What is Consent Mode v2, and what do I lose in Google Ads without it?

Updated: 13 October 2026

The short answer

Consent Mode v2 is how your site tells Google tags what the visitor agreed to. Without it, Google does not know whether it may use the data, so remarketing lists and conversion measurement stop working for visitors from Europe.

What it actually is

Think of an interpreter between the consent window and the Google tags. The visitor clicks "accept" or "reject" in the window. Consent Mode turns that click into a message that Google Ads and Google Analytics understand.

It is not a consent window in itself. It shows nothing and asks nothing. It needs a window that collects the decision and then hands it over.

It mainly concerns the two products most small businesses use: Google Ads and Google Analytics. The same Google policy also covers AdSense, Ad Manager and AdMob, among others.

The "v2" stands for the version with four signals.

The four signals

ad_storage: whether advertising cookies may be stored.

analytics_storage: whether statistics cookies may be stored.

ad_user_data: whether the visitor's data may be sent to Google for advertising purposes.

ad_personalization: whether adverts may be tailored to this person, which includes remarketing.

Each signal is in one of two states: granted or denied. Before the visitor decides, all of them should be set to denied. After the decision they change to match what the visitor chose.

What you lose without it

Google says plainly that the consent state has to reach its tags. If it does not, two things stop working for visitors from the European Economic Area.

The first is remarketing lists. A small shop can no longer show an advert to someone who looked at a product and left without buying.

The second is conversion measurement. You do not know which campaign brought an order or a phone call from a customer. You spend money on adverts but cannot see which of them work.

Google's policy also says that if it is breached, the company may limit or suspend use of the product. In practice, the first thing you notice is empty audience lists and no conversions in your reports.

Where the requirement comes from

It is not a law but a condition of your agreement with Google. Google sets it because Google itself falls under EU rules for the largest internet companies. Under those rules it needs the visitor's consent before it uses, for advertising, data collected on other people's sites. So it requires you to collect that consent and pass it on.

The condition covers sites that use Google products and have visitors from the European Economic Area, the United Kingdom and Switzerland.

Microsoft does much the same. Without a consent signal, Microsoft Advertising stops recording conversions and updating remarketing lists, and Clarity runs without cookies in a reduced form.

A certified consent platform: who needs one

Talk about Consent Mode often brings up the phrase "Google-certified platform". That is a separate requirement and it covers a narrower group.

A certified tool is needed by publishers, meaning sites that earn money by showing adverts through AdSense, Ad Manager or AdMob. It does not apply to advertisers who only run Google Ads campaigns or measure traffic in Analytics.

So a hairdresser with a Google Ads campaign and a shop with Analytics need Consent Mode v2 but not the certificate. A blog carrying AdSense adverts needs both.

How to set it up and what to watch

Order matters most. The default denied state has to be set before any Google tag runs. If the consent window loads after Google Tag Manager, the tags start without being told "denied" and the whole arrangement fails.

The second point is agreement between the window and the signals. If the visitor rejects marketing and the advertising signal still shows granted, the setup is wrong, even if the reports look good.

This describes Google's policy and the rules. It is not advice on your particular case.

Consent Mode can be implemented by hand in the site's code. ConsentGate sets the four signals for you and checks that the script sits before the Google code.

Key points

Consent Mode v2 passes the decision from the consent window to Google tags. It asks nothing itself.
It has four signals, which should be set to denied before the visitor decides.
Without it you lose remarketing and conversion measurement for visitors from Europe.
Google certification concerns publishers using AdSense, Ad Manager and AdMob, not advertisers.

Sources

This guide is for information only and is not legal advice.