Consent Mode v2: what you lose if it's set up wrong
In the EU, a broken consent setup doesn't just risk compliance — it quietly removes conversions and audiences from your Google Ads.
Since March 2024, Google requires advertisers serving users in the EEA to send consent signals through Consent Mode v2. Without them, Google limits what it can do with your data: remarketing lists stop growing, and conversion measurement for those users gets much weaker.
Many sites have a cookie banner that looks fine but doesn't actually pass consent to Google tags. The banner works; the advertising quietly gets worse.
Basic vs advanced
- Basic: Google tags don't load at all until the user accepts. Nothing is sent for people who decline.
- Advanced: tags load with consent denied and send cookieless pings. Google can then model conversions for users who declined, within its privacy rules.
- Advanced usually recovers more conversion data — but the choice should be made together with whoever owns your legal and privacy decisions.
What we check
- The banner sends the four v2 signals: ad_storage, analytics_storage, ad_user_data and ad_personalization.
- Default consent state is set before any Google tag fires.
- Tags in GTM respect consent instead of firing on every page load.
- In Google Ads, the conversion diagnostics show consent signals being received.
The takeaway
A cookie banner isn't a consent setup. Check that the signals actually reach Google — it takes minutes and protects both data and compliance.
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