A Nissan radio asks for its security code after the head unit loses its permanent live feed — a flat battery, a battery change, a jump start or the radio being unplugged. The code is held against the serial number of that head unit, not against the registration or VIN. The serial normally looks like PP1234567. Check the handbook wallet and service book first — Nissan dealers often recorded the code. Once you have the serial, enter it in the radio code finder on this page.
Radio codes belong to the head unit serial number, not the vehicle registration or VIN.
A flat battery, battery replacement or radio removal is what triggers the code prompt.
Nissan serial formats: Clarion units (e.g. PP1234567); Bosch units (e.g. BP1234567); Renault-alliance units (e.g. K123).
Display messages: CODE = The security code is required. · Err / Error = Incorrect code entered. · LOC / LOCKED = Attempt limit reached. Leave the ignition on and the unit powered until the lockout clears.
Bob's never displays a guessed or generated code — if a working code can't be retrieved you get a full refund.
Where to find the serial number, what the display messages mean and how to key the code back in on a Nissan.
The Nissan radio code is a security code held against the head unit serial. It exists purely as theft deterrence, and because the unit holds the lock rather than the car, moving the radio between vehicles will not clear it.
When you'll be asked for the code:
After a flat battery or a battery replacement
Following accident repair where the dash was stripped
When a used unit is fitted from a breaker's vehicle
After a permanent-live fuse failure behind the glovebox
Serial number formats:
Clarion units — for example PP1234567. Serial usually starts PP or BP on the casing label.
Bosch units — for example BP1234567. Common on Qashqai and X-Trail.
Renault-alliance units — for example K123. Later Micra and NV200 may use a Renault-style short pre-code.
How to find the serial number:
Check the handbook wallet and service book first — Nissan dealers often recorded the code.
Most Nissan units need removing to read the serial: the fascia trim clips off, then four screws release the unit.
On a Qashqai the trim panel around the vents unclips by hand — work slowly with a plastic trim tool to avoid breaking the clips.
Read the label on the top of the casing and note both the serial and the supplier.
If the unit is Renault-branded internally, look for a PRE-CODE line rather than a long serial.
What the display messages mean:
CODE — The security code is required.
Err / Error — Incorrect code entered.
LOC / LOCKED — Attempt limit reached. Leave the ignition on and the unit powered until the lockout clears.
How to key the code in:
Use the preset buttons 1 to 4 to set each digit.
On units with a rotary control, turn to select and press to advance.
Confirm with the ENTER, OK or preset 5 button depending on the unit.
If the unit rejects the code, stop and re-check the serial before further attempts.
Do I have to remove my Nissan radio to get the serial? Usually yes. Unlike Ford, most Nissan head units do not display the serial on screen, so the casing label is the reliable source.
Is the Nissan code stored in the car? No. It belongs to the head unit. Nissan dealers often recorded it against the vehicle when new, which is why the handbook wallet is always worth checking.
My Micra looks like it has a Renault radio — which method applies? Later Micras and NV200 vans share Renault-alliance hardware. If the label shows a PRE-CODE line, follow the Renault approach instead of the Clarion one.
What if the label is unreadable? Photograph it in good light at an angle — faded thermal labels often still read under a raking light. If it is genuinely gone, the unit may need specialist reading.