digit in sequence. Button 1 cycles the first digit, button 2 the second, and so on.
3. Press the confirm button (often the right-arrow or a dedicated OK key) to submit the code.
4. The radio will display OK and resume normal operation.

Touchscreen units (RD5, RT6 — 2009 onwards)

1. The screen prompts you to enter a code using on-screen number buttons.
2. Tap each digit of your four-digit code in order.
3. Confirm the entry. The unit unlocks immediately.

Common Citroën Radio Models Overview

Radio Model	Typical Models / Years	OEM Supplier	Entry Method
RD3 / RD4	C2 (2003–2009), C3 I (2002–2009)	Philips/VDO	Preset buttons 1–4 + confirm
RD4 / RD45	C4 I (2004–2010), C3 II (2009–2016)	Bosch/Clarion	Preset buttons 1–4 + confirm
RD5 / RT6	C4 II (2010–2018), C5 III, DS3 (2009–2015)	Panasonic/Pioneer	On-screen keypad
CQ-JF10 (OEM)	C1 I/II (2005–2022), C-zero	Panasonic/Pioneer	Preset buttons 1–4

Troubleshooting: SAFE, WAIT, LOCKED and Error Codes

Entered the wrong code? Citroën radios apply a temporary lockout after a number of incorrect attempts.

• SAFE — the radio is locked and waiting. Switch the ignition off, leave it for at least one hour, then try again.
• WAIT or WAIT 1h — same as SAFE; the unit is timing out. Do not attempt any more entries until the display clears.
• CODE - - - - — normal prompt; you haven't made any wrong attempts yet, or the lockout period has expired.
• ERR — the code entered was incorrect. The counter has incremented. Double-check your serial number and retrieved code before trying again.

If the unit remains locked after extended waiting, verify that you are reading the correct label — some vehicles have had the radio replaced and the sticker in the glovebox no longer matches the installed unit.

Citroën Models and Radio Generations at a Glance

The table above covers the main pairings, but here is a broader overview of popular models:

• C1 I/II (2005–2022) — basic OEM unit, button entry
• C2 (2003–2009) — RD3/RD4, button entry
• C3 I/II/III (2002–2021) — RD3 through RD45, then RD5
• C4 I (2004–2010) — RD4/RD45
• C4 II (2010–2018) — RD5/RT6 touchscreen
• DS3 (2009–2015) — RD5/RT6

If you are unsure which radio is fitted, check the unit face for the model designation printed in small text at the bottom or top edge of the fascia.

Frequently Asked Questions

Why does my Citroën radio ask for a code after a battery change?

Citroën OEM radios store an anti-theft lock that activates whenever power is interrupted. Replacing or disconnecting the battery — even briefly — triggers the CODE prompt. The radio has not been damaged; it simply needs its four-digit code re-entered to verify the unit is still in the original vehicle.

Where is the serial number on an RD4 without removing the radio?

Unfortunately, on most RD4 units the label is on the top or side casing, so partial or full removal is needed. Use a pair of DIN release keys (or two flat-bladed tools) to depress the four clips holding the unit in the dash. The unit slides straight out. You can note the serial and slide it back in without disconnecting the wiring loom.

Can I find the serial number on the touchscreen without removing anything?

Yes — on RT6 and RD5 touchscreen units go to Settings → System → About. The Part Number and Serial fields shown there are what you need. No tools required.

My code was accepted but the radio still does not work. What now?

After a correct code entry the unit should play immediately. If it does not, check that the display shows OK (not ERR). A persistent blank screen after an accepted code can indicate a blown fuse in the fusebox — consult your vehicle handbook for the radio fuse location (typically fuse F6 or F26 on C3/C4 variants).

What if the serial number label is missing from my radio?

If the label has been removed or is unreadable, note down any part number visible on the unit casing and contact us via the brands page — in some cases the code can be recovered from VIN-linked dealer records or by cross-referencing the unit part number.