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Changed Something on Your Vehicle? The CNV Form, Explained

The CNV is the form used to update a vehicle's own particulars on the register — when something about the vehicle itself has changed.

Engine number, colour, fuel type, body description, mass, transmission, number of wheels — if it's changed, the register needs to know. The form is explicit about one thing: complete only the particulars that have changed.

TrafficForms fills the CNV in for you from your own documents.

Fill my CNV now

Takes a few minutes · Your documents stay yours · Deleted after processing

What the CNV form is

CNV stands for Change of Particulars of / Notice in Respect of Motor Vehicle. It's not about who owns the car — that's the NCO. It's about the car itself.

The form captures the title holder or owner's details, the vehicle's identity (licence number, VIN, make, series), and then the particulars that have changed.

What it can change

The form lists the vehicle particulars it covers, including:

  • Vehicle category — motorcycle, light passenger, heavy passenger, light load, heavy load, special vehicle
  • Driven type — self-propelled, trailer, semi-trailer, trailer drawn by tractor
  • Vehicle description — sedan, hatchback, pick-up, chassis-cab, chassis, or other
  • Engine number (or "no engine")
  • Net power and engine capacity
  • Fuel type — petrol, diesel, or other
  • Tare and gross vehicle mass (GVM)
  • Number of wheels
  • Steering wheel position
  • Transmission — manual, semi-automatic, automatic, or none

What you'll need

  • Identification for the title holder or owner — the form notes that acceptable identification is essential, including that of a proxy or representative where an organisation is involved.
  • The vehicle's registration papers — the vehicle's identity details come from them.
  • The completed CNV form, with only the changed particulars filled in.
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How TrafficForms helps

Upload your ID and your vehicle's registration papers. TrafficForms reads them and completes the CNV — the title holder or owner's particulars and the vehicle's identity, placed in the right fields on the official form.

You then review it, fill in or adjust the particulars that have actually changed, preview it, and download it ready to print and sign.

Your source documents are deleted the moment they're read. Nothing is stored, and nothing is submitted on your behalf.

Where things tend to go wrong

  • Filling in everything. The form asks for only the particulars that have changed — not a full re-description of the vehicle.
  • Confusing it with the NCO. The CNV changes the vehicle's details. If the owner has changed, that's the NCO.
  • A company-owned vehicle. Identification for the proxy or representative is needed as well, not just the company's.

Frequently asked questions

What's the difference between the CNV and the NCO?

The CNV updates the vehicle's own particulars — engine, colour, body, mass. The NCO notifies a change of ownership. Different forms, different purposes.

Do I fill in the whole form?

No. The form states that only the particulars which have changed should be completed.

Does an engine swap need a CNV?

The form provides for a change of engine number, along with net power and engine capacity — so a change of engine is among the particulars it records.

What if the vehicle is in a company's name?

Acceptable identification is essential, including that of the organisation's proxy or representative.

Changing the owner, rather than the vehicle's details? See the NCO guide.

Registering a vehicle? See the RLV guide.

Fill my CNV now

Takes a few minutes · Your documents stay yours · Deleted after processing