Ford C-Max Radio Code — Unlock It Online

A locked Ford C-Max radio is an almost inevitable consequence of changing the battery or disconnecting it for any reason. Ford's anti-theft system kicks in the moment power is removed, and the radio refuses to operate until the correct code is entered. The good news is that every C-Max radio — from the original 2003 C-Max I through to the final 2019 Grand C-Max — uses a serial-based code system that can be resolved quickly online.

Why the Ford C-Max Radio Locks

Ford OEM radios use a power-loss lock as a theft deterrent. The unit detects when its 12V feed is cut and stores a lock flag in memory. On the next power-up, it displays a code prompt and will not play until the correct 4-digit code is entered. Importantly, Ford C-Max radios use a permanent lockout system: after too many wrong attempts — typically around 5 to 10 — the unit locks completely and requires dealer intervention to reset.

C-Max radios are manufactured by Visteon, Sony, and Ford themselves, with models including the 6000 CD, 4500 RDS, Sony DAB, SYNC 1, SYNC 2, and SYNC 3. The serial number format uses a distinctive M- or V-code prefix.

Finding Your Ford C-Max Radio Serial Number

Ford's serial number system uses either an M-code or a V-code:

1. Display method (most reliable): Turn ignition to position II (or press the Start button without pressing the clutch/brake on newer models). With the radio on and showing the code prompt, press and hold preset buttons 1 and 6 simultaneously. The serial number scrolls across the display. On some C-Max models, try pressing 2 and 6 or the preset and seek buttons together.
2. Physical label: Remove the head unit using panel removal tools. The M- or V-serial is printed on a label on top of or behind the unit.

Once you have the full serial — including the M or V prefix — visit our Ford radio code lookup page to retrieve your unlock code.

Retrieving Your Code

Submit the serial at radiocodelookup.com. Our database covers the full C-Max range: C-Max I (2003–2007), C-Max II (2010–2015), C-Max II facelift (2015–2019), and the Grand C-Max (2010–2019). Your unique 4-digit code is emailed within minutes. This code is specific to your radio unit — it will not work in a different unit with a different serial.

Entering the Code on a Ford C-Max

1. Turn ignition to position II or start the vehicle.
2. Turn on the radio. The display shows a code prompt or dashes.
3. Use preset buttons 1, 2, 3 and 4 to cycle each digit to the correct number.
4. Press and hold preset button 5 (or the asterisk/star button on some models) to confirm the code.
5. The radio unlocks and resumes normal operation.

Critical warning: Ford C-Max radios use a permanent lockout after repeated wrong entries — unlike the temporary lockout found on many European brands. Once permanently locked, a dealer reset is required. Make sure you have the correct code before attempting entry.

C-Max Generations and Radios

Generation	Years	Typical Radio	Serial Format	Lockout Type
C-Max I	2003–2007	4000 RDS / 4500 RDS / 6000 CD	M / V prefix	Permanent (dealer)
C-Max II	2010–2015	6000 CD / Sony DAB / SYNC 1	M / V prefix	Permanent (dealer)
C-Max II facelift	2015–2019	6000 CD / SYNC 2 / SYNC 3	M / V prefix	Permanent (dealer)
Grand C-Max	2010–2019	6000 CD / Sony / SYNC 1/2	M / V prefix	Permanent (dealer)

Troubleshooting Error Messages

• Code prompt / dashes — Normal locked state; enter your 4-digit code.
• LOCKED 10 or LOCKED 13 — These codes indicate Ford SYNC or 6000 CD series lockout states. LOCKED 10 means 10 incorrect attempts and a permanent dealer-only lock; LOCKED 13 is a similar total lockout state. Stop entering codes immediately and contact a Ford dealer with V5 and purchase documentation.
• ERR — Wrong code on some Sony/6000 CD units; you may still have remaining attempts.

Frequently Asked Questions

What is the difference between an M-code and a V-code on a Ford C-Max?

Both are Ford radio serial number formats used by Visteon-manufactured units. The M-code (starting with M followed by six digits) and the V-code (starting with V followed by six digits) both work identically for code retrieval — just submit whichever one is on your unit's label or display. The algorithm used to generate the code is the same for both prefixes.

My Ford C-Max shows LOCKED 10 — is it permanently locked?

Yes. LOCKED 10 on a Ford 6000 CD or SYNC-series radio means the unit has received 10 incorrect code entries and has entered a permanent lockout state. There is no time-based reset. A Ford main dealer with the appropriate software (IDS or FDRS) can reset the unit, but this requires proof of ownership and the vehicle's V5C document. Avoid any further entry attempts.

Can I get the Ford C-Max radio serial number without removing the unit?

On most C-Max models fitted with a 6000 CD or 4500 RDS unit, holding presets 1 and 6 simultaneously while the code prompt is displayed will scroll the serial number across the screen. This avoids the need to remove the head unit. If this does not work on your specific variant, removal with a panel removal tool set is the alternative.

Does the Ford Grand C-Max use the same radio system as the standard C-Max?

Yes. The Grand C-Max (2010–2019) used the same Visteon/Sony/Ford head units — 6000 CD, Sony DAB, SYNC 1, and SYNC 2 — as the standard C-Max II. The serial format, code retrieval process, and entry method are identical across both vehicles.

Don't risk a permanent lockout by guessing codes. Get your Ford C-Max radio code the right way — enter your M or V serial number and receive the correct 4-digit code by email in minutes.